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Tamarisk is an invasive evergreen shrub native to arid regions of Africa and Eurasia and is considered a weed in some countries with dry climates. The complex of gall mites from tamarisks includes fourteen species from four genera of the family Eriophyidae. We reinvestigated the type species of the genus Dicruvasates, D. tamaricis from Egypt, described D. ngubani n. sp. from Tamarix usneoides from South Africa, and revised the generic concept of Dicruvasates. This genus possesses cuticular plates marking longitudinal opisthosomal ridges typical of various phyllocoptine genera, e.g., Echinacrus. We sequenced three genes of Dicruvasates and Phyllocoptes mites from Tamarix and Echinacrus from Frangula, combined our sequences with the data from GenBank, and performed single-gene phylogenetic analyses. All analyses inferred the following: (1) a transcontinental clade Tam comprising Dicruvasates + Aceria + Phyllocoptes from Tamarix; (2) Echinacrus distantly related to Dicruvasates, suggesting the homoplastic nature of the cuticular plates on the opisthosomal ridges, and (3) polyphyly of the genera Aceria and Phyllocoptes. We also investigated partially cleared specimens of Dicruvasates under CLSM and, for the first time, visualized a well-developed anal secretory apparatus (ASA) in the immatures of gall mites, which was previously shown to be a specialized system evolved in Eriophyoidea for silk production. We hypothesize that the ASA contributes to finding nymphs by conspecific males and advocate for the importance of the future molecular biology studies of gall mite silk for developing new methods for controlling mites based on the knowledge of their ecology, behavior, and silk gene genetics. [ABSTRACT FROM AUTHOR]

Effective ecological restoration requires empirical assessment to determine outcomes of projects, but conclusions regarding the effects of restoration treatments on the whole ecosystem remain rare. Control of invasive shrubs and trees in the genus Tamarix and associated riparian restoration in the American Southwest has been of interest to scientists and resource managers for decades; dozens of studies have reported highly variable outcomes of Tamarix control efforts, as measured by a range of response variables, temporal and spatial scales and monitoring strategies. We conducted a literature search and review, meta-analysis and vote count (comparison of numerical outcomes lacking reported variances and/or sample sizes) on published papers that quantitatively measured a variety of responses to control of Tamarix. From 96 publications obtained through a global search on terms related to Tamarix control, we found 52 publications suitable for a meta-analysis (n = 777 comparisons) and 63 publications suitable for two vote counts (n = 1,460 comparisons total; 622 comparisons reported as statistically significant) of response to Tamarix control. We estimated responses to control by treatment type (e.g. cut-stump treatment, burning, biocontrol) and ecosystem component (e.g. vegetation, fauna, fluvial processes). Finally, we compared results of the various synthesis methods to determine whether the increasingly stringent requirements for inclusion led to biased outcomes. Vegetation metrics, especially measures of Tamarix response, were the most commonly assessed. Ecosystem components other than vegetation, such as fauna, soils and hydrogeomorphic dynamics, were under-represented. The meta-analysis showed significantly positive responses by vegetation overall to biocontrol, herbicide and cut-stump treatments. This was primarily due to reduction of Tamarix cover; impacts on replacement vegetation were highly variable. We found concordance amongst our varied synthesis approaches, indicating that increased granularity from stricter quantitative techniques does not come at the cost of a biased sample. Overall, our results indicate that common control methods are generally effective for reducing Tamarix, but the indirect effects on other aspects of the ecosystem are variable and remain understudied. Given that this is a relatively well-studied invasive plant species, our results also illustrate the limitations of not only individual studies, but also of reviews for measuring the impact of invasive species control. We call on researchers to investigate the less commonly studied responses to Tamarix control and riparian restoration including the effects on fauna, soil and hydrogeomorphic characteristics. [ABSTRACT FROM AUTHOR]

Tamarix is native to Eurasia plus the northern and southern territories of Africa, with some species being introduced into America and Oceania. They are usually found in arid, desertic, or subdesertic areas, often on saline or subsaline soils, in Mediterranean, temperate, or subtropical climates. The genus is renowned for its complex taxonomy, which is usually based on rather variable or unstable characters, which leads to contrasting taxonomic treatments. As part of the taxonomic revision of Tamarix undertaken by the authors, ten names (i.e., T. africana, T. bounopoea, T. brachystylis var. fluminensis, T. malenconiana, T. muluyana, T. tenuifolia, T. tingitana, T. trabutii, T. valdesquamigera, and T. weyleri) published from material collected in the southwestern parts of the Mediterranean basin are taxonomically and nomenclaturally discussed after analysing their original material. Eight intended holotypes are corrected here to lectotypes; one epitype is designated for T. africana to warrant current use of the name; and one isotype, 30 isolectotypes, and 11 syntypes are also identified for the studied names. Further, the taxonomic identity of all names and their eventual synonymic placement are accordingly discussed. [ABSTRACT FROM AUTHOR]

The genus Obdulia Pritchard and Baker is reported for the first time from Saudi Arabia based on O. neotamaricis sp. nov. collected from galls on Tamarix aphylla (L.) Karst. (Tamaricaceae). The new species is described and illustrated from the adult female and male specimens. Obdulia daadi Al-Gboory, also collected from T. aphylla leaves, is re-described and illustrated based on both sexes, recorded for the first time from Saudi Arabia. Both Obdulia species were associated with the predatory mites, Molothrognathus sp. (Caligonellidae) and Paragigagnathus sp. (Phytoseiidae). The geographic distribution, hosts and a key to all known species of Obdulia are also given. [ABSTRACT FROM AUTHOR]

DNA barcoding allows the identification of an organism by comparing the sequence of selected DNA regions (barcodes) with a previously compiled database, and it can be useful for taxonomic identification of species in complex genera, such as Tamarix. Many species of this genus show convergent morphology, which leads to frequent errors in their identification. Highly variable genetic markers, such as microsatellites or short sequence repeats (SSR), could be used to differentiate species where DNA barcodes fail. Here, we tested the ability of both, 5 different marker regions (rbcL, matK, ITS, trnH‐psbA, and ycf1), and 14 microsatellites, to properly identify Tamarix species, especially those from the Mediterranean Basin, and compared the pros and cons of the different analytical methods for species identification. DNA barcoding allows the genetic identification of certain species in Tamarix. The two‐locus barcodes matK + ITS and ITS + ycf1 were the best‐performing combinations, allowing up to 69% and 70%, respectively, correct identification. However, DNA barcoding failed in phylogenetically close groups, such as many Mediterranean species. The use of SSR can aid the identification of species, and the combination of both types of data (DNA barcoding and SSR) improved the success. The combination of data was especially relevant in detecting the presence of hybridization processes, which are common in the genus. However, caution must be exercised when choosing the clustering methods for the SSR data since different methods can lead to very different results. [ABSTRACT FROM AUTHOR]

The genus Tamarix includes several plant species well-known for their medicinal properties since ancient times. Tamarix stricta Boiss is a plant native to Iran which has not been previously investigated regarding its phytochemical and biological properties. This study assessed phytochemical and toxicological aspects of T. stricta. The plant was collected from Kerman province of Iran and after authentication by botanist, it was extracted with 70% ethanol. Total phenolic compounds, total flavonoids, and antioxidant properties were measured using spectrophometric methods. Quercetin content of the extract was measured after complete acid hydrolysis with high-performance liquid chromatography. The phytochemical profile of the extract was provided using liquid chromatography-mass spectrometry method. Acute toxicity study with a single intragastric dose of 5000 mg/kg of the extract and sub-chronic toxicity using 50, 100, and 250 mg/kg of the extract was assessed in Wistar rats. Phytochemical analysis showed that polyphenols constitute the major components of the extract. Also, the extract contained 1.552 ± 0.35 mg/g of quercetin. Biochemical, hematological, and histological evaluations showed no sign of toxicity in animals. Our experiment showed that T. stricta is a rich source of polyphenols and can be a safe medicinal plant. Further pharmacological evaluations are recommended to assess the therapeutic properties of this plant. [ABSTRACT FROM AUTHOR]

Invasive species are a major cause of biodiversity loss worldwide, but their impact on communities and the mechanisms driving those impacts are varied and not well understood. This study employs functional diversity metrics and guilds—suites of species with similar traits—to assess the influence of an invasive tree (Tamarix spp.) on riparian plant communities in the southwestern United States. We asked: (1) What traits define riparian plant guilds in this system? (2) How do the abundances of guilds vary along gradients of Tamarix cover and abiotic conditions? (3) How does the functional diversity of the plant community respond to the gradients of Tamarix cover and abiotic conditions? We found nine distinct guilds primarily defined by reproductive strategy, as well as growth form, height, seed weight, specific leaf area, drought and anaerobic tolerance. Guild abundance varied along a covarying gradient of local and regional environmental factors and Tamarix cover. Guilds relying on sexual reproduction, in particular, those producing many light seeds over a long period of time were more strongly associated with drier sites and higher Tamarix cover. Tamarix itself appeared to facilitate more shade-tolerant species with higher specific leaf areas than would be expected in resource-poor environments. Additionally, we found a high degree of specialization (low functional diversity) in the wettest, most flood-prone, lowest Tamarix cover sites as well as in the driest, most stable, highest Tamarix cover sites. These guilds can be used to anticipate plant community response to restoration efforts and in selecting appropriate species for revegetation. [ABSTRACT FROM AUTHOR]

NAC (NAM, ATAF1/2 and CUC2) transcription factors play critical roles in plant development and abiotic stress responses, and aquaporins have diverse functions in environmental stress responses. In this study, we described the salt-induced transcriptional responses of ThNAC12 and ThPIP2;5 in Tamarix hispida , and their regulatory mechanisms in response to salt stress. Using yeast one-hybrid (Y1H), chromatin immunoprecipitation (ChIP) and dual-luciferase reporter assays, we identified that ThNAC12 directly binds to the NAC recognition sequence (NACRS) of the ThPIP2;5 promoter and then activates the ThPIP2;5 expression. Subcellular localization and transcriptional activation assays demonstrated that ThNAC12 was a nuclear protein with a C-terminal transactivation domain. Compared with the corresponding control plants, transgenic plants overexpressing ThNAC12 exhibited enhanced salt tolerance and displayed increased reactive oxygen species (ROS) scavenging capability and antioxidant enzyme activity levels under salt stress. All results suggested that overexpression of ThNAC12 in plants enhanced salt tolerance through modulation of ROS scavenging via direct regulation of ThPIP2;5 expression in T. hispida. • ThNAC12 is an upstream regulator and directly regulates ThPIP2;5 expression. • ThNAC12 is a nuclear localized protein with transactivation activity at C-terminal. • ThNAC12 enhanced salt tolerance by regulating ROS and antioxidant enzyme activity under salt stress. [ABSTRACT FROM AUTHOR]

A genus Tuponia is first reported to Korean fauna with a new species, Tuponia koreana Kim et Jung sp. nov. Morphological information such as the description and the diagnosis is presented with the photographs and the illustrations. A key for identification of Tuponia species from Fareast Asia is also provided. The host association of this genus and the implication for study of Tamarix introduced to Korean fauna are discussed. [ABSTRACT FROM AUTHOR]

To investigate the biosynthesis of silver nanoparticles (T-AgNPs) using leaf extract of Tamarix articulata and their possible role in attenuation of oxidative stress mediated human diseases. T-AgNPs were characterized by several biophysical techniques. Various health beneficial activities were also investigated. The synthesized T-AgNPs showed an absorption peak at 413 nm on UV-Visible spectroscopy indicating the surface plasmon resonance of the nanoparticles. TEM analysis clearly showed that particles were spherical with an average size of about 25 nm. SEM image analysis confirmed the spherical shape of T-AgNPs. T-AgNPs (600 µg/ml) showed effective DPPH scavenging (68.23%), ferric reducing (68.23%), and hydrogen peroxide reducing (70.09%) activities. Besides, T-AgNPs at 600 µg/ml, also showed strong anti-glycating, and AGEs formation inhibitory activities as indicated by reduced browning intensity (51.62%), aggregation index (48.86%), and cross amyloid structures (53.62%) as compared to positive controls (100%). A 600 µg/ml of T-AgNPs was found to have potent in vitro anti-inflammatory activity as revealed by albumin denaturation inhibition (73.19%), protease activity inhibition (70.196%), membrane stability against heat (74.16%), and hyposaline (72.98%) induced hemolysis as compared to controls. Altogether, these findings confirm that T-AgNPs can be promising candidates for the development of antioxidant, anti-inflammatory, membrane stabilizing, antiglycating and AGEs inhibitory agents. [ABSTRACT FROM AUTHOR]

The leaf beetle Diorhabda carinulata Desbrochers (Coleoptera: Chrysomelidae) was introduced into the United States in 1999 for classical biological control of the exotic woody invader saltcedar (Tamarix spp. L. [Caryophyllales: Tamaricaceae]). The recent southern expansion of the range of D. carinulata in the United States has precipitated conflict between proponents of biological control of Tamarix and those with concerns over habitat conservation for avian species. Several semiochemicals that mediate aggregations by this species have been reported, but no repellent compounds have been recorded thus far. We now report a repellent compound, 4-oxo-(E)-2-hexenal, induced by adult D. carinulata feeding on saltcedar foliage. Collection of headspace volatiles, gas chromatography mass spectrometry, and electroantennographic analyses identified 4-oxo-(E)-2-hexenal as an insect-induced compound that is antennally active. Behavioral and exposure assays were conducted to test for repellency and toxicity in adults and larvae. Headspace volatiles were also collected from adult males exposed to 4-oxo-(E)-2-hexenal to determine the impact exposure might have on the emission of the aggregation pheromone. 4-Oxo-(E)-2-hexenal elicited electrophysiological responses in adults of both sexes. Behavioral responses indicated repellency across multiple doses for reproductive D. carinulata adults but not in nonreproductive adults. Exposure assays indicated altered behaviors in first instar larvae and adults, but not in third instar larvae. Collection of headspace volatiles indicated that exposure to 4-oxo-(E)-2-hexenal did not alter emission of the D. carinulata aggregation pheromone by adult males. The continued development and field deployment of this repellent compound may provide a new tool for the management of D. carinulata. [ABSTRACT FROM AUTHOR]

Here, we studied the evolution of salt glands in 11 species of Tamarix and determined their role in adaptation to saline environments by measuring the effect of NaCl on plant growth and salt gland characteristics. Cluster analysis divided Tamarix species into three types (types I–III) according to salt‐gland characteristics. A phylogenetic tree based on ITS sequences indicated an evolutionary relationship consistent with the geographical distribution of Tamarix. We measured growth under different NaCl conditions (0, 100, 200, and 300 mM) for 40 days in three species (T. gallica, T. ramosissima, and T. laxa) representing the three Tamarix types. With increasing NaCl concentration, the biomass of all species was significantly reduced, especially that of T. gallica. Salt secretion ability and salt‐gland density showed similar trends in three types. The order of salt tolerance was type I > type II > type III. We conclude that during Tamarix adaptation to salinity, salt‐gland evolution followed two directions: one increasing salt‐gland density, and the other increasing salt secretion rate per salt‐gland. This study provides a basis for potential mechanisms of recretohalophyte adaptation to salinity. [ABSTRACT FROM AUTHOR]

The Iranian species of the genus Clinocentrus Haliday are reviewed. Clinocentrus amiri Rakhshani & Farahani sp. nov. is described and illustrated. The new species was collected exclusively using light traps and it is most probably a nocturnal species. It was found in association with Tamarisk forests around the Hamoon wetlands. A brief diagnosis is provided for the previously recorded species of Clinocentrus in Iran, with an illustration of their morphological characters, and the similarity of the new species to the genus Artocella van Achterberg is discussed. [ABSTRACT FROM AUTHOR]

Tamarix L. (Tamaricaceae) is a halophytic shrub in different parts of Asia and North Africa. Taxonomy and species limitation of Tamarix is very complex. This genus has three sections as Tamarix, Oligadenia, and Polyadenia, which are mainly separated by petal length, the number of stamens, the shape of androecial disk and attachment of filament on the androecial disk. As there was no palynological data on pollen features of Tamarix species of Iran, in the present study 12 qualitative and quantitative pollen features were evaluated to find diagnostic ones. Pollen grains of 8 Tamarix species were collected from nature. Pollen grains were studied without any treatment. Measurements were based on at least 50 pollen grains per specimen. Light and scanning electron microscopes were used. Multivariate statistical methods were applied to clarify the species relationships based on pollen data. All species studied showed monad and tricolpate (except some individuals of T. androssowii). Some Tamarix species show a high level of variability, in response to ecological niches and phenotypic plasticity, which make Tamarix species separation much more difficult. Based on the results of the present study, pollen grains features are not in agreement with previous morphological and molecular genetics about the sectional distinction. [ABSTRACT FROM AUTHOR]

Biological control of Tamarix spp. (tamarisk) with Diorhabda spp. (tamarisk beetle) was initiated in several states in the Western United States in 2001. We analysed 12 years of evapotranspiration (ET), net ecosystem production (NEP), and beetle abundance data from a tamarisk‐invaded site in Western Nevada along the Truckee River. Diorhabda carinulata (northern tamarisk beetle) appeared at the site in 2007. Large beetle outbreaks and associated defoliation of the tamarisk occurred in 2008 and 2009, then the beetle population was highly variable from year to year. Since 2016, the beetle population declined. Growing season ET noticeably declined from direct beetle herbivory in 2008, 2009, and 2010, but the decline in ET was seasonally transient as trees regrew leaves. In 2012 and 2013, total growing season ET was low, likely due to the combined effects of drought and beetle herbivory pressure. Total seasonal ET losses and NEP were primarily driven by annual precipitation with higher values in wetter years and reduced values when precipitation fell below 100 mm. In the last 2 years of the study, 2017–2018, there were few to no beetles observed at the site, and we measured increased tamarisk leaf area index, ET, and NEP. Since 2010 at the study site, no further releases of the beetles have occurred due to wildlife concerns, and subsequent declines in beetle populations where such that the "outbreak" conditions apparently required to impair tamarisk physiological function and significantly reduce ET have not occurred. ET and photosynthesis were highly correlated (r2 ≥.91) to the Landsat‐satellite normalized difference vegetation index (NDVI). Using a relationship between growing season ET and NDVI, we estimated ET for five additional tamarisk sites along several southwestern U.S. rivers. In the 2005 to 2018 analysis period, NDVI‐estimated ET declined at all sites after beetle arrival with three sites showing a recovery in pre‐beetle ET rates in subsequent years. At the other three sites, ET rates have not recovered to pre‐beetle levels. [ABSTRACT FROM AUTHOR]

This study, investigated the salt excretion efficiency and the level of the physiological response to salt-induced stresses between the native and exotic Tamarix species as well as their hybrids (Tamarix chinensis × Tamarix ramosissima and Tamarix chinensis × Tamarix usneoides). Ten potted plants from each of the five taxa were exposed to salt at a concentration of 3% (w/w) (180 mM) for 3 weeks. Measurements of electro-conductivity (EC), physiological parameters such as stomatal conductance, chlorophyll fluorescence, and water pressure and plant growth were taken from salt-treated and control plants. The EC in the exotic T. chinensis significantly increased by >30% compared with all other Tamarix taxa, suggesting that it is the most effective taxon for phytoremediation. Although there was no significant difference in plant growth between T. chinensis and T. usneoides, they both showed a significantly greater plant growth than the other taxa. However, the plant physiological parameters indicated that T. usneoides was less stressed by the salt exposure than the T. chinensis and the others. Thus, considering the T. usneoides greater tolerance to salt-induced and/water stresses and the strict environmental regulations of planting exotic Tamarix, the native Tamarix remains the preferred plant of choice for phytoremediation in South Africa. [ABSTRACT FROM AUTHOR]

Tamarix spp. (saltcedar) were introduced from Asia to the southern United States as windbreak and ornamental plants and have spread into natural areas. This study determined differential gene expression responses to water deficit (WD) in seedlings of T. chinensis and T. ramosissima from established invasive stands in New Mexico and Montana, respectively. A reference de novo transcriptome was developed using RNA sequences from WD and well-watered samples. Blast2GO analysis of the resulting 271,872 transcripts yielded 89,389 homologs. The reference Tamarix (Tamaricaceae, Carophyllales order) transcriptome showed homology with 14,247 predicted genes of the Beta vulgaris subsp. vulgaris (Amaranthaceae, Carophyllales order) genome assembly. T. ramosissima took longer to show water stress symptoms than T. chinensis. There were 2068 and 669 differentially expressed genes (DEG) in T. chinensis and T. ramosissima, respectively; 332 were DEG in common between the two species. Network analysis showed large biological process networks of similar gene content for each of the species under water deficit. Two distinct molecular function gene ontology networks (binding and transcription factor-related) encompassing multiple up-regulated transcription factors (MYB, NAC, and WRKY) and a cellular components network containing many down-regulated photosynthesis-related genes were identified in T. chinensis, in contrast to one small molecular function network in T. ramosissima. [ABSTRACT FROM AUTHOR]

Tamarix L. play important role in preventing deforestation in Iran. Tamarix species exhibit wide range of morphological variation therefore, the species delimitation become difficult. This is further complicated due to similarity of morphological characters in closely related species and the occurrence of inter-specific hybridization. The present study was performed to identify Tamarix species and their potential hybrids in Semnan Province of Iran. We used ITS and ISSR and 42 morphological characters for our investigation. Molecular phylogeny of the studied species and their relationship was not in agreement with the species tree of morphological characters and with taxonomic treatment of the genus. HGT tree of ITS and morphological data obtained revealed the occurrence of inter-specific hybridization or introgression between Tamarix species. [ABSTRACT FROM AUTHOR]

The genus Tamarix is a medium-sized genus of the Old World with about 54 species. Tamarix species can play an important role in preventing deforestation in Iran. We have no detailed information on Tamarix species, their inter-specific hybrids and the number of intra-specific forms growing in these regions. Therefore, the present work considers morphological and molecular study of the Tamarix taxa growing in three provinces of 1. Chaemahal-o-Bakhteyari, 2. Kerman, and 3. Southern Khorasan for the first time to answer the above mentioned questions and also aimed to produce data on population genetics and population divergence in T. mascatenses that has wider distribution in the studied areas. We identified six species in these provinces based on both morphological and ITS sequences. These species were also delimited by UPGMA tree of morphological characters. Phylogenetic analyses produced three major clades with high bootstrap values (>80.00). HGT tree revealed the occurrence of gene flow between T. meyeri and T. tetragyna, and between T. meyeri and T. stricta. Population genetic study of eight populations in T. mascatensis by SRAP and morphological analyses separated almost all populations in distinct clusters, revealing their genetic and morphological divergence. STRUCTURE plot revealed population genetic fragmentation in T. mascatensis. [ABSTRACT FROM AUTHOR]

This report summarises efforts to establish Diorhabda carinulata (Desbrochers) and D. elongata (Brullé) in California for the control of invasive saltcedars (Tamarix spp.), which degrade riparian ecosystems in the western United States. Over 14,000 D. carinulata individuals were released in California among four locations between 1999 and 2002 but beetles only established at the Tinemaha Reservoir site, the most eastern release location. More than 236,000 D. elongata individuals were released between 13 sites from 2003–2009 and establishment was limited to two sites, along the Cache and Pope creeks in northwestern California. The D. carinulata population did not disperse beyond the release area despite the presence of nearby (ca. 20 km) patches of the host plant. In contrast, D. elongata spread along Cache Creek and branches of related tributaries within the same watershed at ca. 14 km per year. A survey of 122 Tamarix stands across 15 California counties revealed that neither introduced beetle colonised other host patches, including those in neighbouring watersheds. Despite exclusive use of T. parviflora for ca. 36 generations, field collected D. elongata adults demonstrated strong preferences for T. ramosissima over T. parviflora when selecting both resting and ovipositional sites in caged choice tests. The proportion of D. elongata ovipositing on T. parviflora varied over time but with no clear trend of shifting host preference despite strong selection pressure. Explanations for the limited establishment and spread of Diorhabda spp. as well as impact to the target weeds are discussed. [ABSTRACT FROM AUTHOR]

The generic diagnosis of Bursaustium Haitlinger, 2000 is modified and Bursaustium zabolensis Noei sp. nov. (Acari: Trombidiformes: Erythraeidae) collected from soil samples (off host) under tamarisk trees in Zabol city, Sistan and Baluchestan province, Iran, is described. It is the third known species of the genus and second species of this genus from Iran. A key to species of Bursaustium (larva) is also provided. Bursaustium zabolensis Noei sp. nov. تغییر داده میشود و گونۀ Bursaustium Haitlinger, مشخصات جنس 2000 از نمونه خاك (بدون میزبان) زیر درختان گز از شهر زابل، استان سیستان و (Acari: Trombidiformes: Erythraeidae) بلوچستان، ایران توصیف میشود. این سومین گونۀ شناخته شده این جنس و دومین گونۀ این جنس از ایران است. کلید لارو) نیز ارایه میشود.) Bursaustium شناسایی گونههاي جنس [ABSTRACT FROM AUTHOR]

Two new species of the genus Raphignathus Dugès (Acari: Raphignathidae); R. hamooniensis sp. nov., and R. tamaricis sp. nov., are described based on adult female specimens associated with salt seder trees (Tamaricaceae: Tamarix aphylla L.) in the Sistan region, Sistan and Baluchestan province, southeast Iran. [ABSTRACT FROM AUTHOR]

The genus Tamarix (Tamaricaceae) is a lineage of shrubs and trees with leaves reduced to scales and numerous species adapted to moist and often saline soils in arid and semi-arid climates. Extensive morphological variation and hybridization complicate species delimitation and identification. Based on both morphological and DNA sequence characters, Tamarix humboldtiana Akhani, Borsch & N. Samadi is described as a new species from S Iran. Phylogenetic analysis of plastid rpl16 intron and trnG-trnS spacer sequences depicts a sister group relationship of its unique plastid haplotype to T. tetrandra, whereas nuclear ITS sequence data show close affinities to T. kotschyi. The new species differs from T. kotschyi by distinctly pedicellate, 5-merous flowers and vaginate-amplexicaul leaves. The stem and foliar anatomy and the epidermal micromorphology provide additional characters differentiating the new species from T. kotschyi. The gametic chromosome number of n = 12 reflects that of most of other species of the genus. Tamarix humboldtiana is a rare species living at freshwater riversides in S Iran and is according to current knowledge critically endangered. Citation: Akhani H., Samadi N., Noormohammadi A. & Borsch Th. 2019: A new species of Tamarix (Tamaricaceae) from Hormozgan Province, S Iran, supported by morphology and molecular phylogenetics. – Willdenowia 49: 127–139. doi: https://doi.org/10.3372/wi.49.49113 Version of record first published online on 17 April 2019 ahead of inclusion in April 2019 issue. [ABSTRACT FROM AUTHOR]

A new vagrant phyllocoptine species, Phyllocoptes bilobospinosusn. sp. (Eriophyidae, Phyllocoptinae), found on tamarisks (Tamarix tetrandra Pallas, T. smyrnensis Bunge, T. ramossisima Ledeb) in Donbass (Ukraine), Crimea, and USA is described based on conventional light microscopy and confocal laser scanning microscopy. Apart from two distinct areas of ventral cuticle bearing large, spike-like microtubercles, the new species possesses a thin translucent supracapitular plate (situated below the frontal lobe of the prodorsal shield), a short longitudinal ventral ridge anterior to the anal lobes, and unusual internal tube-like structures associated with the rectum. Careful examination of purposefully made slide mounts of partially cleared specimens revealed that adults of P. bilobospinosus possess a complex of structures associated with the rectum, including a hypertrophied, four-lobed putative anal gland and four thin tubes connected with a rectal sac. Similar tubular structures previously described in aberoptine mites of the genus Aberoptus from Brazilian Cesalpiniaceae are discussed. The synonymy of genera Aberoptus Keifer and Aceria Keifer is rejected and a new combination, Aberoptus inusitatus (Britto & Navia (in Britto et al. 2008)) n. comb., is proposed. A brief review of the anal glands of Eriophyoidea is given, including a discussion on homology and the variety of forms of the anal secretory apparatus among eriophyoid genera. Further research is needed on the anatomy of anal glands in Eriophyoidea, including transmission electron microscopy based histological analyses and additional studies of eriophyoids with well-developed secretory structures associated with the rectum. These methods will lead to a much better understanding of the evolution and homology of the anal secretory apparatus, which may render it useful for future phylogenetic studies. [ABSTRACT FROM AUTHOR]

The aerodynamic roughness length (z0m) is an important parameter that affects the momentum and energy exchange between the earth surface's and the atmosphere. In this paper, the gradient wind speed data that were observed from May to October, 2014, at the Si Daoqiao station, which is located in an area of sparse Tamarix in the downstream region of the Heihe River Basin (HRB), are used to evaluate the sensitivity of the moderate-resolution imaging spectroradiometer (MODIS) near-infrared (NIR) bi-directional reflectance distribution function (BRDF) R, the MODIS/Landsat 8 normalized difference vegetation index (NDVI), and the wind speed at 5 m in comparison with the field-measured z0m. The results indicate that the NIR BRDF_R_MODIS and the NDVIMODIS/NDVILandsat8 are less sensitive indicators of the z0m over sparse Tamarix areas (R2: 0.0045 for NIR BRDF_RMODIS; R2: 0.0342 for NDVIMODIS; and, R2: 0.1646 for NDVILandsat8), which differs significantly from the results obtained by previous studies for farmlands and grasslands. However, there is a nearly linear correlation between the wind speed at 5 m and the z0m at the time scale of the NDVILandsat8 acquisitions (R2: 0.3696). Furthermore, the combination of the NDVI and wind speed at 5 m can significantly improve this correlation (R2: 0.7682 for NDVIMODIS; R2: 0.6304 for NDVILandsat8), whereas the combination of the NIR BRDF_RMODIS and wind speed at 5 m still has a low correlation (R2: 0.0886). Finally, the regional z0m of the oasis in the downstream region of the HRB was determined using Landsat 8 surface reflectance data and the wind speed data at the Si Daoqiao station, which properly reflect the temporal evolution of the z0m in that region. The parameterization scheme proposed in this paper has great potential to be applied to evapotranspiration, land surface, and hydrologic model simulations of sparse Tamarix at Si Daoqiao site in the future. [ABSTRACT FROM AUTHOR]

Ornativalva (Lepidoptera: Gelechiidae) is an Old World genus known to be associated with the plant genus Tamarix (Angiosperm: Tamaricaceae) which was introduced to North America and became widely distributed in the Southwestern United States. Ornativalva erubescens, introduced from the Old World, is reported from the Southwestern United States. Ornativalva erubescens is redescribed. Adults and male and female genitalia are illustrated. [ABSTRACT FROM AUTHOR]

We describe a combined geoarchaeological and archaeobotanical approach applied to the study of firing activities that have been carried out at Fewet, a Garamantian compound in the Central Sahara (Libya), between the 3 rd century BC and the 1 st century AD. The archaeological stratigraphy of the site has been sealed by several mud-brick wall collapses, preserving an interesting sequence of living floors, whose micromorphological study is unique for the Central Sahara. This investigation together with the mineralogical analysis of sediments, confirms the field attribution of archaeological features as domestic fireplaces, and identified the living floors as areas devoted to animal penning, probably subjected to periodical firing. The investigation also highlights an exceptional concentration of gypsum pedofeatures, presumably determined by the wood type selected for fuel. The archaeobotanical study identified a good quantity of charcoal and other plant remains in the same layers. Most of the charcoal has been identified as Central Tamarix , which is the most common tree living in the oasis today. This suggests that tamarisk wood was the most exploited tree for fuel, and its combustion led to the dispersion of gypsum from the plant tissue, later recrystallized in the shape of microcrystalline nodules, lenses, and euhedral crystals. [ABSTRACT FROM AUTHOR]

Drastic alterations to river hydrology, land use change, and the spread of the nonnative shrub, tamarisk ( Tamarix spp.), have led to the degradation of riparian habitat in the Colorado River Delta in Mexico. Delivery of environmental flows to promote native cottonwood ( Populus spp.) and willow ( Salix spp.) recruitment in human-impacted riparian systems can be unsuccessful due to flow-magnitude constraints and altered abiotic–biotic feedbacks. In 2014, an experimental pulse flow of water was delivered to the Colorado River in Mexico as part of the U.S.-Mexico binational agreement, Minute 319. We conducted a field experiment to assess the effects of vegetation removal, seed augmentation, and environmental flows, separately and in combination, on germination and first-year seedling establishment of cottonwood, willow, and tamarisk at five replicate sites along 5 river km. The relatively low-magnitude flow deliveries did not substantively restore natural fluvial processes of erosion, sediment deposition, and vegetation scour, but did provide wetted surface soils, shallow groundwater, and low soil salinity. Cottonwood and willow only established in wetted, cleared treatments, and establishment was variable in these treatments due to variable site conditions and inundation duration and timing. Wetted soils, bare surface availability, soil salinity, and seed availability were significant factors contributing to successful cottonwood and willow germination, while soil salinity and texture affected seedling persistence over the growing season. Tamarisk germinated and persisted in a wider range of environmental conditions than cottonwood and willow, including in un-cleared treatment areas. Our results suggest that site management can increase cottonwood and willow recruitment success from low-magnitude environmental flow events, an approach that can be applied in other portions of the Delta and to other human-impacted riparian systems across the world with similar ecological limitations. [ABSTRACT FROM AUTHOR]

A palynological and multivariate study of six species of Tamarix L. distributed in Egypt was carried out. Pollen morphology was examined by Light Microscope (LM) and Scanning Electron Microscope (SEM). The systematic study of these species was conducted by means of numerical analysis using UPGMA clustering and PCO analysis based on 33 morphological characters, including life form, vegetative parts, fruits, floral characters, seeds and pollen grains. Pollen grains were found to be monads, radially symmetrical, isopolar, small-sized and homocolpate. Tamarix nilotica can be easily separated from other taxa by its subprolate pollen shape. Two major clades were identified by multivariate analysis of morphological characters; one of them included three species, namely T. amplexicaulis, T. passerinoides and T. macrocarpa. Our results indicate that there is a wide range of morphological similarity among the species of section Polyadenia. The other clade included T. aphylla, T. tetragyna and T. nilotica from section Tamarix and section Oligadenia. [ABSTRACT FROM AUTHOR]

In 2015 and 2016 a survey was carried out on the parasitoids of leafhoppers (Hemiptera, Cicadomorpha) feeding on salt cedar trees (Tamarix spp.) growing around Hamoon Lake in the Sistan region (Iran). Among the collected material, a series of dryinid specimens belonging to Mirodryinus atlanticus Olmi, 1984 (Hymenoptera, Dryinidae, Bocchinae) was captured on branches of Tamarix aphylla (L.) Karst. and Tamarix stricta Boiss., infested by Opsius versicolor (Distant) (Hemiptera, Cicadellidae). The subfamily Bocchinae and the genus Mirodryinus Ponomarenko, 1972 are new records for Iran. Diagnostic characters and notes on the morphological variability of the newly collected specimens are presented and discussed. [ABSTRACT FROM AUTHOR]

Tamarix typically appears in arid and semiarid habitats that are characterised by a broad spectrum of soil salinity. Scarce data are available about the influence of salt on seed germination. The aim of this paper is to analyse the influence of salinity and the loss of viability over time on seed germination of three western Mediterranean autochthonous Tamarix species ( Tamarix africana , Tamarix boveana and Tamarix gallica ) plus the eastern Mediterranean allochthonous Tamarix parviflora . These species appear in non-saline to hypersaline ecosystems. Germination percentage and mean-time germination were calculated. In general, germination was higher at no salinity, whereas higher salinities delayed germination. Seed germination of T. africana dramatically dropped at 1% salinity (from 23.7% to 4.1%), whereas for T. boveana and T. parviflora , germination decreased at 6% salinity (from 95% to 42% and from 89% to 14%, respectively), though T. boveana still retained a high germination percentage. Seeds of T. gallica showed intermediate behaviour and no germination was recorded for 6% salinity. Seed germination is also influenced by the storage time. After 3 months, germination values notably decreased to almost zero (from 70.6% to 0% for T. gallica and from 89% to 8% for T. parviflora ), except for T. africana . In the latter case, 1 month was enough to reduce germination values (from 23.7% to 2%). The observed germination differences match with their presence or absence in different semiarid damp environments and point at a dramatic loss of viability over time. [ABSTRACT FROM AUTHOR]

Tamarix is a genus in family Tamaricaceae. The present study inferred phylogenetic trees for sixteen Tamarix species from China, whose status has remained unclear, using the nuclear internal transcribed spacer (ITS) region and four chloroplast DNA regions. Thirty ITS sequences from the GenBank database were added for expanded ITS analysis. The molecular phylogenies divide the Tamarix species into eight clades. Tamarix androssowii , T. gracilis , and T. laxa group together as a subclade closely related to T. gansuensis and T. elongata (clade A). Tamarix austromongolica , T. chinensis , T. hohenackeri , T. ramosissima , and T. sachensis cluster into clade B; T. karelinii from Gansu province is also in this clade. Tamarix leptostachya belongs to clade C, and one population of T. ramosissima from Gansu province is placed in this clade in the expanded ITS tree. Tamarix hispida groups with T. karelinii from Xinjiang province in clade D. Three putative T. hispida individuals from Gansu province and T. hispida from the US cluster into clade E. Finally, Tamarix arceuthoides , T. taklamakanensis , and T. aphylla form separate clades (F, G, and H, respectively). These molecular analyses are consistent with the current classification of certain Tamarix species based on morphological traits. [ABSTRACT FROM AUTHOR]

A tamarisk thrips, Liothrips reuteri (Bagnall) (Thysanoptera: Tubulifera), collected on Tamarix from Mandali (Diyala Province) is recorded from Iraq for the first time. This also represents the first record of the genus Liothrips Uzel for this country. A current checklist of the tubuliferan thrips from Iraq is provided. The new records increase the known tubuliferan thrips reported in Iraq to 12 species in 6 genera representing two subfamilies of the family Phlaeothripidae. Diagnostic morphological characters and the geographical distribution of the newly recorded thrips are given. [ABSTRACT FROM AUTHOR]

Tamarix trees are considered of particular interest for afforestation and reforestation of degraded areas prone to salinity and drought. In this study, a comparison of the performance and physiological responses of two species of Tamarix grown in saline and dried soils was carried out. Stem cuttings of T. aphylla and T. jordanis were collected from a location in the Negev desert and the plantlets obtained were subjected to four different soil treatments under semi-controlled conditions for 14 days. The treatments were: fresh water (C); salt (S: 150 mM of NaCl); drought (D: 50% field capacity); and a combined stress (DS: 150 mM of NaCl + 50% FC). Results showed a higher tolerance to salt stress of T. jordanis as compared with T. aphylla. The maintenance of high amount of cell carbohydrates, the high capacity of carbon assimilation and the active growth were considered as markers of salt tolerance in Tamarix spp. T. aphylla showed better performances in terms of growth and biomass production than T. jordanis in dry conditions. The high accumulation of sugars found in the leaves of T. aphylla under mild drought is considered a mechanism of acclimatization. The combined stress (salt+drought) lowered the performance of plants as compared to salt and drought stress applied alone. The possible role of the accumulation of proline observed in the leaves of both species under stressful conditions is discussed. [ABSTRACT FROM AUTHOR]

Diorhabda carinulata (northern tamarisk beetle) has been released in the western United States as a biological control agent for the invasive plant Tamarix spp. (tamarisk). A few studies have been conducted analysing the effects of beetle defoliation on tamarisk water consumption, but predefoliation and post-defoliation comparison based on field data is scarce. The question of whether beetles substantially alter tamarisk water consumption is still open for discussion. In this study, an eddy covariance station and groundwater monitoring well were installed in a tamarisk stand along the Virgin River near Mesquite, NV, in 2010 to observe the impacts of tamarisk defoliation on evapotranspiration (ET) and groundwater levels. ET was calculated using the eddy covariance method and the White method and supported by Landsat remote sensing estimates. Data collected in 2010 established a baseline since the beetles arrived at the site in late 2010 and started feeding on foliage causing tamarisk trees to turn to brown during 2011. Repeated defoliations in 2011 and 2012 show that post-defoliation ET values and magnitude of diurnal groundwater-level fluctuations decreased compared with the predefoliation values. Estimated annual ET and annual average daily groundwater fluctuations were reduced by 18% and 35%, respectively. However, the magnitude of effects of defoliation was dependent on the growth stage of tamarisk at the time of defoliation. Also, ET recovered within a month as tamarisk established new leaves. Results from this study suggest that long-term changes in ET are highly dependent on repeated defoliation occurrences over several years. [ABSTRACT FROM AUTHOR]

The influence of Tamarix chinensis on its immediate environment and soil health has not been explored, particularly with respect to diurnal and seasonal variations. Thus, the objectives of this study were to: 1. Determine the physiological relevance of excreted salts in improving plant carbon fixation properties, and 2. Investigate the relationship between functional plant traits and environmental variability. A field grown population of T. chinensis was, therefore, studied to characterize its life strategies. Results indicated the presence of excreted salts on leaves enhanced photosynthesis and water use efficiency. Though the extent of nocturnal transpiration was always higher than in the daytime in both washed and unwashed leaves, the unwashed leaves conserved water more efficiently. Precipitation during the period of rapid plant growth alleviated soil salinity and enhanced the availability of essential nutrients. Low temperature and increased soil salinity marked the end of the plant's growth season. Plant's selective secretion, i.e., increased excretion of toxic ions, was insufficient to restrict ion toxicity resulting in declined plant growth. A consistent soil C:N ratio indicated the maintenance of soil resilience in the presence of test species. Our data suggest that T. chinensis influences species diversity positively by improving soil and atmospheric properties. • The selective secretion of toxic ions from leaf avoided ion toxicity in Tamarix. • Ions on leaf surface supported to capture air water and reflect excessive light. • Removal of salt crystal from leaf disturbed carbon fixation capabilities of leaf. • Net transpiration rate was higher in night. • Soil salinity was decreased during the growing period of Tamarix. [ABSTRACT FROM AUTHOR]

Tamarix L. accessions were collected from Sistan and Baluchestan Province of Iran, covering an area of about 60 km located in the southeast of Iran. he present investigation was performed to study the genetic structure of Tamarix populations in this province and present some information about gene low among these populations. Forty-two tree specimens were randomly collected and studied for molecular and morphological diversity. Based on morphological descriptions we recognized 3 species that were confirmed by detailed morphometric and genetic analysis. he studied tree specimens were separated in 3 distinct clusters by UPGMA clustering and principal coordinate analysis and multidimensional scaling ordination methods. Clustering of molecular (ISSR) data showed some degree of genetic variation within each species. Similarly, STRUCTURE analysis and K-means clustering revealed some degree of genetic admixture among the studied accessions. NeighborNet and reticulograms revealed some degree of gene exchange among the studied populations. AMOVA and the Hickory test showed significant genetic differences of the studied populations and the Mantel test showed significant correlation between genetic distance and geographical distance of these populations. [ABSTRACT FROM AUTHOR]

Tamarix L. plants are tolerant to extreme environmental conditions and represent a resource for the recovery of marginal areas. The aim of this study is to develop a molecular method for species assignment and to characterize the genetic differentiation of Italian Tamarix populations. Blind sampling was performed and individuals were gathered without any regard for species identity from seven sites in Italy. If possible, flowers for species identification were collected, but 60% of samples remained unidentified. The genotypic profile of 17 microsatellite markers and a Bayesian statistical approach allowed the individuals to split among genetic entities rather than by their species identity. A clear assignment of Tamarix africana Poir. individuals was found, but this was not the case for Tamarix gallica L. and Tamarix canariensis Willd., whose individuals were clustered in a unique group ( T. gallica-like). In T. africana, the Bayesian analysis of the genetic structure pointed out the existence of a unique gene pool, whereas according to principal coordinates analysis (PCOA) and FST values, the populations from Lazio and Sardinia were more differentiated. All the analyses performed showed a differentiation between Sicily and peninsular Southern Italy in the T. gallica-like group. This study is the first to report the characterization of the natural genetic resources of Italian tamarisks and it suggests the absence of genetic differentiation between T. gallica and T. canariensis. [ABSTRACT FROM AUTHOR]

Habitat suitability maps are commonly created by modeling a species' environmental niche from occurrences and environmental characteristics. Here, we introduce the hyper-envelope modeling interface (HEMI), providing a new method for creating habitat suitability models using Bezier surfaces to model a species niche in environmental space. HEMI allows modeled surfaces to be visualized and edited in environmental space based on expert knowledge and does not require absence points for model development. The modeled surfaces require relatively few parameters compared to similar modeling approaches and may produce models that better match ecological niche theory. As a case study, we modeled the invasive species tamarisk ( Tamarix spp.) in the western USA. We compare results from HEMI with those from existing similar modeling approaches (including BioClim, BioMapper, and Maxent). We used synthetic surfaces to create visualizations of the various models in environmental space and used modified area under the curve (AUC) statistic and akaike information criterion (AIC) as measures of model performance. We show that HEMI produced slightly better AUC values, except for Maxent and better AIC values overall. HEMI created a model with only ten parameters while Maxent produced a model with over 100 and BioClim used only eight. Additionally, HEMI allowed visualization and editing of the model in environmental space to develop alternative potential habitat scenarios. The use of Bezier surfaces can provide simple models that match our expectations of biological niche models and, at least in some cases, out-perform more complex approaches. [ABSTRACT FROM AUTHOR]

Initial field releases of the saltcedar leaf beetle, Diorhabda carinulata Desbrochers, 1870 (Chrysomelidae), against saltcedars, Tamarix Linneaus, 1753 (Tamaricaceae) in North America were unsuccessful at sites where the target taxon was T. parviflora de Condolle, 1828 as opposed to the more widespread T. ramosissima Ledebour, 1829 and related forms. A series of field and greenhouse studies was conducted to determine the basis for these failures. Generally, T. parviflora was a suitable host for larval and adult development. Larval growth was not significantly affected by host species although developmental rate was slightly slower when fed T. parviflora vs. T. ramossisima; nitrogen enrichment had greater influence on growth than did host identity. Insect feeding impact to T. ramossisima outplanted to the field was initially three times greater than to matched T. parviflora plants, apparently as a consequence of adult oviposition preference. Subsequent larval migration from defoliated to green plants resulted in roughly equivalent defoliation of both hosts. Where the two Tamarix species co-occurred in northern Nevada, the 'preference' for T. ramossisima was apparent because it was consistently more heavily colonized, and utilization of T. parviflora declined as insect densities diminished. These results, and the lack of alternative explanations for establishment failures at T. parviflora sites (predation, developmental constraints, climate conditions), lead to the conclusion that such failures are based on host specificity as a consequence of adult behavioral avoidance of T. parviflora. They also suggest that risks to non-target plants both within the genus Tamarix (e.g., T. aphylla (Linneaus) Karsten, 1882) and in a related family (Frankeniaceae: Frankenia spp.) are low and should not delay program implementation. [ABSTRACT FROM AUTHOR]

The invasive tree, Tamarix sp., was introduced to the United States in the 1800s to stabilize stream banks. The riparian ecosystem adjacent to the middle Rio Grande River in central New Mexico consists of mature cottonwood ( Populus fremontii) gallery forests with a dense Tamarix understory. We hypothesized that Populus would compensate for reduced competition by increasing its water consumption in restored riparian plots following selective Tamarix removal, resulting in similar transpiration ( T) among stands. The northern study site included a Populus stand invaded by Tamarix (INVN) and a restored Populus-only stand (RESN), as did a southern site (INVS and RESS) approximately 80 miles south. At each site, 20 × 20-m plots were established where up to 16 stems were monitored throughout the 2004 growing season using thermal dissipation sapflow sensors. Populus sapflux rates were greater in restored stands, suggesting those trees compensated for understory removal by using more water. Sapflow was scaled to estimate stand-level T based on a quantitative assessment of sapwood basal area ( Asw) by species. Although exotic species represented 85 and 91% of the total stems in the invaded stands, it amounted to only 3% (INVS) and 4% (INVN) of the total Asw, contributing proportionately less to T compared to Populus. Our results indicate that removing Tamarix from the Populus understory in this riparian forest had a minimal impact on stand water balance. Riparian restoration of the type discussed herein should focus primarily on enhancing riparian health rather than generating water. [ABSTRACT FROM AUTHOR]

In this study, the additive effects of a late embryogenesis abundant ( LEA) gene and a basic leucine zipper ( bZIP) gene on salt and osmotic stress in Tamarix plants were analyzed. The constructs containing one or both of the LEA and bZIP genes were transformed into tobacco. Northern blot analysis showed the genes were overexpressed under the control of the CaMV 35S promoter in both dual and single gene-transgenic tobacco lines. The effects of salt and osmotic stress in transgenic tobacco plant were investigated. Following exposure to NaCl, mannitol, and PEG6000 stress, dual gene-transgenic lines showed higher seed generation and growth rates than single gene-transgenic lines and the wild-type. In response to NaCl stress, the dual gene-transgenic lines showed lower malondialdehyde and higher leaf chlorophyll content than single gene-transgenic lines and the wild-type. These results suggested that the co-expression of LEA and bZIP resulted in an additive enhancement of stress tolerance in dual gene-transgenic tobacco. [ABSTRACT FROM AUTHOR]

Abstract: The leaves of Tamarix, a salt-secreting desert tree, form an extreme niche that harbors a unique microbial community. In view of the global distribution of this tree, its island-like phyllosphere is highly suitable for studying microbial diversity along geographical gradients. Here we present an analysis of microbial community diversity using leaf surface samples collected at six different sites, on both sides of the Dead Sea, over a period of one year. Biodiversity analysis of denaturing gradient gel electrophoresis (DGGE) patterns of the bacterial 16S rRNA gene revealed a significant degree of bacterial community similarity within trees sampled at the same site, much higher than the similarity between trees from different geographical locations. Statistical analysis indicated that the degree of similarity was negatively correlated with the distance between sampling sites, and that a weak correlation existed between diversity and leaf pH. [Copyright &y& Elsevier]

Abstract: The success of riparian restoration projects in the arid southwestern U.S. is often measured in terms of vegetation characteristics such as growth, cover, and structure. Among low-elevation riverine environments within the Colorado River watershed, restoration is typically conducted to improve degraded habitats for birds of conservation concern by replacing the exotic tamarisk (Tamarix ramosissima) with native cottonwoods (Populus spp.) and willows (Salix spp.). The working assumption for many restoration practitioners is that replacing exotic plants with native plants will improve habitat quality and will, therefore, benefit birds. Based on data collected at exotic and restored (i.e., native) sites along the Las Vegas Wash, Nevada, not all birds benefit from restoration. Broad measures of community benefit, including benefits to birds of conservation concern and riparian obligate/dependent birds, were not detected. There were, however, some species-specific benefits. Some environmental variables that were associated with exotic and native sites were significant in explaining the composition of the bird community. For example, the richness of forbs and grass-like plants (a proxy of soil moisture), invertebrate mass, and percent shade (a proxy for canopy characteristics) were important. Considering our results and depending on restoration goals, tamarisk replacement projects may not inherently provide benefits to birds. [Copyright &y& Elsevier]

To explore the roles of plasticity and genetic variation in the response to spatial and temporal climate variation, we established a common garden consisting of paired collections of native and introduced riparian trees sampled along a latitudinal gradient. The garden in Fort Collins, Colorado (latitude 40.6°N), included 681 native plains cottonwood ( Populus deltoides subsp. monilifera) and introduced saltcedar ( Tamarix ramosissima, T. chinensis and hybrids) collected from 15 sites at 29.2-47.6°N in the central United States. In the common garden both species showed latitudinal variation in fall, but not spring, leaf phenology, suggesting that the latitudinal gradient in fall phenology observed in the field results at least in part from inherited variation in the critical photoperiod, while the latitudinal gradient in spring phenology observed in the field is largely a plastic response to the temperature gradient. Populations from higher latitudes exhibited earlier bud set and leaf senescence. Cold hardiness varied latitudinally in both fall and spring for both species. For cottonwood, cold hardiness began earlier and ended later in northern than in southern populations. For saltcedar northern populations were hardier throughout the cold season than southern populations. Although cottonwood was hardier than saltcedar in midwinter, the reverse was true in late fall and early spring. The latitudinal variation in fall phenology and cold hardiness of saltcedar appears to have developed as a result of multiple introductions of genetically distinct populations, hybridization and natural selection in the 150 years since introduction. [ABSTRACT FROM AUTHOR]

The article looks at the study to determine potential of paleartic tamarix leafhopper, Opsius stactogalus (O. stactogalus) in biologically controlling the excess growth of Tamarix species in Argentina. It mentions introduction of Tamarix in Argentina to control soil erosion, dunes and provide shade but its adverse effect due to invasion in Pampean grasslands has raised the need for preventing its growth. The article further informs about the insignificant damage caused to Tamarix by leafhopper.

Salt cedars (Tamarix) are invasive halophytic species and heavy water consumers. However, Tamarix possesses interesting characteristics accounting for its opportunistic and resilient abilities: analogous to a miniature photodesalinization machine, it thrives on saline soils toxic to most plants. Here we observe, document, and reveal the salt separation process of T. ramosissima. Specimens were cultivated under controlled artificial conditions, then analyzed by microscopic and spectroscopic techniques. Tamarix ramosissima is shown to produce varied morphologies of salt crystal aggregates from vesiculated trichomes and possess the ability to separate anions and cations. Sodium chloride, potassium chloride (KCl), and potassium sodium sulfate [K2.25Na1.75(SO4)2] were major exuded salt crystal phases, with smaller quantities of other phases present. Compositions of crystals exuded by individual plants were consistent with compositions of the soils they grew on. Although T. ramosissima may be an invasive nuisance, it may possess other worthwhile attributes such as the potential to be a viable phytoremediator and environmental indicator. [ABSTRACT FROM AUTHOR]

Ninety eight species of angiosperms belonging to 34 families were identified in the Wadi Allaqi Biosphere Reserve (S. E. Egypt): 33.7%annuals and 66.3%perennials. The members of Leguminosae contributed 19.4% of the total flora, considering the most dominant family in Wadi Allaqi. Three herbaceous species were recorded for the first time in this region: Iphiona scabra, Chenopodium album and Lotus deserti. Eight vegetation clusters were obtained and categorized into 4 distinct groups according to soil composition and chemical characteristics (concentration of bicarbonates, calcium, magnesium and chlorides), and intensity of inundation by the water of Lake Nasser. [ABSTRACT FROM AUTHOR]

Abstract: Populus–Salix forests are a valued riparian vegetation type in western North America. These pioneer, obligate phreatophytes have declined on some rivers, raising conservation concerns and stimulating restoration plantings, but have increased on others. Understanding patterns and causes of forest change is essential for formulating conservation, restoration and management plans. Our goal was to assess spatio-temporal patterns of vegetation change on the Upper San Pedro River in semiarid Arizona, USA, one of the few undammed rivers in the region. Over 100 years ago, intense floods initiated channel incision and substantially altered hydrogeomorphology. Pioneer trees began to establish in the widening post-entrenchment zone as the surfaces began to stabilize. Using a time-series of aerial photographs (1955–2003) we quantified recent change in area of riparian cover types. Analysis indicated that wooded area in the post-entrenchment zone nearly tripled from 1955 to 2003, at the expense of bare ground, and the active channel narrowed appreciably. This forest expansion represents a long-term response to river entrenchment, with the temporal pattern influenced by recent flood cycles and biogeomorphic feedbacks. Populus–Salix have established episodically during the infrequent years with high winter flood runoff, sequentially filling available recruitment space. Older cohorts cover wide swaths of the floodplain while young trees form narrow bands lining the channel. Barring extreme flooding, the pioneer forests are expected to senesce over the coming century. An additional factor that has shaped the pattern of post-entrenchment forest expansion is anthropogenic water withdrawal. Populus–Salix forest increase has been greatest within a conservation area, where stream flows are largely perennial. In drier, agricultural sectors, Populus–Salix have declined while the more deeply-rooted Tamarix has increased. Overall, the study reveals that long-term fluctuations in pioneer forest area and age structure are common on dryland rivers, and shows how past events such as extreme floods can interact with recent environmental practices such as freshwater withdrawal to influence riparian forest patterns. This underscores the necessity of a long-term perspective for forest conservation and management. [Copyright &y& Elsevier]

Abstract: Since its release in 2001 for the biological control of saltcedar (Tamarix spp., Tamaricaceae), the leaf beetle Diorhabda elongata (Brullé) from China and Kazakhstan, has become successfully established in many locations in the western United States. However, it failed to establish in the southern and western portions of the saltcedar infestation, creating the need to test additional populations of the beetle from other areas within its region of origin. The host specificity of seven Eurasian populations of D. elongata was evaluated by testing larval development and adult ovipositional preference on a variety of non-target agricultural, ornamental and native plants, with emphasis placed on native Frankenia spp. (Frankeniaceae), which were shown to be laboratory hosts in previous tests. No larvae survived on any of the non-target test plants except for Frankenia spp., where survival to the adult stage ranged between 15% and 92%, and was often not significantly different from survival on Tamarix controls. Adult Diorhabda from Crete laid significantly more eggs on Tamarix ramosissima Ledebour than on Frankenia spp. in a multiple-choice oviposition test but showed very little discrimination between Tamarix and Frankenia species in a no-choice test. In paired-choice tests, all seven Diorhabda populations laid significantly more eggs on T. ramosissima than Frankenia salina (Molina) I.M. Johnston. However, the percentage of total eggs laid on F. salina ranged from 0.8% to 15.7%, suggesting that some utilization of this native plant might occur in the field, despite the presence of a preferred host plant. Significant differences were found between some Diorhabda populations in the percent of total eggs laid on F. salina, indicating a variable degree of risk to these non-target plants. [Copyright &y& Elsevier]