26 results on '"Yan, Chongling"'
Search Results
2. Accumulation, distribution and toxicological effects induced by chromium on the development of mangrove plant Kandelia candel (L.) Druce
- Author
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Kazi Shakila Islam, Md. Motiur Rahman, Yan Chongling, and Mohammed Mahabubur Rahman
- Subjects
Chromium ,plant growth ,metal accumulation ,metal distribution pattern ,toxic effect ,mangrove ,Environmental sciences ,GE1-350 - Abstract
A study was performed for investigating accumulation, distribution and toxicological effects induced by chromium (Cr) on the development of the mangrove seedling Kandelia candel (L.) Druce. Seedlings treated with increasing concentrations of CrCl3 solution (0, 0.5, 1, 1.5, 2, 2.5, 3 mg L-1, respectively) were grown in a basic nutrient solution for three months. The five month old seedlings were harvested for the experiment. This study showed that Cr treatment significantly decreased growth of K. candel in terms of seedling height, leaf number and total biomass. At the highest 3 mg L-1 Cr exposure, there was a 34.47% decrease in final seedling height, 68.95% decrease in leaf number and a 60.65% decrease in total biomass. The present study demonstrates that Cr accumulation ability of K. candel seedlings increased with the increase of treatment strength up to certain level. The concentrations of Cr in root, hypocotyl, stem and leaf ranged from 22.87 to 1.43 mg kg-1, 1.30 to 0.68 mg kg-1, 2.42 to 0.91 mg kg-1, and 1.74 to 0.74 mg kg-1, respectively. When comparing Cr concentration in different plant parts with respect to their controls, the results showed that treated plant root bioaccumulated high amounts of Cr. Almost 80% of Cr was accumulated mainly in roots. The distribution pattern of Cr in K. candel was Root > Stem > Leaf > Hypocotyl. Our findings indicated that the high concentration of Cr supply may interfere with several metabolic processes of seedlings, causing toxicity to plants as exhibited by chlorosis, necrosis, and finally, plant death.
- Published
- 2009
- Full Text
- View/download PDF
3. Phosphorus and cadmium interactions in Kandelia obovata (S. L.) in relation to cadmium tolerance
- Author
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Du, Jingna, Yan, Chongling, and Li, Zhaodeng
- Published
- 2014
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4. The short-term effect of cadmium on low molecular weight organic acid and amino acid exudation from mangrove (Kandelia obovata (S., L.) Yong) roots
- Author
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Xie, Xiangyu, Weiss, Dominik J., Weng, Bosen, Liu, Jingchun, Lu, Haoliang, and Yan, Chongling
- Published
- 2013
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5. Accumulation and speciation of Cd in Avicennia marina tissues
- Author
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Du Daolin, Yan Chongling, Lu Haoliang, Li Jian, and Liu Jingchun
- Subjects
0106 biological sciences ,media_common.quotation_subject ,Species distribution ,chemistry.chemical_element ,Wetland ,Plant Science ,010501 environmental sciences ,Biology ,01 natural sciences ,Botany ,Environmental Chemistry ,0105 earth and related environmental sciences ,media_common ,Cadmium ,geography ,geography.geographical_feature_category ,Chemical speciation ,biology.organism_classification ,Pollution ,Plant Leaves ,Speciation ,Biodegradation, Environmental ,chemistry ,Avicennia marina ,Wetlands ,Avicennia ,Mangrove ,Water Pollutants, Chemical ,010606 plant biology & botany - Abstract
Avicennia marina is a high-Cd-tolerant species in the mangrove wetlands. A hydroponic experiment was carried out to research the accumulation and chemical form distribution of Cd in the tissues of A. marina under different concentrations and durations of Cd stress. It was found that the concentrations of Cd in plant tissues followed the order of rootstemleaf. The data suggested that root activity decreased, Cd accumulation ability weakened in roots, and the translocation factor increased in stems and leaves with the increase of stress duration. With a proactive defense mechanism, most Cd was bound to pectates, organic acids, and protein, especially in roots and stems with the most proportion of 88.51 and 78.91%, respectively, having lower biological activities. The Cd bounded to water-soluble organic acid and free inorganic aminophenol-Cd showed the lowest concentration. The pectates, organic acids, and protein-integrated Cd seem the most important in affecting Cd detoxification for A. marina; this mechanism of change in Cd biological activities decreases the toxicity of this aggressive pollutant and presents new knowledge about the tolerance of mangrove plants.
- Published
- 2017
6. The alleviation effect of iron on cadmium phytotoxicity in mangrove A. marina. Alleviation effect of iron on cadmium phytotoxicity in mangrove Avicennia marina (Forsk.) Vierh
- Author
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Yan Chongling, Lu Haoliang, Du Daolin, Liu Jingchun, and Li Jian
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Environmental Engineering ,Health, Toxicology and Mutagenesis ,Iron ,0208 environmental biotechnology ,chemistry.chemical_element ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Plant Roots ,Environmental Chemistry ,High activity ,Chelation ,0105 earth and related environmental sciences ,chemistry.chemical_classification ,Cadmium ,biology ,Public Health, Environmental and Occupational Health ,General Medicine ,General Chemistry ,biology.organism_classification ,Pollution ,020801 environmental engineering ,Bioavailability ,chemistry ,Avicennia marina ,Environmental chemistry ,Phytotoxicity ,Avicennia ,Mangrove ,Organic acid - Abstract
Cd has high activity and bioavailability and is a poisonous element to plants. As a critical ecosysterm, mangroves are subjected to serious Cd pollution. In this research, the hypothesis was presented that improving Fe bioavailability would alleviate Cd phytotoxicity to Avicennia marina (Forsk.) Vierh. To test this, we examined the effect of four exogenous Fe and three Cd concentrations on A. marina. The results showed that a significant positive correlation excited between moderate exogenous Fe concentration and Cd tolerance of A. marina. Moderate exogenous Fe concentration directly or indirectly promoted the formation of Fe plaque, which immobilised more Cd on the root surface and decreased Cd absorption in roots. Furthermore, an exogenous Fe application increased plant biomass and Fe accumulation in A. marina tissues. This improved the competition between Fe and Cd within the plants. Therefore, an Fe application facilitated a decrease in Cd toxicity within A. marina. Simultaneously, a moderate Fe concentration caused an increase in low-molecular-weight organic acid (LMWOA) secretion from the roots. Meanwhile, Cd can be chelated/complexed by LMWOAs. It also played a crucial role in Cd detoxification in A. marina. In conclusion, Fe application accelerated the growth and enhanced Cd tolerance of A. marina. Therefore, improving Fe bioavailability will protect mangroves from Cd contamination.
- Published
- 2018
7. Accumulation, distribution and toxicological effects induced by cadmium on the development of mangrove plant Kandelia candel (L.)
- Author
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Mohammed M. Rahman, Kazi Shakila Islam, Motiur Rahman, and Yan Chongling
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High concentration ,Cadmium ,chemistry.chemical_element ,Kandelia candel ,Biology ,biology.organism_classification ,Hypocotyl ,Horticulture ,chemistry ,Distribution pattern ,Botany ,Mangrove ,Leaf number ,General Environmental Science - Abstract
Accumulation and distribution pattern of cadmium (Cd) and its toxic effect on growth of the mangrove plant of young Kandelia candel seedlings have been examined. This study demonstrated that under high concentration of Cd stress, the total biomass of K. candel decreased 41.57% compare to control (CK). At the end of 90 days exposure to 25 mg/l Cd, the average seedlings stem height and leaf number of the K. candel decreased by 30.54 and 42.68%, respectively. The results showed that K. candel seedlings, under the experimental condition, accumulated higher concentration of Cd in their roots (411.29 ± 3.60 mg/kg) when compared to hypocotyls, stems and leaves. More than 95% of Cd was accumulated mainly in roots. The distribution pattern of Cd concentration in K. candel seedlings was found in the following order: roots > hypocotyls > stems > leaves. Based on the leaf symptoms and morphological change of K. candel seedlings under heavy metal stress, this study showed that Cd is phytotoxic to K. candel.
- Published
- 2011
8. Accumulation, distribution and toxicological effects induced by chromium on the development of mangrove plant Kandelia candel (L.) Druce
- Author
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Mohammed Mahabubur Rahman, Yan Chongling, Md. Motiur Rahman, and Kazi Shakila Islam
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Hydrology ,Chromium ,lcsh:GE1-350 ,mangrove ,Land use ,business.industry ,Environmental resource management ,Public Health, Environmental and Occupational Health ,Geoprocessing ,food and beverages ,Land cover ,plant growth ,Aquatic Science ,Structural basin ,Natural resource ,metal accumulation ,Fragility ,Thematic map ,metal distribution pattern ,business ,Scale (map) ,lcsh:Environmental sciences ,General Environmental Science ,toxic effect - Abstract
A study was performed for investigating accumulation, distribution and toxicological effects induced by chromium (Cr) on the development of the mangrove seedling Kandelia candel (L.) Druce. Seedlings treated with increasing concentrations of CrCl3 solution (0, 0.5, 1, 1.5, 2, 2.5, 3 mg L-1, respectively) were grown in a basic nutrient solution for three months. The five month old seedlings were harvested for the experiment. This study showed that Cr treatment significantly decreased growth of K. candel in terms of seedling height, leaf number and total biomass. At the highest 3 mg L-1 Cr exposure, there was a 34.47% decrease in final seedling height, 68.95% decrease in leaf number and a 60.65% decrease in total biomass. The present study demonstrates that Cr accumulation ability of K. candel seedlings increased with the increase of treatment strength up to certain level. The concentrations of Cr in root, hypocotyl, stem and leaf ranged from 22.87 to 1.43 mg kg-1, 1.30 to 0.68 mg kg-1, 2.42 to 0.91 mg kg-1, and 1.74 to 0.74 mg kg-1, respectively. When comparing Cr concentration in different plant parts with respect to their controls, the results showed that treated plant root bioaccumulated high amounts of Cr. Almost 80% of Cr was accumulated mainly in roots. The distribution pattern of Cr in K. candel was Root > Stem > Leaf > Hypocotyl. Our findings indicated that the high concentration of Cr supply may interfere with several metabolic processes of seedlings, causing toxicity to plants as exhibited by chlorosis, necrosis, and finally, plant death.
- Published
- 2009
9. Short-term influence of nutrient availability on the uptake and translocation of phenanthrene in mangrove seedlings.
- Author
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Jiang, Shan, Liu, Jingchun, Lu, Haoliang, and Yan, Chongling
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NUTRIENT uptake ,PHENANTHRENE ,MANGROVE plants ,SEEDLINGS ,PLANT cells & tissues - Abstract
The uptake and distribution of phenanthrene, a typical polycyclic aromatic hydrocarbon, in plant tissues of Aegiceras corniculatum and Avicennia marina and the relationship with nutrient (nitrate, ammonium, and soluble reactive phosphorus) availability were investigated. After 12 h of exposure, enhancements in the concentration of nitrate and soluble reactive phosphorus markedly decreased the residual level of phenanthrene in roots, while the addition of ammonium significantly increased the residual concentration. Due to the similar enzymatic degradation potential between treatment groups, the variation of phenanthrene concentration in mangrove roots may result from the H
+ /phenanthrene cotransport at the root surface that was influenced by nutrient uptake. Moreover, both nitrate and soluble reactive phosphorus amendments significantly increased translocation of phenanthrene from roots to leaves, which likely resulted from the change of hydraulic conductivity in mangrove plants triggered by different nutrient availability. [ABSTRACT FROM AUTHOR]- Published
- 2018
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10. Exogenous phosphorus enhances cadmium tolerance by affecting cell wall polysaccharides in two mangrove seedlings Avicennia marina (Forsk.) Vierh and Kandelia obovata (S., L.) Yong differing in cadmium accumulation.
- Author
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Dai, Minyue, Liu, Wenwen, Hong, Hualong, Lu, Haoliang, Liu, Jingchun, Jia, Hui, and Yan, Chongling
- Subjects
PHYSIOLOGICAL effects of phosphorus ,MANGROVE plants ,AVICENNIA ,PLANT cell walls ,POLYSACCHARIDES ,PHYSIOLOGICAL effects of cadmium ,BIOACCUMULATION - Abstract
Phosphorous (P) is an essential element that mediates various stresses in plants. In this study, the effects of P on polysaccharides in the root cell walls of two hydroponically cultivated mangrove seedlings ( A. marina and K. obovata ) that differ in Cd accumulation ability were examined in the context of Cd stress. The results showed that A. marina exhibited a higher degree of tolerance to Cd than K. obovata . In both mangrove seedlings, pectin and hemicellulose 1 increased significantly with increasing P levels, the effects of which were greater in A. marina under Cd stress. In addition, cell wall pectin methylesterase (PME) activity was markedly increased in the presence of Cd and P compared with Cd alone. These effects were more pronounced in A. marina than in K. obovata . Taken together, the results of this study provide further insight into the mechanisms of P-mediated alleviation of Cd stress in mangrove seedlings. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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11. Distribution correlations of cadmium to calcium, phosphorus, sodium and chloridion in mangrove Aegiceras corniculatum root tissues.
- Author
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Li, Jian, Yu, Junyi, Yan, Chongling, Du, Daolin, Liu, Jingchun, and Lu, Haoliang
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MANGROVE plants ,CADMIUM poisoning ,EFFECT of metals on plants ,PHYTOGEOGRAPHY ,PLANT anatomy - Abstract
Nutriment distributions might influence Cd distribution and Cd tolerance in mangrove plant roots. To demonstrate this, Aegiceras corniculatum was stressed by Cd, and the distributions of Cd, Ca, P, Na and Cl in plant roots were detected with the aid of SEM-EDX. It was found that endodermis, pith and xylem were the predominant tissues for retardation and regional enrichment of Cd. Na and Cl distributions suggest a critical role of salt resistance tissues on Cd tolerance in roots. P participated in Cd retardation and regional enrichment of endodermis and xylem. P, Na, Cl and Ca distribution had a high correlation to that of Cd in roots. The synergetic accumulation between Ca and Cd could be a crucial mechanism for Cd tolerance in A . corniculatum roots. In conclusion, the research of Cd and nutriment distributions in A . corniculatum roots deepens the understanding on Cd tolerance in mangrove plants. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
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12. Speciation changes of cadmium in mangrove (Kandelia candel (L.)) rhizosphere sediments
- Author
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Lu Haoliang, Zhang Ruifeng, Yan Chongling, Qin Guangqiu, and Liu Jingchun
- Subjects
Geologic Sediments ,Sulfide ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,chemistry.chemical_element ,Toxicology ,Plant Roots ,chemistry.chemical_compound ,Botany ,media_common ,chemistry.chemical_classification ,Rhizosphere ,Cadmium ,biology ,Kandelia candel ,Sediment ,General Medicine ,Hydrogen-Ion Concentration ,biology.organism_classification ,Pollution ,Speciation ,chemistry ,Carbonate ,Rhizophoraceae ,Mangrove - Abstract
The speciation distribution of cadmium (Cd) in mangrove (Kandelia candel (L.) Druce) rhizosphere sediment was investigated after different contents of Cd being loaded. The study results indicated that root induced changes of Cd bioavailability in the rhizosphere. Exchangeable and carbonate bound Cd in the rhizosphere sediments were lower than these in the bulk sediments, whilst an increase in Fe–Mn oxides bound and O.M/sulfide bound fractions occurred in the rhizosphere sediment. Increased levels of Cd in sediments resulted in higher Cd concentrations in mangrove plants, and the order of accumulation was: roots > hypocotyls > stems and leaves.
- Published
- 2007
13. Influence of heavy metals on the carbohydrate and phenolics in mangrove, Aegiceras corniculatum L., seedlings
- Author
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Yan Chongling, Qin Guangqiu, and Lu Haoliang
- Subjects
biology ,Chemistry ,Health, Toxicology and Mutagenesis ,Heavy metals ,General Medicine ,Toxicology ,biology.organism_classification ,Pollution ,Phenols ,Metals, Heavy ,Botany ,Ecotoxicology ,Carbohydrate Metabolism ,Mangrove ,Aegiceras corniculatum ,Primulaceae - Published
- 2006
14. Distribution and speciation of some metals in mangrove sediments from Jiulong river estuary, People's Republic of China
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Yan Chongling, L. Yuhong, Liu Jingchun, H. Jun, and Mark R. Macnair
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geography ,China ,Geologic Sediments ,Minerals ,geography.geographical_feature_category ,business.industry ,Health, Toxicology and Mutagenesis ,media_common.quotation_subject ,Sediment ,Distribution (economics) ,People's Republic ,Mineralogy ,Estuary ,Fresh Water ,General Medicine ,Toxicology ,Pollution ,Soil contamination ,Speciation ,Oceanography ,Environmental science ,Mangrove ,business ,media_common - Published
- 2005
15. Phosphorus effects on radial oxygen loss, root porosity and iron plaque in two mangrove seedlings under cadmium stress.
- Author
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Dai, Minyue, Liu, Jingchun, Liu, Wenwen, Lu, Haoliang, Jia, Hui, Hong, Hualong, and Yan, Chongling
- Subjects
MANGROVE plants ,OXYGEN ,POROSITY ,IRON ,SEEDLINGS ,PHYSIOLOGICAL effects of phosphorus - Abstract
Phosphorus is an indispensable element for plants, but its role in alleviating the cadmium toxicity of mangrove seedlings is poorly documented. In this study, mangrove seedlings were grown in hydroponics and exposed to various Cd and P treatments. Data suggested that the inhibitory effect of Cd on the rate of radial oxygen loss and root porosity was alleviated by P. A. marina had a higher rate of ROL and POR, indicating that it had a stronger adaptability to anaerobic environment. K. obovata induced a higher Fe concentration in iron plaque under co-application of Cd and P, which may relate to higher biomass. Furthermore, P increased Cd concentration in iron plaque, implying that iron plaque can be an obstacle to prevent Cd entering into the plant, but most Cd was still distributed in its roots. These findings highlight a novel mechanism of Cd detoxification with P addition in mangrove seedlings. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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16. Effects of root exudates on the leachability, distribution, and bioavailability of phenanthrene and pyrene from mangrove sediments.
- Author
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Jia, Hui, Lu, Haoliang, Liu, Jingchun, Li, Jian, Dai, Minyue, and Yan, Chongling
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MANGROVE plants ,PYRENE ,ANTHRACENE ,PHENANTHRENE ,BIOAVAILABILITY ,BIOCHEMISTRY - Abstract
In this study, column leaching experiments were used to evaluate the leachability, distribution and bioavailability of phenanthrene and pyrene by root exudates from contaminated mangrove sediments. We observed that root exudates significantly promoted the release and enhanced the bioavailability of phenanthrene and pyrene from sediment columns. The concentration of phenanthrene and pyrene and cumulative content released from the analyzed sediment samples following root exudate rinsing decreased in the following order: citric acid > oxalic acid > malic acid. After elution, the total concentrations of phenanthrene and pyrene in sediment layers followed a descending order of bottom (9-12 cm) > middle (5-7 cm) > top (0-3 cm). Furthermore, a positive correlation between leachate pH values and PAH concentrations of the leachate was found. Consequently, the addition of root exudates can increase the leachability and bioavailability of phenanthrene and pyrene. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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17. Fraction distribution and migration of heavy metals in mangrove-sediment system under sulphur and phosphorus amendment.
- Author
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Li, Jian, Liu, Jingchun, Lin, Yushan, Yan, Chongling, and Lu, Haoliang
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HEAVY metal content of plants ,MANGROVE forests ,SEDIMENTATION & deposition ,SULFUR ,PHOSPHORUS ,SEEDLINGS ,RHIZOSPHERE - Abstract
In this study, mangrove seedlings (Kandelia obovata(S. L.)) were cultivated in rhizo-boxes, which contain sediments collected from natural mangrove forest and modified with different rates of sulphate and phosphate. The fraction distributions of Zn, Cd, Cu, Ni and Pb in rhizosphere and non-rhizosphere sediments were studied by using a sequential extraction method. Metal concentrations in plant tissues and iron plaque on root surface were also determined to reveal migration variation of heavy metals in the plant-sediment system. The results showed that the activities ofK. obovataroots enhance the reducible metals while reducing acid-extractable and oxidisable metals; sulphur amendment benefits the combination of metal ions with S2–and therefore reduces the bioavailability of metal pollutants; addition of sulphur also improves the content of iron plaque on the root surface, which plays an important role in metal accumulation byK. obovataroot tissue; the addition of sulphur markedly reduces the concentration of Cd in roots, but significantly enhanced the concentrations of Cu, Zn, Ni and Pb in roots. The results indicate that sulphur and phosphorus content in mangrove sediment, and the growth of mangrove plant can significantly influence the migration of heavy metals in the mangrove wetland ecosystem. [ABSTRACT FROM AUTHOR]
- Published
- 2016
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18. A brief review on pollution and ecotoxicologic effects on Sundarbans mangrove ecosystem in Bangladesh
- Author
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Yan Chongling, Mohammed Mahabubur Rahman, Kazi Shakila Islam, and Lu Haoliang
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Pollution ,geography ,geography.geographical_feature_category ,Ecology ,media_common.quotation_subject ,Biodiversity ,Environmental pollution ,Wetland ,Environmental protection ,Pollution prevention ,Environmental science ,Ecosystem ,Mangrove ,Water pollution ,media_common - Abstract
The natural ecosystem of the Sundarbans mangrove wetlands is under threat due to anthropogenic activities. This ecosystem has become vulnerable to pollution such as oil spillage, heavy metals, and agrochemicals – which may have changed the mangrove ecosystem's biogeochemistry. In this paper, the present status of Sundarbans' mangrove pollution is reviewed. The ecotoxicologic effect on its aquatic and terrestrial flora and fauna, and pollution management problems are also discussed. Conservation and environmental pollution management for protecting this world's largest mangrove ecosystem are immediately needed. Environmentally sound technology should be adapted for pollution prevention, control and remediation in the Sundarbans mangrove wetlands.
- Published
- 2009
19. The influence of flavonoid amendment on the absorption of cadmium in Avicennia marina roots.
- Author
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Li, Jian, Lu, Haoliang, Liu, Jingchun, Hong, Hualong, and Yan, Chongling
- Subjects
FLAVONOIDS ,CADMIUM content of plants ,AVICENNIA ,ABSORPTION ,PLANTS ,ION transport (Biology) ,PLANT roots - Abstract
Flavonoid is a key factor for the tolerance to cadmium in plants. Concentration-dependent kinetics experiment was conducted to investigate the influence of flavonoid amendment on the Cd 2+ uptake in Avicennia marina (Forsk) Vierh. roots. We found that compared with the control, saturation concentration and maximal absorption rate of Cd was higher under flavonoid amendment ( p <0.05). When roots were exposed to ion transport inhibitor (LaCl 3 ), flavonoid amendment also facilitated Cd transport in roots. Flavonoids had no influence on Cd 2+ uptake in root cell walls. In conclusion, flavonoids enhance the tolerance to Cd and have a significant stimulative effect on symplasm transport of Cd in A. marina roots. Ca 2+ -channel was not the unique means of symplasm transport for Cd 2+ absorption. [ABSTRACT FROM AUTHOR]
- Published
- 2015
- Full Text
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20. Effect of external phosphate addition on solid-phase iron distribution and iron accumulation in Mangrove Kandelia obovata (S. L.).
- Author
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Du, Jingna, Liu, Jingchun, Lu, Haoliang, Hansell, Dennis, Zhang, Qiong, Wang, Wenyun, and Yan, Chongling
- Subjects
PHOSPHATES ,IRON ,RHIZOSPHERE ,ORGANIC compounds ,MANGROVE plants - Abstract
In this study, a pot experiment was conducted to evaluate the effect of phosphate (PO) addition on iron (Fe) cycling in mangrove ecosystem. Kandelia obovata (S. L.), one of the dominant mangrove species in the southeast of China, was cultivated in rhizoboxes under three different levels of P concentrations. Results showed the solid-phase Fe distribution and Fe(II)/Fe(III) values in both the root zone (rhizosphere) and bulk soil (non-rhizosphere) were comparable among all P levels ( p > 0.05); P addition significantly decreased the pore water Fe content both in the rhizosphere and non-rhizosphere zone ( p < 0.05); higher amount of reactive Fe was found in rhizosphere sediments, while in the non-rhizosphere sediments, higher concentration of crystalline Fe was determined; P significantly increased iron plaque formation and iron accumulation in K. obovata (S. L.) tissues ( p < 0.05); P addition increased K. obovata (S. L.) biomass and chlorophyll content. It was suggested that P is implicated in the Fe cycling in mangrove plants; more reactive iron, higher abundance of root Fe-reducing bacteria (FeRB) and Fe-oxidizing bacteria (FeOB), and together with higher amount of K. obovata (S. L.) root organic acids exudation result in a rapid Fe cycling in rhizosphere, which contribute to comparable solid-phase iron distribution among different P levels. [ABSTRACT FROM AUTHOR]
- Published
- 2015
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21. Interactive effects of cadmium and pyrene on contaminant removal from co-contaminated sediment planted with mangrove Kandelia obovata (S., L.) Yong seedlings.
- Author
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Wang, Wenyun, Zhang, Xuefeng, Huang, Jing, Yan, Chongling, Zhang, Qiong, Lu, Haoliang, and Liu, Jingchun
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PYRENE ,SEDIMENTS ,CADMIUM poisoning ,MANGROVE plants ,SEEDLINGS ,PLANT growth ,PLANT cells & tissues - Abstract
Highlights: [•] Cd–Pyr co-contamination had prohibitive effects on the growth of K. obovata. [•] Pyr increased more Cd remove to plant tissues, increased Cd toxicity to K. obovata. [•] Cd toxicity inhibited the degradation of Pyr in co-contaminated sediments. [•] Cd toxicity inhibited the growth of microorganisms in sediments treated with Pyr. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
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22. Accumulation, distribution and toxicological effects induced by chromium on the development of mangrove plant Kandelia candel (L.) Druce.
- Author
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Rahman, Mohammed Mahabubur, Yan Chongling, Rahman, Md. Motiur, and Islam, Kazi Shakila
- Subjects
PLANTS ,CHROMIUM ,METALS ,AGRICULTURE ,SEEDLINGS ,CHLOROSIS ,NECROSIS ,BOTANY - Abstract
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- Published
- 2009
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23. Analysis of anatomical changes and cadmium distribution in Aegiceras corniculatum (L.) Blanco roots under cadmium stress.
- Author
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Li, Jian, Yu, Junyi, Du, Daolin, Liu, Jingchun, Lu, Haoliang, and Yan, Chongling
- Subjects
CADMIUM ,MANGROVE plants ,XYLEM ,HEAVY metals ,PLANT anatomy ,PLANT roots ,PHLOEM ,BLOOD vessels - Abstract
Heavy metal stress changes the morphological and anatomical structure of plant organs. In this study, we determined the anatomical changes and Cd distribution in the roots of Aegiceras corniculatum (L.) Blanco (Black mangrove) under Cd stress. The results showed that Cd levels in A. corniculatum root tissues decreased in the following order: endodermis > pith > xylem > epidermis and exodermis > phloem > cortex. The endodermis secondary casparian strip replaces exodermis casparian strip and plays a role in the "retardation mechanism", which sort of compensates for the missing exodermis retardation effect. The xylem and pith both show high affinity for Cd and contain enriched Cd. This creates a low-Cd environment for phloem and protects the nutrient transport function of the vasculature against Cd toxicity. The present study provides new evidences suggesting that Cd regional enrichment and anatomical structure changes are an adaptive strategy of mangrove plants to HM tolerance. • The endodermis secondary casparian strip participates in "retardation mechanism". • The endodermis compensates for the missing exodermis retardation effect. • The xylem and pith show high affinity for Cd that in the vasculature. • Xylem and pith protect nutrient transport function of vasculature from Cd toxicity. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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24. Iron plaque formation and its influences on the properties of polyethylene plastic surfaces in coastal wetlands: Abiotic factors and bacterial community.
- Author
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Zhang, Xiaoting, Lin, Lujian, Li, Hanyi, Liu, Shanle, Tang, Shuai, Yuan, Bo, Hong, Hualong, Su, Manlin, Liu, Jingchun, Yan, Chongling, and Lu, Haoliang
- Subjects
- *
COASTAL wetlands , *PLASTIC marine debris , *BACTERIAL communities , *LOW density polyethylene , *PLASTICS , *POLYETHYLENE , *IRON - Abstract
Iron (Fe) plaques in coastal wetlands are widely recognized because of their strong adsorption affinity for natural particles, but their interaction behaviors and mechanisms with plastics remain unknown. Through laboratory incubation experiments, paired with multiple characterization methods and microbial analysis, this work focused on the characteristics of Fe plaques on low-density polyethylene plastic surfaces and their relationship with environmental factors in coastal wetlands (Mangrove and Spartina alterniflora soil). The results showed that iron plaques increased the adhesive force of the plastic surface from 65.25 to 300 nN and promoted the oxidation of the plastic surface. Fe plaque formation was stimulated by salinity, anaerobic conditions, natural organic matter, and a weak alkaline scenario (pH 8.0–8.3). The Fe content showed a stable positive correlation with heavy metals loading (i.e., As, Mn, Co, Cr, Pb, and Zn). Furthermore, we revealed that Fe plaque was positively regulated by Nitrospirae through 16S rRNA high-throughput sequencing analysis. Meanwhile, Verrucomicrobia and Kiritimatiellaeota. may act as depressants by consuming salt. This work illustrated that iron plaques could enhance the role of plastics in contaminant migration by altering their adsorption performance, providing new insights into plastic interface behavior and potential ecological effects in coastal wetlands. [Display omitted] • Linkage between plastics/microplastics and iron plaques has been revealed. • Salinity, pH, and oxygen affect the formation of Fe plaque on plastic surfaces. • The dominant Nitrospirae is associated with forming iron plaque on plastics. • Fe plaques on the LDPE surface enhance heavy metal adsorption. • Fe plaques promote the oxidation of plastic surfaces. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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25. Influence of the phenols on the biogeochemical behavior of cadmium in the mangrove sediment.
- Author
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Li, Jian, Liu, Jingchun, Lu, Haoliang, Jia, Hui, Yu, Junyi, Hong, Hualong, and Yan, Chongling
- Subjects
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CADMIUM content of plants , *MANGROVE plants , *BIOGEOCHEMISTRY , *PLANT-soil relationships , *AVICENNIA , *RHIZOSPHERE - Abstract
Phenols exert a great influence on the dynamic process of Cd in the soil-plant interface. We investigated the influence of phenols on the biogeochemical behavior of cadmium in the rhizosphere of Avicennia marina (Forsk) Vierh. All combinations of four levels of cadmium (0, 1, 2 and 4 mg/kg DW) and two levels of phenol (0 and 15 mg/kg DW) were included in the experimental design. We found that phenols facilitated increasing concentrations of exchangeable cadmium (Ex-Cd), acid volatile sulfide (AVS) and reactive solid-phase Fe (II) in sediments, and iron in plants, but inhibited Cd accumulation in iron plaque and roots. The concentrations of AVS and reactive solid-phase Fe (II) were significantly positively correlated with Cd treatment. As for the biogeochemical behavior of Cd in mangrove sediments, this research revealed that phenols facilitated activation and mobility of Cd. They disturbed the “source-sink” balance of Cd and turned it into a “source”, whilst decreasing Cd absorption in A. marina . Additionally, phenols facilitated iron absorption in the plant and alleviated the Fe limit for mangrove plant growth. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
26. Rhizodegradation gradients of phenanthrene and pyrene in sediment of mangrove (Kandelia candel (L.) Druce)
- Author
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Lu, Haoliang, Zhang, Yong, Liu, Beibei, Liu, Jingchun, Ye, Juan, and Yan, Chongling
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PHENANTHRENE , *PYRENE , *PHOTODEGRADATION , *MANGROVE plants , *PLANT growth , *BIODEGRADATION - Abstract
Abstract: A greenhouse experiment was conducted to evaluate degradation gradient of spiked phenanthrene (Ph, 10mgkg−1) and pyrene (Py, 10mgkg−1) in rhizosphere of mangrove Kandelia candel (L.) Druce. Rhizosphere model system was set up using a self-design laminar rhizoboxes which divided into eight separate compartments at various distances from the root surface. After 60 days of plant growth, presence of the plant significantly enhanced the dissipation of Ph (47.7%) and Py (37.6%) from contaminated sediment. Higher degradation rates of the PAHs were observed at 3mm from the root zone (56.8% Ph and 47.7% Py). The degradation gradient followed the order: near rhizosphere>root compartment>far-rhizosphere soil zones for both contaminants where mangrove was grown. Contribution of direct plant uptake and accumulation of Ph and Py were very low compared to the plant enhanced dissipation. By contrast, plant-promoted biodegradation was the predominant contribution to the remediation enhancement. The correlation analysis indicates a negative relation between biological activities (microbial biomass carbon, dehydrogenase, urease, and phosphatase activity) and residual concentrations of Ph and Py in planted soils. Our results suggested that mangrove rhizosphere was effective in promoting the depletion of aromatic hydrocarbons in contaminated sediments. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
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