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The remaining populations of perennial cotton (Gossypium hirsutum L. r. marie-galante Hutch.) that occur in northeastern Brazil are part of the primary gene pool for the creation of modern upland cotton cultivars. Therefore, we present fiber technological properties, genetic diversity and population structure analysis of four populations of G. hirsutum L. r. marie-galante from Para&305;´ba state in Brazil, using the High-Volume Instrument (HVI) analytical system and Inter Simple Sequence Repeats (ISSRs) polymorphic loci, respectively. The fiber technological properties differed between populations. The average length, resistance, micronaire index, maturity index and count-strength-product of the populations are consistent with the fiber quality traits present in commercial upland cotton cultivars. The populations showed low levels of total (HT= 0.1305) and intrapopulation (HS = 0.0806) genetic diversity, besides high genetic differentiation (GST= 0.3824) and low indirect gene flow (Nm = 0.875) and are structured in two gene clusters by Bayesian inference. The positive relationship between genetic distance and geographical distance using the Mantel test (r=0.8364; p value=0.0038) suggests that genetic divergence among populations can be explained by spatial isolation. This information can support genetic conservation and the valuation of these populations for cotton breeding programs. Made available in DSpace on 2022-10-04T19:40:05Z (GMT). No. of bitstreams: 1 MULTI-LEVEL-CHARACTERIZATION-11.pdf: 358060 bytes, checksum: 43c5d3ed482c4d03ae2e991c313d5dd0 (MD5) Previous issue date: 2022

Ricin, (Ricinus communis agglutinin, RCA) is one of the most poisonous of naturally occurring substances and has great potential for bioterrorism because no antidote exists. Fast detection at low concentrations is a challenge, and vital to the development of proper countermeasures. In this study, a square wave adsorptive stripping voltammetric (SWAdSV) method for determining RCA using a cathodically polarized boron-doped diamond (BDD) electrode is presented. An irreversible electrochemical RCA oxidation peak was identified on the BDD electrode by different voltammetric techniques using both direct and adsorptive stripping modes. An adsorption-controlled (slope log Ip vs log v of 0.80) pHdependent process was observed. For values of 1.0pH 9.0, the numbers of protons and electrons associated with the oxidation reaction were estimated (ca. 1.0) by differential pulse voltammetry. The RCA oxidation step may correspond to the oxidation of tryptophan amino acid residues, and occurs in a complex mechanism. The excellent analytical performance of the cathodically polarized BDD electrode in combination with the stripping mode ramp was verified with RCA by using a short deposition time in an open circuit potential (120 s). Under optimized analysis conditions, a linear response in the range of (3.3?94.0)3109 mol L1 (r2=0.9944) and a limit of detection of 6.231010 mol L1 were estimated. This LOD is lower than several methods found in the literature. For example, it is 168 times lower than that obtained by using square wave voltammetric with a glassy carbon electrode. Moreover, an even lower LOD might be achieved by using the SWAdSV method with a higher pre-concentration time. In addition, trace levels of RCA were successfully determined in different castor seed cultivars with an overall average recovery from 99.2 1.6% for the three different RCA-A concentration levels. The high accuracy of the analytical data highlights the use of the proposed method for determining RCA in other samples. Made available in DSpace on 2017-12-23T23:31:48Z (GMT). No. of bitstreams: 1 AdsorptiveStripping.pdf: 2872790 bytes, checksum: f3d67c5d39155885b2e35449a3b80633 (MD5) Previous issue date: 2017-12-22

BRS 425 is a high-oleic runner peanut cultivar related to wild ancestral parents, partially resistant to early and late leaf spot and spotted wilt. It is large-seeded and contains 46% oil. BRS 425 is adapted to the main peanut producing regions of Brazil. Made available in DSpace on 2019-11-19T18:10:05Z (GMT). No. of bitstreams: 1 BRS425PeanutCultivarTaisSuassuna.pdf: 329506 bytes, checksum: e395662a3da1a5be2a24cc0d0ca93195 (MD5) Previous issue date: 2019

Cotton crops generate millions of tons of lignocellulosic waste in Brazil that could be used in energy generation; however, the main destination of this raw material is soil incorporation. The aim of this work was to perform an energetic characterization and evaluation of briquettes produced from different agricultural waste of naturally colored cotton for power generation. The cultivars Brasil Sementes (BRS) Jade and Topazio were studied, with white cotton (BRS 286) as standard for comparison purposes. Two different parts of each species, stalk and cotton shell, were analyzed by bulk density, proximate analysis, higher heating value, cellulose, hemicellulose, protein, fat and lignin content, thermogravimetric analysis, and briquette mechanical strength. The results of the energetic characterization indicated a higher energetic potential of the colored species when compared with the white cotton, especially because of the volatile matter content, fixed carbon, and higher heating value. The briquette mechanical strength was higher in the samples formulated by a mixture of stalk and shell. Finally, it was concluded that the waste from colored cotton cultivars, Jade and Topazio, is capable to generate briquettes with good mechanical and physicochemical characteristics, especially those formed by the mixture of stalk and shell. Made available in DSpace on 2020-01-14T00:40:57Z (GMT). No. of bitstreams: 1 EnergeticCharacterizationandevaluation.pdf: 811146 bytes, checksum: db49b2dd099a5df8cfc322c5d86df386 (MD5) Previous issue date: 2019

Made available in DSpace on 2017-12-23T23:32:13Z (GMT). No. of bitstreams: 1 Productivityand.pdf: 369045 bytes, checksum: b72c84af66c70569b8f94400a7e7dc0a (MD5) Previous issue date: 2017-12-22

Development of leaf spots resistant runner peanut cultivars is one of the major demands in Brazil. In the 2009/10 crop season, 12 pre-breeding progenies (LPM) were selected out of 380 plants of an interspecific BC1F3 population for leaf spots resistance and agronomic traits. In the 2010/11, the 12 LPMs were evaluated for leaf spots resistance, without fungicide sprays. The recurrent parent (susceptible control) and all LPMs were susceptible; partial resistant segregating plants were selected. Some progenies had yield, pod and seed shape similar to the control. The 12, and the 5 LPMs selected in the 2011/12 and 2012/13 crop seasons, respectively, were evaluated under appropriate disease management. Differences were detected for pod yield and weight of 100 seeds. Seed/pod weight ratio, oil content and oleic/linoleic ratio were similar to the control. Individual plants were selected for pod yield and market quality. Variability detected in the first backcross generation for partial resistance and agronomic traits will be useful. Made available in DSpace on 2016-03-23T06:48:53Z (GMT). No. of bitstreams: 1 Yieldmarkerqualityandleafspots....pdf: 302656 bytes, checksum: c4224fa14b917360a70f603647ed4bdc (MD5) Previous issue date: 2016-03-22

Made available in DSpace on 2011-04-09T14:03:00Z (GMT). No. of bitstreams: 1 RBOF141927.pdf: 129048 bytes, checksum: b9b701037682e6757a3689e06758722b (MD5) Previous issue date: 2010-09-23