Variabilidade genética de acessos da cultivar ‘BRS Bela’ de Stylosanthes guianensis usando marcadores moleculares RAPD

Matida, Elizangela Tieko; Chiari, Lucimara; Simeão, Rosângela Maria; Fernandes, C. D.; Arguelho, Edihanne Gamarra; Both, Diego Pazinato

doi:10.1590/s0103-84782012005000128

Cited by 3 publications

(4 citation statements)

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“…The results observed here for grouping by the Tocher method diverge from those of studies carried out with Stylosanthes accessions, which also used the UPGMA method (KARIA, 2008;DATE et al, 2010;MATIDA et al, 2013) and where the resulting groups correlated with the botanical varieties. The small differences regarding the formation of the two groupings can be partly explained by the criteria adopted for separation by each of the methods (ELIAS et al, 2007;CRUZ et al, 2012;LIMA et al, 2012).…”

Section: Figurecontrasting

confidence: 99%

GENETIC DIVERSITY IN ACCESSIONS OF Stylosanthes spp. USING MORPHOAGRONOMIC DESCRIPTORS

et al. 2016

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-The great diversity of plants in the Brazilian Semiarid environment represents a vital natural resource for the human populations of these areas. Many of these plants have been subject to extractivism and among these, the species of the genus Stylosanthes, which have occurrence in this region, show great potential, however, studies on this topic are limited, and little is known about the existing variability among these plants. Therefore, further study is necessary, to facilitate the development of cultivars. This might reduce the scarcity of fodder supply in this region, but to commence a plant breeding programme, it is essential to identify genetic variability. Therefore, this study evaluated 25 accessions of Stylosanthes spp., to identify the most suitable candidates to be parents in a plant breeding programme for the semiarid region of the state of Bahia. Two experiments were carried out in different sites in an experimental design of randomized blocks with four replicates, with a spacing of 3.0 × 8.0 m. A large amount of genetic diversity was observed among accessions and the genotypes BGF 08-007, BGF 08-016, BGF 08-015 and BGF 08-021 were the most divergent in the overall evaluation. For the structuring of segregating populations, it is recommended to combine the genotypes BGF 08-016, BGF 08-015, BGF 08-007 and BGF 08-006, and for the interspecific crosses, a hybrid from the accession BGF-024 with the accessions BGF 08-016 or BGF 08-015. This might generate superior individuals for mass descriptors, which are the most important for animal forage breeding.Keywords: Semiarid. Native forage. Morphological descriptors. DIVERSIDADE GENÉTICA EM ACESSOS DE Stylosanthes spp. UTILIZANDO DESCRITORES MORFOAGRONÔMICOSRESUMO -A grande diversidade de plantas do Semiárido representa um recurso natural vital para as populações humanas dessa região. Muitas dessas plantas são exploradas de forma extrativista e entre elas, as espécies do gênero Stylosanthes, que são nativas tem grande potencial, porém, os trabalhos realizados têm sido modestos e pouco se conhece a respeito da variabilidade existente nessas plantas. Por isso, esforços devem ser priorizados no sentido de estudá-las, o que certamente poderá ajudar a criar formas para o desenvolvimento de cultivares e, assim, amenizar a escassez de forragem nessa região. Entretanto, para iniciar trabalhos de melhoramento, primeiro deve-se buscar variabilidade genética. Assim, este trabalho avaliou 25 acessos de Stylosanthes spp., a fim de identificar os melhores para serem genitores no programa de melhoramento genético para o Semiárido baiano. Para isso, foram conduzidos dois experimentos em diferentes locais no delineamento blocos casualizados completos com quatro repetições num espaçamento 3,0 × 0,8 m. Foi constatada grande diversidade genética entre os acessos, sendo que os genótipos BGF 08-007, BGF 08-016, BGF 08-015 e BGF 08-021, mostraram-se como os mais divergentes na avaliação geral. Para a formação de populações segregantes, recomenda-se combinar os genótipos ...

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Section: Figurecontrasting

confidence: 99%

GENETIC DIVERSITY IN ACCESSIONS OF Stylosanthes spp. USING MORPHOAGRONOMIC DESCRIPTORS

et al. 2016

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“…It can be stated that 95% of the (full-siblings;Sinclair et al, 2014). The occurrence of such outcrossing could be due to the behavior of pollinizers that systematically visit neighboring plants and nonsynchronism in the fluorescence of parental individuals (Matida et al, 2013). In our results, the r p rate revealed that 4.5% of crosses originated from full-sibling families.…”

Section: Outcrossing Systemmentioning

confidence: 47%

“…The basic information includes the mode of reproduction and outcrossing rates, which will be crucial to guide the breeding programs and the conservation of germplasm (Matida et al, 2013). The basic information includes the mode of reproduction and outcrossing rates, which will be crucial to guide the breeding programs and the conservation of germplasm (Matida et al, 2013).…”

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confidence: 99%

“…Comprehensive knowledge of the species under analysis is crucial to choose the best strategies for breeding programs. The basic information includes the mode of reproduction and outcrossing rates, which will be crucial to guide the breeding programs and the conservation of germplasm (Matida et al, 2013). Outcrossing rates have been precisely estimated using molecular markers through analyses of progenies in different species (Baye and Becker, 2004;Thompson and Ritland, 2006;Muchugi et al, 2008;Ferreira et al, 2010;Adugna et al, 2013;Bressan et al, 2013).…”

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Estimation of Outcrossing Rate in Napier Grass

et al. 2019

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Napier grass [Cenchrus purpureus (Schumach.) Morrone], also known as elephant grass, is an important tropical forage that has the potential to become an alternative feedstock for energy production. Knowledge about the mode of reproduction and outcrossing rate is essential to select the best strategy to apply in breeding programs to develop new cultivars for application in energy and forage production systems. The objective of this work was to evaluate the outcrossing rate in two Napier grass breeding populations. Six microsatellite markers were used to genotype 28 half‐sibling families totaling 588 individuals, and pollen viability was checked by fluorescein diacetate test (FDA) methodology. A total of 14,603 pollen grains were assessed; 7751 (53%) were considered viable, and 6852 (47%) were considered sterile. Forty‐two alleles were found among all evaluated individuals, and analysis of molecular variance results showed that 14% of variance occurred among half‐siblings and 86% occurred within half‐siblings. Comparison of molecular data among parental and half‐sibling populations found 95.3% of seeds derived from outcrossing, indicating that Napier grass is predominantly allogamous. Currently, directional crosses and hybrid formation in Napier grass depend on the inflorescence protection and pollen collection of selected individuals. Since our results suggest that the self‐fecundation rate is very low (5%), other strategies like unprotected directional crosses can be applied to implementation of large‐scale hybrid production.

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Morphological analyses support taxonomic updates in Brazilian species of Stylosanthes Sw. (Papilionoideae, Leguminosae)

Gissi,

Torke,

Simon

et al. 2024

Preprint

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Stylosanthes Sw. is a pantropical genus primarily distributed throughout the Americas, with the Brazilian Cerrado serving as its principal center of diversity. Many of its species hold significant economic potential and are widely utilized as fodder for cattle. Systematic examinations involving both morphology and nomenclature have highlighted the imperative need for taxonomic updates in select species. Given the observed morphological and ecological differences, a taxonomic reevaluation of S. guianensis (Aubl.) Sw. was deemed necessary, leading to the elevation of its varieties to the species level. The taxonomic changes include the new combinations S. microcephala (M.B. Ferreira & Sousa Costa) Gissi, S. pauciflora (M.B. Ferreira & Sousa Costa) Gissi, and S. pubescens (Pilger) Gissi. Furthermore, a neotype for S. nunoi Brandão is designated due to the loss of the holotype. Stylosanthes pohliana Taub. is reinstated as an accepted species, and a novel species within the genus is described. X-ray imaging of leaflets emerges as a valuable tool for taxonomic discrimination. This comprehensive study not only presents nomenclatural modifications but also provides illustrations, comments on diagnostic characteristics, distribution maps, and preliminary IUCN conservation assessments. Additionally, a novel discovery is introduced with the recognition of an elaiosome in the fruits of S. guianensis, constituting a noteworthy addition to the tribe Dalbergieae.

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Variabilidade genética de acessos da cultivar ‘BRS Bela’ de Stylosanthes guianensis usando marcadores moleculares RAPD

Abstract: IVVariabilidade genética de acessos da cultivar 'BRS Bela' de Stylosanthes guianensis usando marcadores moleculares RAPD

Cited by 3 publications

References 1 publication

GENETIC DIVERSITY IN ACCESSIONS OF Stylosanthes spp. USING MORPHOAGRONOMIC DESCRIPTORS

GENETIC DIVERSITY IN ACCESSIONS OF Stylosanthes spp. USING MORPHOAGRONOMIC DESCRIPTORS

Estimation of Outcrossing Rate in Napier Grass

Morphological analyses support taxonomic updates in Brazilian species of Stylosanthes Sw. (Papilionoideae, Leguminosae)

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