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Universidade Estadual Paulista Júlio de Mesquita Filho (2013)

Estudo da diversidade genética em acessos de Jatropha spp. por meio de caracteres morfológicos e marcadores moleculares ISSR

Pazeto, Mariana Silva Rosa

Titre : Estudo da diversidade genética em acessos de Jatropha spp. por meio de caracteres morfológicos e marcadores moleculares ISSR

Auteur : Pazeto, Mariana Silva Rosa

Université de soutenance : Universidade Estadual Paulista Júlio de Mesquita Filho

Grade : Doutourado 2013

Résumé
The genus Jatropha belongs to the Euphorbiaceae family, it has about 170 species distributed in tropical semi- arid regions of Africa and the Americas. Among the species of Jatropha are physic nut (J. curcas L.), pinhão-bravo (J. pohliana Müell), as is known in Brazil and purple pinion (J. gossypiifolia L.). Studies of phenotypic and genetic variability of a population are important for plant breeders, as they help in the characterization of accessions, and facilitate the selection of parents for crosses targeted. Thus, the present study aimed to evaluate Jatropha accessions of three species by morphological characters and ISSR molecular markers in order to group them according to the degree of divergence. There was greater variability in interspecific than intraspecific groups to access, both for morphological and molecular characters. Qualitative and quantitative characters showed variability among accessions and could serve as a basis for future genetic studies of Jatropha species. There was no relation between the pattern of similarity and geographic origin of accessions in the cluster analysis by UPGMA. The average percentage of polymorphism for ISSR found among the accessions studied was 40.6%. There was greater genetic similarity among accessions of J. pohliana and J. gossypiifolia and lower among J. pohliana and J. curcas

Mots clés  : Pinhão-manso ; Plantas - Melhoramento genetico ; Diversidade genética ; Plant-breeding

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Page publiée le 16 décembre 2015, mise à jour le 7 juillet 2017