Título:	Farmer variety exchange along Amazonian rivers influences the genetic structure of manioc maintained in a regional Brazilian GeneBank.
Autoria:	SOUSA, S. B. SILVA, G. F. da DIAS, M. C. CLEMENT, C. R. SOUSA, N. R.
Afiliação:	INPA; GILVAN FERREIRA DA SILVA, CPAA; MIGUEL COSTA DIAS, CPAA; INPA; NELCIMAR REIS SOUSA, CPACP.
Ano de publicação:	2017
Referência:	Genetics and Molecular Research, v. 16, n. 3, July 2017.
Conteúdo:	Knowledge of agro-morphological and genetic variability of germplasm diversity is a prerequisite for its use in breeding. The aim of this study was to characterize the genetic diversity of the manioc (Manihot esculenta) Active Germplasm Bank (AGB) at Embrapa Amazônia Ocidental using microsatellite markers. We evaluated 470 accessions collected along five of the main rivers of the Amazon basin: Solimões, Purus, Madeira, Negro, and Amazon. The ten SSR loci used showed high levels of genetic diversity, the polymorphism information content ranged from 0.35 to 0.84, and the mean number of alleles per locus was 11.3. Accessions from the Madeira River had a higher Shannon index (1.52), as well as the largest number of private alleles (19). Bayesian inference of genetic structure implemented in the Structure software suggested the existence of two groups of accessions without clear association with river basins. The accumulated variation in the first two axes of the principal coordinate analysis revealed low genetic divergence between these groups, while AMOVA identified most of the molecular variance within the groups. Farmer exchange of varieties along and among rivers probably explains the lack of structure. Although the manioc AGB of Embrapa Amazônia Ocidental contains abundant genetic diversity, no differentiation was found between the groups studied.
Thesagro:	Mandioca Germoplasma Manihot Esculenta
Palavras-chave:	Diversidade genética Manioc
Digital Object Identifier:	http://dx.doi.org/10.4238/gmr16039690
Tipo do material:	Artigo de periódico
Acesso:	openAccess
Aparece nas coleções:	Artigo em periódico indexado (CPAA)