Population Structure and Genetic Diversity of Sweet Cassava Accessions from the Midwestern, Southeastern and Southern Regions of Brazil
Braz. arch. biol. technol
;
62: e19180556, 2019. tab, graf
Article
in English
| LILACS
| ID: biblio-1019540
ABSTRACT
Abstract The objective of this work was to screen sweet cassava accessions collected in smallholding areas in the Midwestern, Southeastern and Southern regions of Brazil, using 15 SSR molecular markers, to determine population structure and genetic diversity. Polymorphism was detected in every loci analyzed, with mean of 6.33 alleles per locus, and mean polymorphism information content (PIC) of 0.6057, pointing out that the primers were highly informative. The observed heterozygosity ranged from 0.0709 (SSRY 101) to 0.9398 (GA 12), with a mean of 0.6511, and mean genetic diversity of 0.6578, ranging from 0.3592 (GA 136) to 0.8116 (SSRY 21). The most dissimilar combinations observed were BGM526PR-BGM596MS, BGM526PR-BGM622MS and BGM526PR-BGM629MS. The traditional cassava cultivars assessed were divided into four distinct groups two with cultivars from the South, one from the Southeast and one from the Midwestern region of Brazil. The variances among and within groups determined by the analysis of molecular variance were 44 and 56%, respectively. The PhiPT parameter (analogue to Fst) of 0.44 indicates high differentiation among groups. Broad genetic diversity was found among the traditional sweet cassava cultivars assessed, and the most divergent groups were formed by cultivars from the South and the Midwestern regions of Brazil.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Manihot
/
Seed Bank
Country/Region as subject:
South America
/
Brazil
Language:
English
Journal:
Braz. arch. biol. technol
Journal subject:
Biology
Year:
2019
Type:
Article
Affiliation country:
Brazil
Institution/Affiliation country:
Federal University of São Carlos/BR
/
Federal University of Technology/BR
/
State University of Campinas/BR
/
State University of Maringá/BR
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