TITLE:
Genetic Diversity of Accessions and First Generation Progeny of the Mangaba Genebank
AUTHORS:
Adrielle Naiana Ribeiro Soares, Debora Clivati, Marília Freitas de Vasconcelos Melo, Matthew Gitzendanner, Pamela Soltis, Douglas Soltis, Josué Francisco da Silva Júnior, Ana da Silva Ledo, Ana Veruska Cruz da Silva
KEYWORDS:
Hancornia speciose Gomes, Brazilian Fruits, Microsatellite Markers, Genetic Resources
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.9 No.8,
July
10,
2018
ABSTRACT: Mangaba
(Hancornia speciose Gomes—Apocynaceae) is an
important fruit tree in Brazil and has an unexplored stock germplasm collection.
Commercial varieties are unavailable and little is known about its potential as
a source of genetic diversity for molecular breeding programs. Progeny tests
may improve studies on commercial variability and facilitate genetic
improvement of the species. Our aim was to evaluate the genetic diversity and
structure of accessions and progeny from
the Mangaba Genebank of Embrapa Coastal Tablelands. We estimated the
genetic diversity of 96 individuals using 4 SSR markers. The mean observed
heterozygosity was lower than expected, showing an excess of homozygotes,
corroborated by the positive coefficient of endogamy. The genetic diversity
indexes (Fst) and
Nei’s unbiased genetic identity (GI) revealed, in general, moderate genetic
diversity between accessions. The relationship between matrices and progenies
showed that there may be a greater degree of genetic information sharing
between the ABP1 and ABP2 accessions. The Bayesian analysis suggested the
presence of two distinct groups of genotypes (K = 2). These results will
assist future breeding programs and facilitate the conservation of mangaba.