Genetic diversity and structure in natural populations of Cajui from Brazilian Cerrado

Authors

DOI:

https://doi.org/10.14393/BJ-v37n0a2021-53974

Keywords:

Anacardium, Conservation, Genetic resources, Population structure

Abstract

Cajui (Anacardium spp.) is a native fruit tree (small cashew) of the Brazilian Cerrado and possesses the potential for commercialization. However, cajui exploitation occurs exclusively through extractivism in the absence of conservation strategies. The lack of conservation strategies may lead to a decrease in genetic diversity of Anacardium. In this work, the genetic diversity and population structure of three natural populations in Sete Cidades National Park (PNSC; PI, Brazil) were assessed using ISSR analysis of 56 cajui accessions and two A. occidentale accessions (outgroup) from Pacajus (CE, Brazil). A total of 112 markers were obtained, 93 (83.04%) of which were polymorphic. The diversity indices of these populations indicated moderate levels of genetic diversity. According to AMOVA, 96.17% of the genetic variability lay within populations, with low genetic differentiation among populations (ΦST = 0.03828). Furthermore, STRUCTURE analysis indicated the existence of four connected genetic groups. The findings show that the individuals from the three collection sites did not represent different subpopulations, likely due to the high gene flow (Nm = 6.7) favored by the floral biology of Anacardium, pollinators and small-animal seed dispersers. This research identifies genetically divergent individuals (C-03, C-05, C-22, C-26, C-34 and C-39), which should be considered priority individuals for conservation and can inform conservation programs for Anacardium spp.

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Published

2021-12-29

How to Cite

DA COSTA GOMES, M.F.., NAZARÉ COSTA BORGES, A.., SARAH SALES BATISTA, G.., DE ANDRADE LUZ, G.., ALENCAR OLIVEIRA, M.E.., DE ALMEIDA LOPES, Ângela C.., FERREIRA DE ARAÚJO, A.S.., FERREIRA GOMES, R.L.., BARROS BRITTO, F.., SARMANHO DA COSTA LIMA, P.. and EMÍLIO DOS SANTOS VALENTE, S., 2021. Genetic diversity and structure in natural populations of Cajui from Brazilian Cerrado. Bioscience Journal [online], vol. 37, pp. e37080. [Accessed14 August 2022]. DOI 10.14393/BJ-v37n0a2021-53974. Available from: https://seer.ufu.br/index.php/biosciencejournal/article/view/53974.

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Agricultural Sciences