Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil
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2020
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Given its high-valued wood, the African mahogany (Khaya grandifoliola) has been envisaged as a renewable source of
tropical hardwoods in Brazil. However, there are concerns about the hypothesized low diversity among the few K.
grandifoliola germplasm sources introduced in the country. Using eight microsatellite markers, we evaluated the genetic
diversity and divergence among 53 superior trees selected from three provenances of K. grandifoliola located in
the state of Pará. These populations are among the oldest plantations (>15 years) in Brazil and, therefore, the country’s
main seed sources. The average number of alleles per locus was 5.9, expected heterozygosity was moderate
(HE=0.56) and lower than the high observed heterozygosity (HO=0.74). Therefore, the intrapopulation fixation index was
negative (f=-0.31) indicating the possibility that selection of superior trees might have favored heterozygous plants with
heterosis. No genetic structure was observed between provenances. The genetic diversity observed within selected
trees, with an effective population size (Ne) of 30.4, is comparable to that of natural populations of African and Brazilian
mahoganies. Therefore, our results contradict the idea that the genetic diversity of K. grandifoliola introduced in Brazil is
low and show that our germplasm can be exploited for breeding purposes.
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Microsatellites, SSR, Genetic structure, Genetic divergence, Hardwood
Citação
SOARES, Sabrina Delgado et al. Genetic diversity in populations of African mahogany (Khaya grandioliola C. DC.) introduced in Brazil. Genetics and Molecular Biology, Ribeirão Preto, v. 43, n. 2, e20180162, 2020. DOI: 10.1590/1678-4685-GMB-2018-0162. Disponível em: https://www.scielo.br/j/gmb/a/zNFjG7GkVBXJMNNRTymg9Rt/?format=pdf&lang=en. Acesso em: 25 jan. 2023.