Diversity and genetic structure in natural populations of Geonoma schottiana Mart (arecaceae): implications for conservation

CERNE

Carvalho, Dulcinéia de²  Silva, Mirian de Sousa¹  Vieira, Fábio de Almeida³ 

[1] Universidade Federal de Viçosa, Viçosa, Brasil$$;Universidade Federal de Lavras, Lavras, Brasil$$;Universidade Federal do Rio Grande do Norte, Natal, Brasil$$

关键词: Allozymes;    spatial genetic structure;    genetic conservation.;   

DOI  :  10.1590/S0104-77602011000200006

来源: Universidade Federal de Lavras-UFLA

【 摘 要 】

Geonoma schottiana is an underbrush palm which is found in high densities in tropical forests. This species is known for having an asynchronous fruit producing pattern, over all seasons of the year, thus being an important food source for frugivores. This work aims to determine the diversity and spatial genetic structure of two natural populations, referred to as MC I and MC II, of which 60 individuals were sampled, in Poço Bonito Biological Reserve, Lavras, Minas Gerais state. Results of 10 polymorphic isozyme loci indicated a high genetic diversity for the species (Ĥ_e= 0.428 and Ĥ_o = 0.570), with an mean number of alleles per locus of 2.0. Estimates of Cockerham's coancestry coefficients indicated an absence of intrapopulation (= -0.343) and interpopulation inbreeding (= -0.161), suggesting that on average populations are not endogamous. A high genetic divergence was found between populations ( = 13.5%), in comparison to most tropical species (<5%). Consequently, the estimated historical gene flow was low (m = 0.40). The analysis of spatial distribution of G. schottiana genotypes in MCI revealed a random distribution of genotypes. The high genetic diversity indices found suggest that the populations in question favor in situ genetic conservation, consequently favoring the conservation of riparian environments.

【 授权许可】

Unknown