Departamento de Ciências Biológicas e da Terra, Universidade Federal de Alfenas, Rua Gabriel Monteiro da Silva, 714 Centro, 37130-000 Alfenas, MG, Brazil.
Biochem Genet. 2010 Apr;48(3-4):215-28. doi: 10.1007/s10528-009-9311-x. Epub 2009 Nov 26.
Two species, Psychotria tenuinervis (shrub, Rubiaceae) and Guarea guidonia (tree, Meliaceae), were used as models to compare the genetic structure of tree and shrubby species among natural edges, anthropogenic edges, and a fragment interior. There were significant differences between two genetic markers. For isozymes, P. tenuinervis presented greater heterozygosity (expected and observed) and a higher percentage of polymorphic loci and median number of alleles than G. guidonia. For microsatellites, there was no difference in genetic variability between the species. Only P. tenuinervis, for isozymes, showed differences in genetic variability among the three habitats. There was no genetic structure (F (ST) < 0.05) among habitats in both plant species for both genetic markers. Isozymes showed great endogamy for both plant species, but not microsatellites. The forest fragmentation may have negative effects on both spatial (among edges and interior) and temporal genetic variability.
两种物种，Psychotria tenuinervis（灌木，茜草科）和 Guarea guidonia（树，楝科），被用作模型来比较自然边缘、人为边缘和片段内部的树状和灌木状物种的遗传结构。两种遗传标记存在显著差异。对于同工酶，P. tenuinervis 表现出更高的杂合度（预期和观察）和更高比例的多态性位点以及中数等位基因数，而 G. guidonia 则不然。对于微卫星，两种物种的遗传变异性没有差异。只有 P. tenuinervis，对于同工酶，在三种生境中表现出遗传变异性的差异。对于两种遗传标记，两种植物在生境之间均没有遗传结构（F (ST) < 0.05）。同工酶显示出两种植物的高度自交，但微卫星则不然。森林破碎化可能对两种植物的空间（边缘和内部之间）和时间遗传变异性都有负面影响。
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