TY - JOUR AU - de Moraes, Pedro L. R. AU - Monteiro, Reinaldo AU - Vencovsky, Roland PY - 2002/06/01 Y2 - 2024/03/28 TI - Genetic differentiation and diversity of natural populations of Cryptocarya spp. (Lauraceae) from the Brazilian Atlantic rain forest JF - Lundiana: International Journal of Biodiversity JA - Lundiana VL - 3 IS - 2 SE - Artigos DO - 10.35699/2675-5327.2002.21803 UR - https://periodicos.ufmg.br/index.php/lundiana/article/view/21803 SP - 99-109 AB - <p lang="en-US" style="margin-bottom: 0cm; font-weight: normal; line-height: 100%;" align="justify"><span style="font-family: Times New Roman, serif;"><span style="font-size: medium;">The genetic variability and structure of ten populations of <em>Cryptocarya </em>spp. (Lauraceae) were investigated by means of isozymes. Leaf samples of adult individuals of <em>C. aschersoniana</em>, <em>C. moschata</em>, and <em>Cryptocarya </em>sp., from two regions of São Paulo state, Brazil, were collected. Seeds from 35 families of <em>C. moschata </em>and juveniles of three populations from diaspores dispersed by “muriquis”, <em>Brachyteles arachnoides </em>(Primates - Cebidae), were also collected. From twenty loci analysed, the expected average heterozygosity of progenies, juveniles, and adults of <em>C. moschata </em>was respectively 0.313, 0.227, and 0.351, whereas it was 0.258 and 0.393 for <em>C. aschersoniana </em>and <em>Cryptocarya </em>sp., respectively. Results indicated that a greater variability occurred within populations for all categories analysed. For adult populations of <em>C. moschata</em>, the divergence obtained through GST estimates suggests the existence of significant genetic drift and/or natural selection effects between regions. The level of gene differentiation (GST = 0.107) was relatively high, and comparable to what would be expected for groups of plants having a half-sib family structure in a single generation. For juvenile populations, the genetic differentiation was also high (GST = 0.084). This could be explained by differential feeding behaviour of “muriquis” within their home range, allied to the distance among sites of seed dispersion. Nei’s average genetic distance (<em>D</em>) between pairs of <em>C. moschata </em>adult populations was 0.07, indicating again a pronounced genetic differentiation. Present values obtained from isozymes support morphological and wood anatomy evidences that <em>C. moschata </em>and <em>C. aschersoniana </em>are closely related species.</span></span></p> ER -