鹤山人工林大叶相思种群遗传结构的AFLP分析

AFLP analysis on genetic structure of planted Acacia auriculiformis population in Heshan.

AFLP分析种源相同、栽种时间相同的不同群落中的大叶相思种群 .结果表明 ,其杂合度在纯林中最高 ,豆科混交林次之 ,非豆科混交林中最低 .种群遗传多样性主要分布在种群内 ,达 90 .73% ,不同种群间仅为9 2 7% .纯林与豆科混交林的大叶相思两种群间遗传结构关系较远 ,纯林与非豆科混交林种群间遗传关系较近 ,豆科混交林与非豆科混交林种群间遗传关系居中 .表明人工林大叶相思种群总的遗传变化水平较高 ,但其遗传分化并非基因流作用所致 ,而是受人工选育与环境变化的影响 .

AFLP analysis of Acacia auriculiformis populations in 3 different planted communities with the same provenance and same planting time indicated that the genetic heterozygosity was quite high in the plantation population.90.73% of total genetic variance distributed within a population,while only 9.27% among populations.The most distinct genetic structural difference was found between pure plantation and legume mixed plantation,next was between legume and non-legume mixed plantation,and the most similar was between pure and non-legume mixed plantation,which revealed that the genetic variation in this Acacia auriculiformis population was relatively higher than that from the natural forests by isoenzymic analysis data.The genetic differentiation was not the result of gene flow,but the result of the artificial selection and the microenvironmental changes.