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Allozyme Variation and Population Genetic Structure of Betula alnoides from Guangxi, China

机译：广西白桦的同工酶变异和种群遗传结构

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摘要

Allozyme variation and population genetic structure of Betula alnoides Buch. Ham. ex D. Don in 11 natural populations from Guangxi Zhuang Autonomous Region, China, were investigated by starch gel electrophoresis. Variation at 15 loci from 10 enzyme systems was analyzed. Allozyme analysis revealed a high level of genetic variation in this species, with percentage of polymorphic loci (P p ), the average number of alleles per locus (A p ), and the expected heterozygosity (H ep ) being 55.2%, 2.0, and 0.204, respectively, which exceeds the average level among out-crossing wind-pollinated woody species at the population level. At the species level, P s , A s , and H es were 60.0%, 2.67, and 0.206, respectively.The observed heterozygosity (H op ) was higher than H ep , indicating the existence of natural selection against homozygotes. The negative fixation index (F = −0.216) implied a significant excess of heterozygosity at the population level. Among-population differentiation (F ST ) accounted for 4.0% of the total variation. No significant correlation was detected between the genetic distance and geographic distance among populations. Extensive gene flow was inferred, based on the allozyme data )N m = 6.000 from F ST , N m = 5.605 from the “private allele” method). The results demonstrated that the fragmentation status of B. alnoides had no remarkable effects on the population genetic structure of this species. Some populations are recommended for both in situ genetic conservation and germplasm collection for breeding programs.
机译：西南桦的同工酶变异和种群遗传结构。火腿。通过淀粉凝胶电泳对广西壮族自治区11个自然种群中的ex.D. Don进行了调查。分析了来自10个酶系统的15个基因座的变异。同工酶分析显示该物种的遗传变异水平很高，具有多态性位点（P p ）的百分比，每个基因座的平均等位基因数（A p ）和预期的杂合性（H ep ）分别为55.2％，2.0和0.204，超过了人口水平上交叉风铃传粉木本物种的平均水平。在物种水平上，P s ，A s 和H es 分别为60.0％，2.67和0.206。观察到的杂合度（H op ）较高比H ep 高，表明存在针对纯合子的自然选择。固定指数为负（F = -0.216）意味着在人群水平上杂合度显着过量。群体间差异（F ST ）占总变异的4.0％。在人群之间的遗传距离和地理距离之间未发现显着相关性。根据F ST 的等位酶数据（N m = 6.000，“私有等位基因”方法的N m = 5.605）推断广泛的基因流。结果表明，B。alnoides的片段化状态对该物种的种群遗传结构没有显着影响。建议一些种群同时进行遗传保护和种质收集，以用于繁殖计划。

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