黄山松群体酶基因遗传变异的研究

应用等位酶分析法，分析了１８个林分群体（小群体）２８０多株黄山松种子胚乳的ＥＳＴ和ＭＤＨ酶的酶基因。结果表明：ＥＳＴ酶受３个基因位点调控，其中２个位占 有等位基因５个、４个，平均为３．５８个；ＭＤＨ酶受４个基因位点调控，其中３个位点各有等位基因３个、５个、５个，平均为２．８１个。基因位点均是多态的。等位基因在群体中的分布不同。ＥＳＴ酶基因位点的平均期望杂合度为０．５６２，ＭＤＨ酶基因位点的平均期望

Study on the Genetic Variation of Enzyme Genes in Pinus Taiwanensis Population

The genetic variation of EST and MDH allozyme genes was studied using isozyme loci analysis of seed endosperms in 18 natural stand population (separate lesser populations) of Pinus taiwanensis from 5 provinces. The results are as follows: EST enzymes are affected by 3 gene loci,two of which have a respective allele of 5 and 4,averaging 3. 58; MDH enzymes are affected by 4 gene loci,3 of which have a respective allele of 3. 5 and 5,averaging 2. 81. Gene loci are polymorphic,and alleies are unevenly distributed in different populations. The average expected heterozy gosity (He) of gene loci in EST enzymes is 0. 562,and that in MDH enzymes is 0. 418,fixation index F is -0. 087,demonstrating a higher proportion of lesser populations composed of heterozygotes;with EST enzyme,genetic distance D is 0. 1729,while with MDH enzymes D is 0. 2934,indicating a 14% of variation and a sharp difference in genetics among lesser populations. 17 populations can be divided into 7 to 8 categories based on D values.