采用水平淀粉凝胶电泳技术对分布于湖南八面山的濒危植物银杉(cathaya argyrophylla Chun etKuang)的遗传多样性和群体分化进行了初步研究。对13个酶系统25个等位酶位点的检测表明,该地区的银杉林群体遗传变异水平很低,多态位点比率 P=0...采用水平淀粉凝胶电泳技术对分布于湖南八面山的濒危植物银杉(cathaya argyrophylla Chun etKuang)的遗传多样性和群体分化进行了初步研究。对13个酶系统25个等位酶位点的检测表明,该地区的银杉林群体遗传变异水平很低,多态位点比率 P=0.28,等位基因平均数 A=1.36,平均期望杂合度He=0.100;但3个小群体间存在着明显的遗传分化,基因分化系数高达G_ST=0.26,明显不同于其它裸子植物的报道。八面山银杉林低水平的遗传变异和明显的群体分化,一方面反映了银杉的古老性和残遗性,另一方面也说明在银杉的进化过程中可能发生了严重的遗传漂变,而且群体之间的基因流明显受阻。展开更多
Genetic diversity and differentiation of four natural populations of \%Quercus mongolica \%in Northeast China were studied with the method of RAPD.Through the amplification with 48 random primers,344 repeatable loci w...Genetic diversity and differentiation of four natural populations of \%Quercus mongolica \%in Northeast China were studied with the method of RAPD.Through the amplification with 48 random primers,344 repeatable loci were detected and 245 loci were polymorphic.Percentage of polymorphic loci was 71.22%.According to the measurement of Shannon index,genetic diversity of \%Quercus mongolica\% was on relative high level and genetic variation mainly distributed within population (64.50%).In the studied populations of \%Quercus mongolica,\%the level of genetic diversity of OLJ was the highest,that of OHH was the lowest, and that of OSZ and OHL were the middle.The average genetic distance within populations was 0.0962 ,that among populations was 0.1290.Abundant genetic diversity of Quercus mongolica assured the steady existence and development of its populations.展开更多
文摘Genetic diversity and differentiation of four natural populations of \%Quercus mongolica \%in Northeast China were studied with the method of RAPD.Through the amplification with 48 random primers,344 repeatable loci were detected and 245 loci were polymorphic.Percentage of polymorphic loci was 71.22%.According to the measurement of Shannon index,genetic diversity of \%Quercus mongolica\% was on relative high level and genetic variation mainly distributed within population (64.50%).In the studied populations of \%Quercus mongolica,\%the level of genetic diversity of OLJ was the highest,that of OHH was the lowest, and that of OSZ and OHL were the middle.The average genetic distance within populations was 0.0962 ,that among populations was 0.1290.Abundant genetic diversity of Quercus mongolica assured the steady existence and development of its populations.
