3个不同玉米基础群体及其改良后代遗传变异的SSR分析  

Genetic Variation of Population Improvement by Mass Selection on Three Different Synthesized Maize Groups Based on SSR Data

作　　者：邹超英[1] 杨克诚[1] 潘光堂[1] 荣廷昭[1] 

机构地区：[1]四川农业大学玉米研究所/教育部作物基因资源与遗传改良重点实验室,四川雅安625014

出　　处：《玉米科学》2010年第2期17-22,共6页Journal of Maize Sciences

基　　金：国家"十一五"科技攻关计划子课题(2006BAD13B03);教育部长江学者和创新团队发展计划项目(IRT0453);四川省玉米育种攻关项目

摘　　要：基于微卫星(SSR)标记的遗传参数评估,分析了3个玉米人工合成群体GP3、GP4和GP5及其经2轮、4轮控制双亲混合选择改良后代的遗传变异。结果表明:40对SSR引物在基础群体及其改良后代中共检测到287个多态性位点,每个SSR标记的等位基因数为4～12个,平均7.18个;群体GP3及其改良后代的多态性位点数略高于GP4、GP5及其相应的改良后代,GP3、GP5群体随改良代数增加其多态性位点数呈略增趋势;群体GP3和GP4改良后代的群内遗传相似系数呈渐增趋势,而GP5则变化不大;GP3和GP4的群体基因型数随改良代数增加呈略减趋势,GP5呈略增趋势;GP3群体改良后代的遗传多样性指数变化呈下降趋势,GP4和GP5群体改良后代的变化呈上升趋势;3个群体的群内遗传变异均明显大于群间遗传变异;群体GP3的有效等位基因数为先减后增,GP5为连续略增,GP4呈略减趋势;群体GP3、GP5改良后代的实际基因杂合度和有效基因杂合度无明显变化,而GP4改良后代的变化呈略减趋势。In present study,based on genetic estimate evaluation with microsatellite(SSR) markers,the genetic variation of population improvement by mass selection for two and four cycles on the three synthesized maize groups GP3,GP4 and GP5 were analyzed.Using 40 SSR loci distributed on 10 chromosomes of maize,287 alleles were detected among the groups.At each locus,the number of alleles varied from 4 to 12,with an average of 7.18.The polymorphic alleles in group GP3 and its derivative were a little higher than those...

关 键 词：玉米 遗传多样性 混合选择 群体改良 SSR 

分 类 号：S51[农业科学—作物学]