摘要
本文分析了三峡地区１０份玉米地方品种和４份外来种质在１６个同工酶标记位点上的遗传变异。结果表明：１０个地方品种和４个外来种质平均每一位点分别有１．７１和１．７９个等位基因，地方品种中含外来种质所没有的Ｇｏｔ２－６基因，但缺少外来种质中所含有的Ｅｓｔ８－４．５、Ｍａｈ２－５．５和Ｓｏｄｌ－Ｂ３个等位基因，地方品种中６３．１３％的检测位点为多态性，期望杂合度为０．１９１９，地方品种与外来种质间基于１６个位点所估算的ＭＲＤ值在０．１４８～０．３９１之间，地方品种间ＭＲＤ值在０．１１０～０．４４４之间，说明地方品种间遗传差异较大，地方品种内遗传变异丰富。
Ten local varieties(Lanhuazao,Wuxiyumil3, Wuxiyumil4 ,Roulihuang,Xiaomeihuang,Zhuxiyumi,Yinxinhuang,Jingzihuang,Qiyuehong and Hongtianhua) colleted from the Three Gorges area and four exotic populations(BSSSC9,Lancaster,Suwen2,Meihuang9)in maize(Zea mays L.)were assayed for a allozyme variation at 16 enzyme locus.Extensive allozyme variablility was observed in all studied materials.No locus was monomorphic over all material.Each of the loci Adhl,Amyl,Cox2,Cox3,Estl,Est8,Got1,Got2,Mdh2,Mdh3,Pox4,Sod1,Sod4 expressed two allozymes.Acpl and Mdhl each had three allozymes present.Acp4 had four allozymes present.1.71 and l.79 alleles per loci were presented within per local variety and exotic populations respectively.Got2-6was presented within ten local varieties but was not discovered in exotic populations;Est8-4.5,Mdh2-5.5 and Sod 1-B were observed in four exotic populations but were not found in local varieties.The proportion of polymophism loci of local varieties ranged from 50%to 68.75%,having a mean value of 63.13%.The average expected heterozygosity was 0. 1919.MRD(Modified Rogers,Distance)based on 16 locus had revealed the genetic difference among local varieties(0.148～0.391)and between local varieties and exotic populations(0.118～0.444).
出处
《华中农业大学学报》
CAS
CSCD
北大核心
1995年第4期322-326,共5页
Journal of Huazhong Agricultural University
基金
国际科学基金
国家自然科学基金
关键词
玉米
地方品种
同工酶
遗传多样性
mazie(Zea mays L.)
local variety
allozyme polymorphism
