野生西瓜种质PI296341-FR抗枯萎病菌生理小种2的遗传规律  

Inheritance of Resistance to Race 2 of Fusarium oxysporum f.sp.niveurm in Watermelon Wild Germplasm PI296341-FR(Citrullus lanatus var.citriodes)

作　　者：邹小花[1,2] 张海英[2] 李胜[1] 耿丽华[2] 宫国义[2] 任毅[2] 许勇[2] 

机构地区：[1]甘肃农业大学生命科学技术学院,兰州730070 [2]北京市农林科学院蔬菜研究中心,北京100097

出　　处：《园艺学报》2011年第9期1699-1706,共8页Acta Horticulturae Sinica

基　　金：北京市科委项目(Z09090501040902;D08070500690803);北京市自然科学基金重大项目(5100001);国家现代西瓜甜瓜产业技术体系项目(CARS-26);国家科技支撑计划项目(2009BADB8B02);国家自然科学基金项目(30972015);国家‘863’计划项目(2010AA10A107)

摘　　要：以抗枯萎病的野生西瓜种质PI296341-FR和高度感病的高品质西瓜自交系97103为亲本杂交,获得P1,P2,F1,B1,B2,F2等6世代及RILs（F2S8）永久分离群体。采用植物数量性状主基因＋多基因混合遗传模型,进行6世代联合分析和RILs（F2S8）联合分析,探讨PI296341-FR对西瓜枯萎病菌生理小种2的抗性遗传规律。6世代分析结果表明,对生理小种2的抗性遗传符合1对加性主基因＋加性—显性多基因遗传模型,主基因遗传率在B1,B2和F2群体中分别为31.8%,23.4%和48.6%,加性效应为0;多基因遗传率为16.5%~43.9%,加性效应为2.24,显性效应为-0.75。RILs（F2S8）联合分析显示,对生理小种2的抗性遗传符合3对连锁的等加性主基因遗传模型,主基因遗传率为66.2%,加性效应-0.51,主基因间重组率0.16。两种遗传模型分析结果显示：PI296341-FR对西瓜枯萎病菌生理小种2的抗性遗传由主基因和微效基因共同控制,微效基因加性效应与显性效应的绝对值均高于主基因。RILs（F2S8）populations and six generations（P1,P2,F1,B1,B2,F2）derived from a cross of PI296341-FR（resistant） and 97103（susceptible）were used to investigate the inheritance of resistance to race 2 of Fusarium oxysporum f.sp.niveurm.Using the mixed model of major gene plus polygene,the resistance to race 2 of Fusarium oxysporum was showed to fit one pair of additive-major genes plus additive-dominant polygene model（D-2 model）.In B1,B2 and F2 populations,the heritability of major genes with recessive effect was estimated to be 31.8%,23.4% and 48.6% respectively,and thepolygene heritability ranged from 16.5% to 43.9%.Meanwhile,three linkage major genes with equal additive effect（F-3）were found to govern the inheritance of resistance to race 2 in the RILs（F2S8） populations,and the inheritance of major genes was estimated to be 66.2%,additive effect was-0.51.The recombinant rate between three major genes was about 0.16.This result indicated that the resistance to race 2 of Fusarium oxysporum in PI296341-FR was controlled by both major and minor genes,and the cumulative value for additive and dominant effects of minor genes were respectively higher than that of major genes.

关 键 词：西瓜 西瓜枯萎病 生理小种2 抗性 遗传规律 

分 类 号：S651[农业科学—果树学]