水稻白叶枯病的抗性遗传及其在杂交后代选择效果的研究  

STUDIES ON INHERITANCE OF RESISTANCE TO BACTERIAL BLIGHT AND ITS SELECTION EFFECT WITHIN HYBRID PROGENIES IN RICE

作　　者：王润华[1] 卢永根[1] 

机构地区：[1]华南农业大学农学系

出　　处：《华南农业大学学报》1995年第1期1-6,共6页Journal of South China Agricultural University

基　　金：广东省自然科学基金

摘　　要：研究了玻璃占、辐竹２选、矮澄辐２号及辐包矮１号等４个华南籼稻品种的白叶枯病抗性遗传。结果表明：供试品种的抗性属多基因遗传，控制单株平均病斑长的最少基因数ｋ＝５；广义遗传力的平均ｈｂ２＝７８．５９％；在入选率为０．０５的条件下，对单株平均病斑长作负向选择，遗传进度的平均△Ｇ＝－５．３７６±０．９０３（ｃｍ）；４个抗／感组合的Ｆ２均出现抗性超亲的个体，平均出现率为４．２４％；以不同组合Ｆ２的超亲个体相互杂交定向选择至Ｆ３，多数组合内抗性基本稳定，选择效果比抗／感单交组合好。The inheritance of resistance to bacterial blight(Xanthomonas campestris pv.oryzae)of four hsien(indica)rice cultivars, Bolizhan,Fuzhu No.2 selection,Aichengfu No.2 and Fubaoai No.1,originated from South China,has been studied,Results show that the resistanee of all cultivars tested are controlled by polygene.The mini-mum numbers of genes which govern inheritance of mean leaf lesion length of single plant are K=5.Heritability in broad sense hb2=78.59% on an average.Under the condition of 0.05 selected rate,the negative direct ional selection of mean leaf lesion length/plant has been made and mean genetic advance △G0.05=-5.376 ± 0.903(cm).All F2 population of four R/S crosses appear transgressive individuals and the mean rate of occurrence is 4.24%,Reciprocal crosses among F2 transgressive individuals of various crosses has been made and directional selection would be carried out till F3.The resistance of most families are stable.The selection effect is better than R/S sin-gle cross.

关 键 词：水稻 白叶枯病 抗性遗传 选择效果 

分 类 号：S435.111.4[农业科学—农业昆虫与害虫防治] Q348[农业科学—植物保护]