3个粳稻抗白叶枯病近等基因系的构建

Breeding of Three Near-isogenic Japonic Rice Lines with Major Genes for Resistance to Bacterial-blight

自1989～1996年,选用分别具有抗水稻白叶枯病主效基因Xa 2、Xa 7和Xa 14的3个品种为供体亲本,以一个不携有抗病基因的改良型粳稻品种沈农1033为轮回亲本,通过6次回交、自交直至BC_6F_4代,经各世代抗性和农艺性状筛选,转育成3个粳型抗白叶枯病近等基因系(NIL),命名为CBB2、CBB7和CBB14。这些NIL除所带不同的抗病基因外,其生育期、株高、分蘖力、穗型大小等农艺性状与轮回亲本基本相似。经抗病反应型检测、遗传分析、育种及分子标记应用,初步证明这些NIL具有良好的实用价值。

Three major resistant genes to bacterial blight (BB), Xa2, Xa 7, and Xa 14 from donor varieties were incorporated into a japonica cultivar, Shennong 1033 used as recurrent parent with improved plant type and without resistant gene, respectively. Near-isogenic lines were developed by backcrossing and selfing until BC6F4 generation during 1990~1996.