抗稻瘟病新种质R_(917)的抗瘟基因遗传分析及其转育研究

BLAST RESISTANT GENE ON RICE MUTANT R 917 AND ITS TRANSLATION

Ｒ９１７是一个抗瘟性强、抗谱广、兼抗细菌性条斑病、农艺性状优良的抗病水稻新种质。经抗瘟性遗传分析，Ｒ９１７对ＺＢ１３、ＺＣ１５、ＺＥ３等稻瘟病小种的抗性受１对显性基因控制（其Ｆ２产生３∶１抗感分离），并与亲本城特２３２和秀水３７非等位。经日本７个鉴别菌系及我国的ＺＣ１５、ＺＥ３小种测定，Ｒ９１７均表现为高抗反应。经与城堡１号等位性测定，Ｒ９１７与城堡１号非等位，也有别于日本报道的１４个抗瘟基因。经与秀水８６１等品种杂交，发现Ｒ９１７的抗瘟性易转育、易利用，并在抗瘟基因转育时，未见其它不良性状伴随发生。目前，Ｒ９１７已被省内外１０余家育种单位在水稻育种上利用。

R 917 is a new rice variety with strong blast disease resistance. The resistance genes of R 917 and its parents,Chengte 232 and Xiushui 37, were analysed with blast races of Pyricularia oryzae ZB 13 , ZC 15 and ZE 3. The results showed that only one dominant gene controlled the resistance to the three blast races in R 917 . Allelism test indicated that the resistant gene of R 917 was nonallelic with its parents. The blast resistance was tested by inoculating with 7 Japanese strains.R 917 was highly resistant to the all. The allelism test also indicated that the resistant gene of R 917 was nonallelic with Toride 1. The reaction with some strains between R 917 and Toride 1 indicated that the blast resistant gene of R 917 is different with the 14 genes that was reported in Japan. The identification of the disease resistance for the progenies of R 917 crosses with XS861 showed that R 917 could be used as a good material for resistance to rice blast in rice breeding.