抗稻瘟病（Piricularia oryzae）水稻突变体R917的诱发和筛选研究

STUDY ON THE INDUCTION AND SELECTION OF RICE MUTANT R917 FOR BLAST DISEASE(Piricularia oryzae)RESISTANCE

用６０Ｃｏγ射线１０ｋｒａｄ处理城特２３２／秀水３７Ｆ０代水稻干种子，经稻瘟病病区多代筛选，培育成抗病突变体Ｒ９１７。１９９１、１９９２年经全省９个稻疾病病圃联合鉴定，抗性分别为０．８９和１．０级。１９９２年经太湖稻区搜集的７个稻瘟病菌群中１３８个菌株接种鉴定，Ｒ９１７杭其中１３６个菌株，抗病频率为９８．５５％，双亲对其中的１９个菌株均为感，而Ｒ９１７为抗。试验表明，Ｒ９１７是一个抗稻瘟病强，抗谱广的水稻突变体，可作为水稻品种改良的新抗源。

Rice F0 seeds were treatd with 10 krad of 60Coγ-rays,and blast resistance mutant R917was selected in the following ge nerations;The blast resistance was tested by inoculating themutant with 138 strains of Piricularia ocyzae artificially from nine blast regions in ZhjiangProvince,scale of blast resistance was only 0.89 and 1. 0 in 1991 and 1992 respectively.Therice mutant R917 was resistant to 136 blast fungus strains;The rate of blast resistance forR917 was higher than that of its parents,The mutant is likely to be used in rice breeding forvariety improvment.