云南粳稻栽培品种的稻瘟病垂直抗性分类及鉴别菌系选择的初步研究

CLASSIFICATION OF VERTICAL RESISTANCE TO BLAST IN YUNNAN KENG RICE AND SELECTION OF DIFFERENTIAL STRAINS OF THE DISEASE

1983～1989年对云南粳稻品种进行了稻瘟病垂直抗性基因型的鉴定研究。通过对1000余份云南菌株的鉴定和稳定性选拔,初筛了一套适合于粳稻品种的鉴别菌系,用此鉴别菌系接种227个云南粳稻栽培品种进行垂直抗性分类,结果可划分为Ⅰ—Ⅶ群,18个型。属I—1、Ⅱ—1、Ⅲ—1、Ⅳ—1、V—1型的品种分别持+、P_i—a、P_i—i、P_i—k、P_i—km基因,共177个品种,占78％。除Ⅵ—1、Ⅶ—1、Ⅶ—2,Ⅶ—3型外,各群其它类型的品种可能还持有其它的抗性基因。 另外,用日本鉴别菌系接种的结果虽然可划分为A—J群,但日本菌株对许多品种的反应不明确,获得的信息量少,推定不明的品种约占65％。

Rice blast vertical resistance genotypes of Yunnan Keng (Japonica) rice were identified during 1983-89.After over 1000 samples of Yunnan blast strains had been identified and their stability selected, a set of differential strains suitable for keng rice breeding were Preliminarily screened out. Using them to inoculate 227 cultivars of Yunnan Keng rice and make a classification of vertical resistance of these cultivars, the cultivars could be divide into Ⅰ-Ⅶ groups, 18 types, Ⅰ-1, Ⅱ-1, Ⅲ-1, Ⅳ-1,Ⅴ-1 cultivars containing + , Pi-a, Pi-i, Pi-k, Pi-km genes respectively, numbered 177, accounting for 78% of the inoculated cultivars. With exception of Ⅵ-1, Ⅶ-1, Ⅶ-2, Ⅶ-3, the rest cultivar types may contain genes resistant to other diseases. In addition, inoculated with Japanese differential blast strains, the cultivars can be divided into A-J groups, but the responses of many of these cultivars were not definite. About 65% of the cultivars were less informative, and it is difficult to determine their resistance.