生物多样性

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江苏省稻瘟病菌的毒性多样性及水稻品种的抗病性

陆凡,郑小波,陈志谊,刘永锋,王法明,范永坚   

  1. 1 (南京农业大学农业部病虫监测与治理重点开放实验室,  南京 210095)
    2 (江苏省农业科学院植保所,  南京 210014)
  • 收稿日期:2001-04-09 修回日期:2001-06-04 出版日期:2001-08-20 发布日期:2001-08-20
  • 通讯作者: 陆凡

Pathotype diversity of Magnaport he grisea and resistance of rice cultivars to the pathogen in Jiangsu Province

LU Fan1 ,2 , ZHENG Xiao-Bo1 , CHEN Zhi-Yi2 , LIU Yong-Feng2 , WANG Fa-Ming2 , FAN Yong-Jian2   

  1. 1 Key Lab of Monitoring and management of Plant Disease and Insects , Ministry of Agricul tureNanjing Agricultral University , Nanjing  210095
    2 Institute of Plant Protection , Jiangsu Academy of Agricultural Sciences , Nanjing  210014
  • Received:2001-04-09 Revised:2001-06-04 Online:2001-08-20 Published:2001-08-20
  • Contact: LU Fan

摘要:

在13个已知日本抗病基因品种上检测1997~1999年采集自江苏省吴江、赣榆、通州、高邮和 宜兴等5个代表地区的324个稻瘟病菌株的毒性,结果可将上述菌株划分为90种毒性类型,表 明江苏省稻瘟病菌存在着丰富的毒性多样性。毒性类型组成在地区间存在较大的差异,并且 随着时间的推移,稻瘟病菌毒性类型组成有差异加大的趋势。在已知抗病基因品种上测定江 苏省稻瘟病菌的毒力,结果显示,Pi-ks、Pi-ta、Pi-ta2Pi-sh等抗病基因对江苏省的稻瘟病菌的抗谱很窄,而Pi-i、Pi-z、Pi-ztPi-b等抗病基因的抗谱比较宽 ,可 作为抗源加以利用。用6个代表性毒性类型菌株接种江苏省80个水稻主栽品种和新育成品种 ,品种抗性分析表明,上述水稻品种中的籼稻和杂交稻对江苏省稻瘟病菌具有较高的抗性, 而粳稻品种的抗性较差。上述研究结果为利用水稻品种抗性多样性控制稻瘟病提供了依据。

Abstract:

Three hundred and twenty-four isolates were obtained from rice blast specimens collected from five typical areas —Wujiang , Ganyu , Tongzhou , Gaoyou and Yixing in Jiangsu Province during 1997~1999. The isolates were assessed against 13 Japanese cultivars for which resistance genes have been determined and were divided into 90 pathotypes. This indicated that complex virulence diversity exists in Magnaporthe grisea in Jiangsu Province. The pathotype composition were dissimilar in the five typical areas , and from 1997~1999 , the dissimilarity tended to increase. The analysis of virulence frequency indicated that the resistance genes Pi-ks , Pi-ta , Pi-ta2 and Pi-sh had narrow resistance spect ra to Magnaporthe grisea isolates tested in Jiangsu Province , while the genes Pi-i , Pi-z , Pi-z t and Pi-b had wide resistance spect ra to the pathogen and had value in rice breeding as resources of resistance. Inoculation with six st rains that represent six typical pathotypes of Magnaporthe grisea on 80 major cultivars and newly-bred cultivars of Jiangsu Province showed that most of the Indica cultivars and hybrid rice cultivars tested were resistant and the Japonica rice cultivars were susceptible to the pathogen. The results provide a basis for use of resistance diversity of rice cultivars to control rice blast .