摘要
2011～2014年从江苏省五大水稻种植区采集1 219份水稻稻瘟病标样,分离得到634株单孢菌株,研究分析了江苏省稻瘟病菌种群动态及毒力变化情况。种群动态分析结果显示,江苏省稻瘟病菌共有5群19个生理小种,各水稻栽培区的种群分布差异较大,连云港、徐州和南通稻区,小种类群较为复杂,均出现了5群10个小种,南京、淮安和扬州地区稻瘟病菌种群组成相对简单,其中南京地区出现了4群5个小种,淮安和扬州地区,仅出现3群5个小种和3群4个小种;在分离得到的稻瘟病菌生理小种中,ZG1种群小种出现频率最高,为优势小种。毒力变化分析结果表明,江苏省稻瘟病菌对已知抗性基因Pi-k、Pi-ks、Pi-b和Pi-t的毒力频率较高,对Pi-ta、Pi-ta2、Pi-z和Pi-zt的毒力频率较低,说明Pi-ta、Pi-ta2等抗性基因在江苏省水稻育种上仍具有较高的应用价值,而Pi-k、Pi-ks等抗性基因已不适合在江苏省水稻抗病育种中推广使用。
634 monospore strains of Magnaporthe oryzae were isolated from rice blast disease samples collected from five major rice planting areas in 2011-2014, and the races and vinflence of M. oryzae were studied in Jiangsu province. The M. oryzae population can be classified into 5 groups and 19 races, 5 groups and 10 races in Lianyungang, Xuzhou, and Nantong, and only 4 groups and 5 races in Nanjing, 3 groups 5 races and 3 groups 4 races in Huaian and Yangzhou. ZG1 group was the domi- nant race in Jiangsu province. The virulence frequency of M. oryzea to four resistance genes Pi-ta, Pi-ta2, Pi-z and Pi-z was very low, from 2%-8%, but was relatively high to other four resistance genes P/-k, P/-k, P/-b and P/-t, indicating that the re- sistance genes Pi-ta, Pi-ta2, P/-z and P/-Z are of value for rice breeding in Jiangsu province.
出处
《江苏农业学报》
CSCD
北大核心
2015年第2期285-289,共5页
Jiangsu Journal of Agricultural Sciences
基金
国家科技支撑计划项目(2012BAD19B03)
江苏省农业自主创新基金项目[CX(12)1003-10]
关键词
稻瘟病菌
种群分布
毒力频率
Magnaporthe oryzae
physiologicalrace
virulence frequency
