期刊论文

Virulence of Magnaportheoryzaeto 24 blast resistance genes in rice from the disease nursery at Taojiang,Hunan

中文

植物保护

0529-1542

2017

43

3

165-170

10.3969/j.issn.0529-1542.2017.03.028

201203014:公益性行业(农业)科研专项 0904:湖南省重点学科建设项目(十二五)

本校为第一机构

稻瘟病是水稻生产上的重要病害,了解稻瘟病菌群体毒性组成是水稻抗病品种合理布局的重要基础。2012 -2015年从湖南桃江病圃中不含已知抗瘟基因的水稻品种‘丽江新团黑谷’上成功分离出351个稻瘟病菌单孢菌株,在温室于水稻5叶期采用离体接种法测定了其对24个水稻抗稻瘟病单基因系的毒性,结果表明,病圃中稻瘟病菌以广谱强致病性的菌株为主,病菌对不同抗瘟基因的毒力频率在50.56%~96.67%之间,而不同年度间对24个抗性基因均具毒性的菌株出现频率在0~15%之间。对2015年的每2个抗瘟基因的联合毒力分析表明,基因两两搭配后的联合抗病系数最高、联合致病系数最低的组合是Pi-3*Pi-k (RAC=0.19,PAC=0.43)。...

Rice blast,caused by Magnaporthe oryzae,is one of the most devastating diseases of rice.To understand the virulence composition of the pathogen fungus and hence provide the basis of rational deployment of resistant rice varieties,351 isolates derived from single conidia of M.oryzae were obtained from a widely susceptible variety,i.e.‘Lijiang Xintuan Heigu’ (LTH),planted in the disease nursery at Taojiang,Hunan.The virulence assay was conducted on in vitro segments from the fifth leaves of 24 near-isogenic lines (NILs) of rice carrying single ...