Different Hypotheses for Resistance Loss of Rice Varieties to Magnaporthe oryzae  

作　　者：Zhao Kehan Huang Shiwen 

机构地区：[1]China National Rice Research Institute,Hangzhou 310006,China

出　　处：《Rice science》2021年第1期11-12,共2页水稻科学（英文版）

基　　金：the Key Research and Development Project of Zhejiang Province,China(Grant No.2019C02018);the National Key Research and Development Projects of China(Grant Nos.2016YFD0200801 and 2018YFD0200304);Innovation Project of Chinese Academy of Agricultural Sciences(Grant No.CAAS-ASTIP-2013-CNRRI).

摘　　要：It is widely believed that a rice variety loses its resistance to rice blast after three to five years in commercial production due to the emergence of new Magnaporthe oryzae pathotypes(or physiological races)(Ou,1985).However,we believe that a resistant rice variety loses its resistance to M.oryzae not due to the emergence of new physiological races.We propose that pathogenic physiological races already exist in the natural environment,serving as potential physiological races.It is only because of the lack of appropriate environmental conditions,particularly the lack of a suitable rice host,on which such a race is unable to propagate widely and exists as an inferior race.However,when there is an appropriate rice host,the potential pathogenic physiological race can quickly proliferate to become the dominant physiological race,thus leading to the loss of blast resistance in resistant rice varieties.

关 键 词：MAGNAPORTHE RESISTANCE PHYSIOLOGICAL 

分 类 号：S435.111.41[农业科学—农业昆虫与害虫防治]