水稻抗稻瘟病鉴定中的几个相关问题的探讨  

Some Issues on Identification of Rice Blast Resistance

作　　者：何月秋[1] Hei Leung Robert S.Zeigler 唐文华[3] 

机构地区：[1]云南农业大学植物保护学院,云南昆明650201 [2]国际水稻研究所昆虫与植病系 [3]中国农业大学植物病理系,北京100094

出　　处：《云南农业大学学报》2003年第3期234-238,共5页Journal of Yunnan Agricultural University

基　　金：国际水稻所生物多样性控制稻瘟病项目;国家863项目(2001AA211061;2002AA241311);云南省后备人才基金项目(99C10010R)。

摘　　要：利用CO39近等基因系及其累加系和4个稻瘟病菌的原始菌株及其突变体,研究稻瘟病抗性鉴定中经常考虑的几个因子。结果表明,接种孢子量与植株的病级、病斑数和发病叶面积呈正相关,品种对混合菌株接种的抗病性主要取决于致病性强的菌株,弱菌株的诱导抗性有限,过量施用氮肥可使部分抗病品种感病,被克服的主效基因没有明显的残效抗性。Some issues on identification of rice blast resistance were studied by using CO39 nearisogenic and pyramid lines and 4 original isolates and their mutants of Magnaporthe grisea. The results were very useful to blast resistance breeding: that spore number for inoculation was significantly positive correlated to score, lesion number and diseased leaf area, resistance of a line to mixed spore suspension depended on the compatible isolate and induced resistance by incompatible isolate was very limited, much nitrogen application made resistant line susceptible and residual resistance did not appear among the defeated major resistance genes. 

关 键 词：水稻 稻瘟病 抗性鉴定 近等基因系 氮肥 过量施肥 抗病育种 

分 类 号：S435.111.4[农业科学—农业昆虫与害虫防治] S511[农业科学—植物保护]