辽宁省水稻主推品种对稻曲病抗性鉴定及评价方法研究  

Resistance Evaluation of Major Rice Cultivars to False Smut Rice in Liaoning Province

作　　者：缪建锟[1] 徐晗[1] 闫晗[1] 杨皓[1] 褚晋 白元俊 董海[1] MIAO Jiankun;XU Han;YAN Han;YANG Hao;CHU Jin;BAI Yuanjun;DONG Hai(Institute of Plant Protection,Liaoning Academy of Agricultural Sciences,Shenyang 110161;Liaoning Rice Research Institute,Shenyang 110101,China)

机构地区：[1]辽宁省农业科学院植物保护研究所,沈阳110161 [2]辽宁省水稻研究所,沈阳110101

出　　处：《东北农业科学》2023年第4期44-50,共7页Journal of Northeast Agricultural Sciences

基　　金：国家重点研发计划项目(2018YFD02002);辽宁省农业科学院院长基金项目(2021MS0502)。

摘　　要：为明确辽宁省水稻主推品种对稻曲病的抗性水平,2019年在田间自然病圃设置3个播期开展45个水稻品种对稻曲病抗性鉴定和评价。结合辽宁稻曲病发生特点,通过对病穗率、病情指数和穗平均病粒数等3个病情评价指标分别进行相关性与回归分析,筛选最适合评价方法。结果表明:不同播期水稻发病程度不同,第2播期水稻发病程度重于其他2个播期;病穗率、病情指数与穗平均病粒数两两均呈线性极显著正相关;供试水稻平均病穗率6.75%,病穗以1个病粒的最多,占46.20%,1~5个病粒的病穗共占92.88%,病穗呈现低病情级别为主的特点,以病穗率作为评价指标更能客观评价品种抗性,并且适合田间操作。抗性评价结果表明,45个主推水稻高抗、抗、中抗、中感、感、高感的品种个数分别为1、5、8、18、7个和6个,整体抗感比例为31.1∶68.9,供试水稻整体抗性水平偏低。To determine the resistance level of major rice cultivars in Liaoning province to false smut rice(FSR).a field study was conducted in 2019,evaluating the resistance of 45 rice varieties to rice blast in three different sowing periods.Based on the characteristics of rice blast occurrence in Liaoning,correlation and regression analyses were performed on three disease evaluation indicators,including panicle infection rate,disease severity index,and average number of diseased grains per panicle,to identify the most suitable evaluation method.The results showed that the severity of rice blast varied among different sowing periods,with the second sowing period exhibiting the highest disease severity.There were significant positive correlations between panicle infection rate and disease severity index,as well as between panicle infection rate and average number of diseased grains per panicle.The average diseased panicle rate of FSR was 6.75%,the maximum number of diseased panicles was 1 diseased grain,with46.20%,and the total number of diseased panicles with 1-5 diseased grains were 92.88%.The diseased panicle reflected low disease index trait,the diseased panicle rate as resistance evaluation method could be more objective and operability.Finally,45 major rice cultivars had 1,5,8,18,7 and 6 cultivars with HR,R,MR,MS,S,HS grade,respectively.The resistance grade between susceptible grade ratio was 31.1∶68.9,the resistance grade of Liaoning rice cultivars to FSR was insufficient.

关 键 词：水稻品种 稻曲病 抗性鉴定 评价方法 

分 类 号：S435.111[农业科学—农业昆虫与害虫防治]