江苏省“十五”前后主栽粳稻品种纹枯病抗性评价

Disease resistance evaluation to sheath blight of commercialized japonica rice cultivars around tenth five-year plan in Jiangsu province

对江苏省"十五"前后主栽的64个常规粳稻品种进行2年纹枯病抗性接种鉴定。结果表明:参试品种纹枯病发病程度及趋势在年度间、同年度重复间表现一致;早、中熟晚粳品种对纹枯病抗性相对较好,其次是迟熟中粳,中熟中粳品种抗性相对较差;参试品种中没有发现抗病或高度抗病品种,8个中抗品种分布于不同生育期类型。对水稻抗纹枯病鉴定方法和评价标准以及抗纹枯病育种相关问题进行了讨论。

Sheath blight（SB） resistance of 64 commercialized japonica rice cultivars around Tenth Five-year Plan in Jiangsu Province were evaluated by using artificial inoculation in a two-year test.The consistent trend of SB development and severity within tested cultivars were found between years and between replications in each year.Totally,the cultivars with shorter whole-growth-stage（Zhong-Shu Zhong-Jing-Dao） had lowest resistance,and the cultivars with longer whole-growth-stage （Zao-Zhong-shu Wan-Jing-Dao） showed relatively higher SB resistance than that of medium whole-growth-stage（Chi-Shu Zhong-Jing-Dao）.In a ＇0-9＇ rating scale system,no cultivars reached resistant and high resistant levels.Eight cultivars with moderate resistance level distributed in different whole-growth-stage groups.Furthermore,identifying methods and rating criterions in evaluation of SB resistance,and other problems associated with SB resistant breeding were discussed in this paper.