福建中、晚稻主栽品种(组合)抗瘟性研究

Resistance of the leading varities of middle and late rice in Fujian to rice blast disease

对福建省 2 3个中、晚稻主栽品种进行了两年苗期人工接种和在病区 4个鉴定点采取田间自然诱发对叶瘟和穗颈瘟的鉴定 ,综合评定为中抗以上的品种有荆糯 6号、汕优 10号、特优 689、汕优 70、特优 70、汕优明 86等 6个品种 ;根据抗谱分析 ,汕优 10号抗性最强、抗谱最广 ,其次为荆糯 6号、特优 689,后 3个品种抗性较弱 ,抗谱较窄。文中对 2 a抗性鉴定不一致的品种以发病重的一年代表该品种的抗性作了论证 ;分析了 2 a抽穗期降雨日数基本相同而穗颈瘟发病情况却不同的原因 ,讨论了汕优多系

Twenty\|three leading varieties of middle and late rice in Fujian were artificially inoculated in seedling stage and naturally induced with leaf and neck blast in the four identifying nursery.The resistance to rice blast disease were evaluated in heading stages. After two years' test,6 varieties showed to be equal or stronger than moderate resistance to blast disease.These varieties were Jingnuo 6, Shanyou 10,Teyou 689,Shanyou 70,Teyou 70 and Shanyouming 86 As for the inconsistent results of two years' resistant identification,the proofs why the year with more serious disease being chosen to stand for the resistance of varieties had been given in this paper.The reason of different disease level of neck blast at heading stage in the almost same rain days of two years had also been analyzed. The reason of resistant variation of Shanyouduoxi 1 and the way to continuously breed new resistant varieties were discussed.