水稻新品种(系)对褐飞虱抗性的筛选及评价

Resistance Screening and Evaluation of Newly-Bred Rice Varieties (Lines) to the Rice Brown Planthopper, Nilaparvata lugens

采用改进的苗期集团筛选法,测定了1999～2002年国家和浙江省水稻育种攻关项目的769个水稻新品种(系)对褐飞虱的抗性反应。结果表明,在769个品种中筛选出抗级为0～5级的品种93个,其中长持抗期(LD)、中持抗期(MD)和短持抗期(SD)级的品种分别有3、13、77个。同时对1999～2000年和部分2001年苗期抗级为0～5级的47个水稻品种进行成株期持抗期鉴定,发现苗期与成株期LD、MD、SD相一致的品种分别有3、3、15个;苗期为SD、成株期为MD的品种有3个,成株期无持抗期的品种有21个;苗期为MD、成株期为SD的品种有3个。试验进一步表明,利用水稻苗期和成株期的受害级别(5级)和持抗期长短(MD～LD)来评价耐褐飞虱水稻品种是一种比较可行的方法。

Resistance of 769 newly-bred rice varieties or lines（1999-2002） to the brown planthopper （BPH） （Nilaparrata lugcns） was evaluated using the Modified Seedbox Screening Technique （MSST）. Among the tested rice varieties, 93 varieties had resistance to BPH, of which 3, 13, 77 varieties had long-, middle- and short durable resistance respectively at seedling stage as TNl（check） was graded 9. Meanwhile, the resistance levels of the 47 resistant varieties tested were further evaluated at adult stage. There were 3, 3, 15 varieties expressed long-, middle- and short durable resistance at adult stage respectively with the same tendency as those at seedling stage. Twenty four short-durable （SD） resistant varieties at seedling stage had three middle-durable （MD） and 21 no durable resistance at adult stage respectively, and three MD resistance varieties at seedling stage expressed SD resistance at adult stage. It is an effective method for evaluating tolerance levels of rice varieties to BPH using damage （grade 5） and durable resistance level （MD to LD） at seedling and adult stages.