水稻分蘖期耐淹能力评价及不同淹涝强度对重要农艺性状的影响

对不同品种水稻分蘖期耐淹能力及不同淹涝强度对一些农艺性状的影响进行了研究,结果表明:(1)淹后叶片相对成活率和茎蘖耐淹能力评分可作为评价水稻分蘖期耐淹能力的指标,供试品种可划分为耐淹、中性、敏感3种类型;(2)随着淹涝强度的增加,淹后株高一般表现出“矮-高-矮”的变化,始穗期推迟时间为:敏感品种>中性品种>耐淹品种,产量性状受影响程度为:敏感品种>中性品种>耐淹品种。

Evaluations of submergence tolerance at tillering stage and effects of different submergence stress on some important agronomic characters in rice

Evaluations of submergence tolerance at tillering stage and effects of different submergence stress on some agronomic characters in rice were studied.Results showed that :(1) Relative survival of leaf and submergence tolerant ability of stem and tiller can be used as parameter in evaluation of submergence tolerance.The tested varieties can be divided into three types: submergence tolerant,submergence moderate and submergence sensitive.(2) By increasing of submergence stress,the plant height changed generally from short to high and then to short,the days of heading date delay increased and showed submergence sensitive>submergence moderate > submergence tolerant in three types,and the effects of submergence stress on yield were submergence sensitive>submergence moderate > submergence tolerant in three types.