不同水稻品种花期耐旱性评价

摘要

以我国96个主导水稻品种为材料,于水稻开花期进行水分处理l0d,研究水分胁迫下不同水稻品种与水稻产量构成因子的关系.结果表明,开花期水分胁迫对水稻每穗粒数影响不显著,结实率和千粒重有着不同程度的下降.根据水分胁迫指数将供试品种分为耐旱型(WSI＜ 0.0599)、中间型(0.0600＜ WSI＜ 0.2599)和敏感型(WSI＞ 0.2600)3类.筛选出9个耐旱型品种,其中粳型常规水稻1个、籼型常规水稻1个、籼型两系杂交水稻2个、籼型三系杂交水稻5个.籼稻品种的耐旱性明显优于粳稻品种,来源于同一母本冈46A的冈优527、冈优188和冈优725在本试验中都表现出良好的耐旱性.%96 main rice cultivars in China were studied under 10 days water stress at flowering stage in attempt to investigate the relations between different cultivars and yield components.The results showed that water stress made no significant difference in grain number per panicle but decreased seed-setting rate and 1000-grain weight compared to CK group.According to water stress index (WSI) these 96 main cultivars were divided into three groups:drought resistant type (WSI ＜ 0.0599),mid-tolerance type (0.0600 ＜ WSI ＜ 0.2599),and drought sensitive type (WSI ＞ 0.2600).Nine of drought resistant species were screened out,including one conventional japonica species,one conventional indica species,two two-line indica hybrid species,and five three-line indica hybrid species.The drought resistance of indica rice is obviously better than japonica rice.Derived from the same female parent Gang 46A,Gangyou 527,Gangyou 188,and Gangyou 725 showed satisfied capacity to resist drought in this study.