不同早稻品种(系)乳熟初期高温胁迫下产量及其构成因素的差异性分析

选用11个早稻常规品系和2个杂交组合为试验材料,于乳熟初期放入人工气候箱中进行高温处理,以同期自然温度为对照,对比分析了各材料处理与对照的产量及其构成因素,结果表明:不同水稻品种(系)对高温的响应存在显著的基因型差异,高温处理下8个材料单株产量显著低于对照,2个高于对照,10个材料结实率低于对照,11个材料籽粒充实度和千粒质量低于对照,7个材料的收获指数处理高于对照;与常规品系相比,杂交组合受高温的影响更大;常规品系中531和B670表现出强耐热性;对常规品种乳熟初期高温胁迫更钝感的原因进行了探讨。

Difference Analyses of Grain Yield and Its Components of Different Early Rice Varieties(Strains) under High Temperature Stress at the Early Milk Stage

The comparative analyses of grain yield and its components of 11 early rice conventional strains and 2 hybrid combinations in the plant growth cabinet with a temperature treatment at the early milk stage were made.The natural temperature was taken as the control.The results showed that there were significant genotypic differences in high temperature responses among the thirteen varieties(strains).The single plant yields of 8 materials were significantly lower than that of the control while those of 2 materials were higher than that of CK;the seed setting rates of 10 varieties(strains) were lower than that of the CK;the 1 000-grain weight and plumpness of 11 materials were lower than those of the CK;the harvest indexes of 7 materials were higherthan those of the CK;Compared with inbred rice varieties,the hybrid combinations were more easily affected by high temperature;Zhong531 and B670 showed a strong heat resistance;the reasons why inbred rice varieties were less sensitive to high temperature stress at the early milk stage were discussed.