不同类型稻抗旱性鉴定指标研究

Studies on the Index of Drought- Resistance in Some Rice Varieties

以具有代表性的粳稻、旱稻、陆稻、籼稻及其杂交种共18个品种(组合)为试材,采用淹水栽培与旱作对比的方法,分析了不同类型稻的抗旱性及其鉴定方法 ,探讨了这些方法及指标与水分胁迫条件下水稻产量的关系。选出两个与水分胁迫条件下产量关系最为密切的水稻生理指标 ,确定了水稻旱作时结实率为最直观的抗旱性鉴定指标。

Eighteen varieties (or combinations) of typical Japonica-type and hybrid rice were grown in paddy and rainfed cultivations, physiological and economical drought resistance and the relationship between drought-resistance indices and the yield were discussed. In this report, two physiological indices at different growth stages were closely related to ther yield under water stress. Percentage of seed setting in dryland was the most direct index of drought-resistance of rice. K-value grading as a basis for rice resistance to drought was also evaluated.