Abstract: The size of anther, number of pollen and diameter of fertile pollen were analysed with 14 cultivars of Oryza sativa L. under cool temperature treatment. The relationship were discovered between the size of anthers and the number of pollen (r= 0. 831** ) as well as between cold tolerance (seed-setting rate) and the size of anthers (r= 0. 853** ) or the number of fertile pollen (r= 0. 915** ). There is a positive relationship between coldtolerance (seed-setting rate) and the diameter of fertile pollen (r= 0. 75** ). The number of fertile pollen was considered as the most important factor of cold tolerance at booting stage.

Key words: booting stage, cold tolerance, factor, fertile pollen

摘要： 在冷温处理条件下,通过对14个不同耐冷性水稻品种的花药大小、花粉大小和花粉数的测量分析,明确了花药长度与花药内的总花粉数密切相关(r=0.831**),花药长度和花药内的可育花粉数与耐冷性的关系密切(r=0.853**,r=0.915**),发现花粉大小与耐冷性之间有显著的正相关关系(r=0.75**),可育花粉数是水稻孕穗期耐冷性的主要构成因子。

关键词: 孕穗期, 耐冷性, 构成因子, 可育花粉