中文摘要：

以5个籼稻品种为材料，通过抽穗期高温处理和离体花粉萌发等试验，研究了开花期高温对水稻花粉萌发和结实的影响．结果表明，不同品种水稻对高温处理的敏感度明显不同，其中品种黄华占在高温处理4d后的花粉萌发率达到70％以上，在高温处理7d后小穗结实率仍保持50％左右，其他4个品种的花粉萌发率和小穗结实率都明显低于黄华占，由此认为，黄华占是一个耐热性较强的品种．

英文摘要：

Effect of high temperature on pollen germination and seed setting of five rice cultivars during heading period was investigated. The results showed that the pollen germination rate of Huanghuazhan under high temperature for 4 d was above 70% ,and its seed setting rate under high temperature 7 d was about 50% ,while the other cultivars had lower pollen germination rates and seed setting rates. Therefore, Huanghuazhan is a heat-tolerant cultivar.