研究了耐热与热敏感品种的籽粒灌浆特性及其对高温的反应。结果表明，在正常条件下，耐热品种与热敏感品种相比具有较高的籽粒平均灌浆速率和最高灌浆速率以及较短的灌浆持续期；在灌浆期受到高温影响的条件下，耐热品种具有能维持其籽粒灌浆进程和灌浆期趋于变长的持续增长耐热机制，而热敏感品种表现灌浆期趋于变短和灌浆高峰提早出现等“高温逼熟”现象；耐热品种受高温影响后还能有效地利用其植株营养体中贮积的有机物质。最后对耐热性与高产育种的关系进行了讨论 The grain filling characteristics of heat-tolerant and heat-sensitive cultivars and their responses to high temperature were studied. The results showed that under normal conditions, the heat tolerant cultivars had higher average grain filling rate, higher grain filling rate and shorter grain filling duration than the heat sensitive ones. Under the condition of high temperature, the heat tolerant varieties Which could maintain its grain filling process and the grain filling stage tended to become longer. The heat-sensitive varieties tended to shorten the grain-filling period and peaked earlier, such as “high-temperature ripening” phenomenon. The heat- After the impact can also effectively use their plant nutrients in the storage of organic matter. Finally, the relationship between heat tolerance and high-yielding breeding was discussed