寒地水稻耐冷基础的研究Ⅰ.种子吸水、发芽与温度的量化关系

Studies on The Resistance of Rice to Low Temperature in Cold Region Ⅰ. The Quantitative Relationship of Seed Water Absorption and Germination to Temperature

利用生长曲线模型，确立了８个水稻品种在不同温度条件下吸水及发芽的临界下限温度与５０％种子发芽所需有效积温。结果表明：哈３５０１３的临界下限温度及５０％种子发芽所需有效积温均低，耐芽期低温能力较强。

Based on the results of water absorption and germination of 8 rice cultivars (lines) under different temperature regimes, we determined their threshold low temperature and effective accumulated temperature required for 50% seeds germination by using growth curve model. The results showed that the threshold low temperature and effective accumulated temperature for 50% seeds germination of H35013 were low, indicating that its low temperature tolerance is stronger at germinating stage. The effects of temperature on water absorption by rice seeds were also elucidated.