我国稻区辽阔,地理、气候条件复杂,各地区常有不同的冷害发生。早稻烂秧死苗是早春育秧存在的严重问题,是提高水稻产量的一个重要障碍。在防御冷害的各种措施中,选育耐冷品种是有效途径之一。不同品种水稻的耐冷性有很大差异。王洪春等认为,水稻品种苗期耐冷性与原产地有显著相关。据 J.H.Lee 的研究,水稻秧苗 China’s vast rice area, geography, climate conditions are complicated, often in different regions of the chill occurrence. Rotten rice seedling rotten seedlings early spring seedling is a serious problem exists, is to increase rice production is an important obstacle. Among various measures to prevent cold damage, breeding cold-tolerant varieties is an effective way. Cold tolerance of different varieties of rice are very different. Wang Hongchun, etc., that the rice seedling cold tolerance and origin were significantly related. According to J.H. Lee’s research, rice seedlings