湖南地处中亚热带地区,春季冷空气活动频繁,南下后其前锋易被阻于南岭一带形成静锋,造成长江以南持续降温阴雨天气。早稻育秧时常发生烂种、烂秧,一般年份损失种谷一亿斤左右,严重的年份达3亿多斤,影响季节、良种推广、生产计划和品种布局。因此,鉴定和筛选苗期耐冷性强的水稻品种用于生产和育种具有重要意义。 Hunan is located in the subtropical region with frequent cold air activities in spring. After going south, its forwards are easily blocked by the formation of Jingfeng in the vicinity of Nanling, causing continuous rainy and rainy weather in the south of the Yangtze River. Early rice seedlings often rotten seedlings, rotten seedlings, the general year of loss of about 100000000 kilograms of seed kiln, a serious year of 300000000 kilos, affecting the season, the promotion of varieties, production plans and variety layout. Therefore, it is of great importance to identify and select rice varieties with high cold tolerance at seedling stage for their production and breeding.