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从国际水稻研究所种质库取得50个水稻品种,其中包括粳型品种12个,釉稻18个,爪哇型品种10个,釉×粳杂种3个,以及野生稻7个。在芽期、苗期、移栽期、孕穗期、开花期,进行了耐冷性的测定。结果指出,在不同的水稻类型中,其耐冷性的次序为:粳稻>爪哇型>秈稻>野生稻。从本实验所采用的有限量的品种来看,在苗期粳型品种的耐冷性比其它类型好;在开花期某些爪哇型品种比粳型品种好;在芽期和苗期之间,以及在芽期和开花期之间,其耐冷性有明显的正相关。在其它时期之间未找到这种相关性。这指出,在特殊地区的低温发生时期的一定生育阶段中,进行筛选是必要的。
Fifty rice cultivars were obtained from the International Rice Research Institute, including 12 japonica cultivars, 18 glazed rice, 10 Javanese species, 3 glaze × japonica hybrids and 7 wild rice species. In the bud, seedling, transplanting, booting, flowering, conducted a determination of cold tolerance. The results showed that in different rice types, the order of cold tolerance: japonica> Java> indica> wild rice. From the limited number of cultivars used in this experiment, the cold tolerance of japonica cultivars at seedling stage was better than that of other cultivars. At the flowering stage, some Javanese cultivars were better than japonica cultivars. Between bud stage and seedling stage, And at the bud and flowering stage, its cold tolerance has a significant positive correlation. No such correlation was found between other periods. This points out that screening is necessary during certain stages of fertility during the hypothermia in special areas.