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在控温条件下对６９０份中日双方提供的稻种资源进行了芽期和苗期的耐冷性评价。结果为：①筛选出芽期极强（０级）耐冷资源２５份，强（１～２级）耐冷资源８９份；筛选出苗期极强和强耐冷资源分别为１４份和８份。其中，２９份资源的芽期和苗期的耐冷性均较强。②强级以上耐冷资源在类型上以日本平原粳稻和云南粳稻为主。③云南稻种芽期和苗期的耐冷资源在生态地理分布上相对集中，新平、墨江、普洱、澜沧等县可能是其主要集散地
The cold tolerance of buds and seedlings of 690 rice germplasm resources provided by China and Japan was evaluated under the condition of temperature control. The results were as follows: ①Twenty-five cold-tolerant resources and 89 cold-tolerant resources were screened at the budding stage (0 level), and 14 and 8 cold-resistant resources were screened at seedling stage. Among them, the 29 germplasm resources and seedling stage of cold tolerance are strong. ② strong resistance to cold above resources in the type of Japanese plain japonica rice and Yunnan-based. (3) Cold-tolerant resources in bud and seedling stage of Yunnan rice are relatively concentrated in ecophysiological distribution, and Xinping, Mojiang, Pu’er and Lancang counties may be their main distribution centers