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102个杂交种以及它们的23个亲本材料在种子萌发后10天种在温度为12℃的水槽中,同时种一个敏感和一个抗寒的品种作为对照。10天后,运用水稻的标准鉴定法,根据叶片颜色的变化来分等级。然后将稻苗移入温室,移入后第5天和第10天根据恢复状况又将其分为0～1级(0表示完全冻死,0.5表示受到严重危害,1表示稍有危害或无危害).每个供试品种设三次重复,共取12株,其级别总和再换算为抗寒对照品种(Fujibaka5)的平均级别的百
102 hybrids and their 23 parental materials were planted in sinks at a temperature of 12 ° C 10 days after germination and a sensitive and a cold-tolerant variety was used as a control. Ten days later, using the standard rice identification method, according to the changes in leaf color to grade. The rice seedlings were then transferred to the greenhouse and again classified into grades 0 to 1 on the 5th and 10th day after transplantation (0 means complete freeze-thaw, 0.5 means severely endangered and 1 means slightly endangered or non-endangered) Each test variety set three times to repeat, a total of 12 strains, the total level and then converted into the cold control varieties (Fujibaka5) average level of 100