Abstract
Two japonica and four indica type varieties of rice, were used to study the response of rice seedlings of various ages for tolerance against chilling temperature. Fourteen batches of seedlings raised at 2 days intervals were treated at 3℃ for 2 days in an incubator. The results obtained were summarized as follows: 1. The younger the seedling age, the more tolerant to chilling injury, and severe injury was observed in the older seedlings. 2. The rice seedlings of 3-leaf ages were found to be most suitable to distinguish the varietal difference in cold resistance, because the difference in survival rate between tolerant and susceptible varieties was the largest at this stage. 3. In general, japonica varieties showed higher survival rate, indicating that they tolerate more to the low temperature than that of indica varieties. Hsinchu glutinous 4 was found to tolerate more than Taichung 65 within Japonica varieties, while, Hsinchu-Ai-Chueh-Chien toleranted the most to the low temperature within the Indica varieties tested.
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