Abstract: To study the relevant information of seed germination of three rice varieties planted in Chuxiong area, so as to provide data support for guiding farmers to deal with seeds before sowing, three rice varieties planted in Chuxiong area were treated with water bath at 25 ℃, 37 ℃ and 45 ℃, and their germination rate and amylase activity were measured. The results showed that temperature had a great effect on rice. 45 ℃ treatment could improve the germination rate of rice seeds. At this temperature treatment, the amylase activities of three rice varieties (Yunjing 26, Chujing 28 and Chujing 39) were the highest; Amylase activity was positively correlated with seed germination rate of three rice varieties. Under the same condition, the amylase activity and germination rate of Yunjing 26 were the highest, followed by Chujing 28 and Chujing 39. Three varieties tested showed that the amylase activity was the highest after soaking seeds for 48 hours. It is suggested that rice seeds should be soaked at 45 ℃ for 48 hours before sowing.

Key words: Amylase activity, Rice, Gemination rate