Abstract:

In order to make a reasonable arrangement of rice varieties in Jilin province and reduce the dangerous of low temperature, cold-tolerance research was carried out during booting period on the base of the main rice cultivars. 7 main cultivated rice varieties in Jilin province (‘Changbai9’, ‘Changbai16’, ‘Jijing803’, ‘Jijing105’, ‘Jiling88’, ‘Jijing 8’, ‘Jijing81’) were treated with low temperature 16℃ at booting stage. After low temperature treatment for 6-14 days continuous 9 days, the rice grain empty rate was determined through linear interpolation. And the relationship between the grain empty rate and days in low temperature was analyzed by using regression method. The results indicated that all of the rice varieties in this test showed the highest grain empty rate when in low temperature for 10-13 days after which the change were not significant. ‘Changbai19’ which was the most sensitive variety to low temperature was first reached highest empty grain rate. And according to the result, ‘Jijing81’ was the most insensitive variety to low temperature. The cold tolerance ability of the other 5 varieties was moderate. From this paper, we can conclude that low temperature tolerance ability was different significantly among varieties, and low temperature tolerance selection is one of the effective ways to increase cold resistance of rice.