[Relationships between rice empty grain rate and low temperature at booting stage in Heilongjiang Province].
Six major rice varieties (Longdao 3, Kendao 12, Kongyu 131, Longdao 7, Longjing 16, and Songjing 6) in Heilongjiang Province were treated with low temperature 15 degrees C, 17 degrees C, and 19 degrees C for 2, 4, 6 and 8 days at booting stage, and the relationships between their empty grain rate per panicle and low temperature at booting stage were analyzed by using linear interpolation and linear regression methods. In the province, the critical temperature of sterile-type cool injury was 17 degrees C for sensitive varieties, and 16 degrees C for resistant varieties. The most sensitive period of rice to low temperature was 14-18 days before heading. At 15 degrees C for 8 days, the empty grain rate of Songjing 6 and Kendao 12 increased significantly, while that of Kongyu 131 increased less, suggesting that the cold tolerance of Songjing 6 and Kendao 12 was relatively weak, while Kongyu 131 was insensitive to low temperature. There was a significant correlation between the accumulated cool temperature and the empty grain rate of Kendao 12, Longjing 16, and Kongyu 131 (P<0.01). With the increase of accumulated cool temperature, the rice empty grain rate increased significantly, but the increment varied with rice variety.
Jiang
Li-xia
LX
Heilongjiang Province Institute of Meteorological Science, Harbin 150030, China. jianglixia0326@yahoo.com.cn
Ji
Sheng-tai
ST
Li
Shuai
S
Wang
Lian-min
LM
Han
Jun-jie
JJ
Wang
Liang-liang
LL
Zhu
Hai-xia
HX
Ji
Yang-hui
YH
D002681:China; D003080:Cold Temperature; D017753:Ecosystem; D016014:Linear Models; D012275:Oryza / Q000145:classification / Q000254:growth & development*; D012639:Seeds / Q000254:growth & development*