辽宁稻区水稻新品系抗寒性鉴定OACSTPCD

Cold damage is considered one of the important factors affecting rice production.In order to pro-mote the rapid transformation of scientific research achievements into practical productivity,improve the com-prehensive productivity of rice,increase the research on stress resistance of new varieties,especially cold re-sistance,screen cold resistance resources,and provide scientific basis for accelerating the promotion and ra-tional layout of high-quality varieties.This experiment used cold water irrigation method to identify the cold re-sistance of 81 japonica rice lines from Liaoning rice region.The results showed that after cold water treatment,The agronomic and yield traits of each strain are showing a downward trend.Among them,the plant height de-creased by 1.3～39 cm;Reduce ear length by 0.3～10.6 cm;Reduce the total number of grains per spike by 2～89 grains;The decrease in fruiting rate is 34.5%～96.6%;Normal and sturdy varieties reduce thousand grain weight by 0.9～16.9 g;Thedecrease in yield per mu is 47%～100%.Overall,BeijingG1,YJ 16,Bei-jingG 12,Liaoyou 86,BeijingG 6,Liaojing Xiang 3,Tiejing 2114,and KH12 have good cold resistance,with a yield reduction of 47%～55.7%,which belongs to the first level and provides important utilization value for cold tolerance breeding of japonica rice.