实验室冷冻法鉴定2个冬小麦品种抗寒性研究

The cold resistance of two winter wheat cultivars appraised by the freezing method in a experiment room

摘要: 以实验室冷冻法研究模拟东北、内蒙古自治区赤峰等地区麦田土壤温度日变化规律，测定“Norstar”、“米罗诺夫808”2个冬小麦品种的生理生态抗寒性，1月份(隆冬季节)2个冬小麦品种的死亡率为50％时临界温度值(LT50)分别为-27．712 和-26．3℃ ，死亡率为20％时临界温度值(LT20)分别为-26．2℃ 和-23．9℃ 。返青期2个冬小麦品种的死亡率为50％时临界温度值分别为-12．9℃ 和-11．7"12，死亡率为20％时临界温度值分别为-10．0℃ 和-8．9℃ 。

Abstract: Imitating the regularity of temperature variation in the winter wheat field of Chifeng City，in Inner-mongolia and the northeast regions by using the freezing method．two hardier cuhivars “Norstar’’and “Mironovskaia 808’’are selected tO determine their 1etha1 temperatures．The LT20 of “Norstar” and “Mironovskaja 808”is -26．2℃ and -23．9℃ ．the LT50 is-27．712 and -26．3℃ respectively in January；the freezing tolerance of the varieties in February is 1ass-hardened。their LT20 is -10．0℃ and -8．912 and the LT50 is -12．912 and -11．7℃ respectively．