黄淮地区冬小麦的抗晚霜冻害能力

Spring frost resistance of winter wheat in Huang-Huai area

使用人工移动霜箱,对黄淮麦区小麦霜冻害的抗冻性进行了研究。结果表明,按幼穗的冰点来判定不同品种的抗霜能力,可以将小麦的抗霜冻能力分为4个等级:-4℃以上抗性弱,-4～-5℃抗性较弱,-5～-6℃抗性较强,-6℃以下抗性强。随着生育进程的推进,小麦的冰点升高;随着茎高的增高,冰点升高,主茎和分蘖的受害率增大;随着细胞液浓度的升高,冰点降低,受害率降低。小麦在雌雄蕊末到药隔初的冰点温度较高。随着生育时期的推进,幼穗的冻死率升高,而其冻伤率降低。

The spring frost resistance of winter wheat in Huang-Huai area after jointing stage was determined by con- trolled experiment with artificial frost Chamber.The results showed that the freezing point temperature of the young ear(the critical leaf temperature for frost injury after the young ear frozen)could be a criterion of frost resistance of wheat.The frost resistance of wheat were divided into four levels:above -4℃,-4 to -5℃,-5 to -6℃and below -6℃for low,middle low,middle high,and high resistance of whea...