Abstract:

Abstract：Pot experiments materials were carried out to determine the cold hardiness of four varieties cultivated popularly in Henan ，named Bainong Aikang 58 ，Yumai 49－198，Yunong 949 ，yanzhan4110 ，utilizing the artificial chamber , simulation experiment of frost damage was carried out to find how frost resistance of young ears(FRYE) variate with the differentiation phases proceeding. The results indicated that Bainong Aikang58 showed stronger cold tolerance than the others did,and the FRYE tends to decrease during the whole joining stage.Upon developing into anther connective formation phase from stamens and pistils formation phase ,FRYE drops gradually. The variation curve indicates that young ears of winter wheat develop into low temperature sensitive phase from anther connective formation phase. Frost resistance of varieties should be evaluated at anther connective formation phase. This result is of importance both to selecting frost resistant varieties and to frost damage prevention. Frost resistance of young ears of 4 cultivars were tested at earlier stage of anther connective fromation phase and the effects of several factors on FRYE , such as cultivars , varietal types and development stage were analyed.