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ÃÞ »¨ ѧ ±¨ Cotton Science 2008£¬20(6)£º477-479
Studies on Identification Way and Mechanism of Chilling Resistance at Bud Bursting Period in Cotton Abstract£ºThe chilling resistance identification of cotton at bud bursting period was studied with chilling-resistant variety Lumianyan 16 and chilling-susceptible variety Zhong 404A , treated with 4 ¡æ low temperature. The results showed that percentage of cotyledon unfolding of bud recovering 7 days after 5 days, 4 ¡æ chilling treatment could be as a chilling resistance identification index at the cotton bud bursting period. We have also investigated the chilling resistance of 14 different lines at bud bursting period. The results showed that the chilling resistance of different lines at bud bursting period had significant difference. Two cotton lines with strong resistance level and nine cotton lines with middle resistance level to chilling have been screened. The chilling resistance mechanisms of cotton bud have two ways: with the occurring ability of adventitious root rising after chilling treatment, the chilling resistance of cotton at bud bursting period is stronger; and the gravitropism of cotton radicula is also a key factor concerning the chilling resistance of cotton at bud bursting period.
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