【摘要】 以"龙丰"、"龙冠"、"海棠优系1"、"海棠优系2"、"富士"5种苹果的1a生休眠枝条为试材,采取人工模拟外界环境的方法进行不同梯度的低温处理,测定5种苹果枝条的电解质外渗率,并配合Logistic方程对各品种枝条的低温半致死温度(LT50)进行了拟合。结果表明:随处理温度的不断降低,5种苹果枝条的电解质外渗率变化趋势呈现明显的"S"型曲线;在-36.4～-44.7℃时,各品种枝条的半致死温度(LT50)先后出现,抗寒力强弱顺序为:"龙丰"(M.pumila‘Longfeng’)>"海棠优系1"(M·spectabilis‘Ⅰ’)>"龙冠"(M.pumila‘Longguan’)>"海棠优系2"(M·spectabilis‘Ⅱ’)>"富士"(‘Fuji’Apple)。更多还原

【Abstract】 Taking M.pumila ’Longfeng’,M.pumila ’Longguan’,M·spectabilis’Ⅰ’,M·spectabilis’Ⅱ’,’Fuji’ apple five different varieties 1-year-old dormant branches of apple as test materials,annual dormant branches from the changes of leakage ratio of electrolyte and the influence of the semi-lethal temperature(LT50) were investigated.The changes of leakage ratio of electrolyte of the branches which were treated under different artificial simulated low temperature were studied.The semi-lethal temperature(LT50) was obtained on the basis of conductivity and Logistic equation.The results showed that leakage ratio of electrolyte increased like ’S’ curve concomitant with temperature reducing.The semi-lethal temperature for apple was from-36.4℃ to-44.7℃.The sequence of the cold resistance was M.pumila ’Longfeng’ >M·spectabilis’Ⅰ’>M.pumila ’Longguan’>M·spectabilis’Ⅱ’>’Fuji’ Apple.更多还原