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作 者 ：李新国^1,2;曾斌¹;杨晓红¹;何利刚¹;王会良¹;孙中海^1,3

期 刊 ：应用生态学报 2008年 19卷 08期 页码：1665-1669

关键词：温州蜜柑；

摘 要 ：用20 mmol·L^-1氯化钙（CaCl₂）、醋酸钙（CaAc₂）和硝酸钙（Ca(NO₃)₂）喷施“国庆1号”温州蜜柑叶片，研究3种钙盐对其叶片抗冻性的影响.结果表明：喷施钙盐降低了叶片半致死温度（LT₅₀），提高了温州蜜柑的抗冻性，CaCl₂处理的LT₅₀比对照降低了0.54 ℃，而CaAc₂和Ca(NO₃)₂处理分别比对照降低了1.34 ℃和1.35 ℃，表明CaCl₂处理效果较差，CaAc₂和Ca(NO₃)₂处理效果较好.钙盐处理还提高了“国庆1号”温州蜜柑叶片在低温（-9 ℃）胁迫下的SOD、POD活性及可溶性蛋白质、可溶性糖和脯氨酸含量，减少了叶片MDA的积累.

Abstract:The study on the effects of foliar spraying 20 mmol·L^-1 of CaCl₂, Ca(NO₃)₂ and CaAc₂ on the freezing resistance of satsuma mandarin (Citrus
unshiu Marc. cv. Guoqing No.1) showed that after treated with these Ca salts, the leaves of test plant had a lower half lethal temperature (LT₅₀) than the control (sprayed with distilled water). The LT₅₀ after treated with Ca
Cl₂ was 0.54 ℃ lower, whereas that after treated with CaAc₂ and Ca(NO₃)₂ was 1.34 ℃ and 1.35 ℃ lower, respectively, implying that the latter two
Ca salts were more effective in enhancing the freezing resistance of satsuma mandarin. Moreover, foliar spraying Ca salts increased the superoxidase (SOD) and peroxidase (POD) activities and the contents of soluble proteins, soluble sugars and praline in leaves, and decreased the leaf MDA content.

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