Effects of different calcium salts on freezing resistance of satsuma mandarin.

Chinese Journal of Applied Ecology

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Effects of different calcium salts on freezing resistance of satsuma mandarin.

LI Xin-guo^1,2;ZENG Bin¹;YANG Xiao-hong¹;HE Li-gang¹;WANG Hui-liang¹;SUN Zhong-hai^1,3

¹National Center for Citrus Breeding, Huazhong Agricultural Universit
y, Wuhan 430070, China；²College of Horticulture and Landscape Architect
ure, Hainan University, Danzhou 571737, Hainan, China;³Institute of Fruit
and Tea, Hubei Academy of Agricultural Sciences, Wuhan 430209, China

Received:2007-12-16 Revised:1900-01-01 Online:2008-08-20 Published:2008-08-20

Abstract

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 CaCl₂ 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.

Key words: Thalia dealbata residue, crystal violet, adsorption isothermal, kinetics, thermodynamics.

LI Xin-guo^1,2;ZENG Bin¹;YANG Xiao-hong¹;HE Li-gang¹;WANG Hui-liang¹;SUN Zhong-hai^1,3. Effects of different calcium salts on freezing resistance of satsuma mandarin. [J]. Chinese Journal of Applied Ecology.

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Effects of different calcium salts on freezing resistance of satsuma mandarin.

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