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cje ›› 2010, Vol. 29 ›› Issue (02): 319-323.

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XU Chun-li1|XIAO Jia-xin1,2;QI Xiao-xiao1|ZHANG Shao-ling2|SHEN Yan1|YANG Hui1   

  1. 1Provincial Key Laboratory of Biotic Environment and Ecological Safety in Anhui, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, China|2College of Horticulture, Nanjing Agricultural University, Nanjing 210095, China
  • Online:2010-02-10 Published:2010-02-10

Abstract: A sand culture experiment was conducted to study the effects of different concentration Zn on the leaf physiological indices and Zn contents of citrus “Shiranuhi” (Citrus reticulata × (C. reticulata ×C. sinenesis)) and “Ponkan” (Citrus reticulate). Three treatments were installed, i.e., 0 mg Zn·L-1(Zn deficiency), 0.05 mg Zn·L-1 (control), and 0.5 mg Zn·L-1 (Zn excess). Under Zn deficiency, the leaf chloroplast pigments content and leaf area of “Shiranuhi” were significantly lower; while under Zn excess, these two parameters of “Ponkan” decreased significantly. No significant differences in the leaf POD activity of “Shiranuhi” and leaf CAT activity of “Ponkan” were observed among the three treatments. The leaf CAT and SOD activities of “Shiranuhi” increased with increasing medium Zn concentration. Under Zn deficiency, the leaf POD, CAT and SOD activities of “Ponkan” were significantly higher than than those of “Shiranuhi”; while under Zn excess, the leaf SOD activity of “Ponkan” was significantly lower than that of “Shiranuhi”. The leaf MDA contents of “Shiranuhi” and “Ponkan” under Zn excess were significantly higher those under the control; and the leaf MDA content of “Ponkan” was significantly higher than that of “Shiranuhi”. For both “Shiranuhi” and “Ponkan”, their leaves at different positions were increased with increasing Zn concentration. In the same treatments, “Ponkan” leaves had significantly higher Zn content than the other parts of “Ponkan” and the leaves of “Shiranuhi”, and the Zn contents of “Shiranuhi” upper leaves were significantly higher than those of “Shiranuhi” basal leaves.

Key words: Alpine meadow, Zoker-mound, Successional stage, Diversity, Functional group