Scientia Agricultura Sinica ›› 2012, Vol. 45 ›› Issue (10): 1964-1971.doi: 10.3864/j.issn.0578-1752.2012.10.009

• HORTICULTURE • Previous Articles     Next Articles

Protective Effects of Exogenous Chitosan on Oxidative Damage in Pepper Seedling Leaves Under Water Stress

 MA  Yan-Xia, YU  Ji-Hua, ZHANG  Guo-Bin, CAO  Gang   

  1. 甘肃农业大学农学院，兰州 730070
  • Received:2011-06-29 Online:2012-05-15 Published:2012-03-27

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Abstract: 【Objective】The aim of the experiment was to study the protective effects of exogenous chitosan on protective enzymes, antioxidant substances, osmotic adjustment material and membrane lipid peroxidation of pepper seedlings under water stress.【Method】The protective effects of exogenous chitosan at different concentrations(10, 30, 50, 80 mg•L-1) on oxidative damage in leaves of pepper seedlings under water stress were investigated with peppers varieties ‘Longjiao No.3’, ‘Longjiao No.2’ and ‘Zhongyan No.8’ as materials.【Result】Under water stress, the activities of superoxide dismutase and peroxidase, proline content, malondialdehyde content and relative conductivity of pepper seedlings were significantly higher than that of control (P<0.05), and the contents of glutathione and ascorbic acid were significantly lower than other treatments. The activities of superoxide dismutase and peroxidase, the relative conductivity, malondialdehyde and proline content apparently decreased, but the soluble proten contents and the contents of glutathione and ascorbic acid increased in treatments of different concentrations of chitosan compared with control.【Conclusion】Chitosan at 50 and 80 mg•L-1 increased the content of antioxidant substances, effectively prevented the accumulation of malondialdehyde and proline, mitigated the lipid peroxidation caused by water stress, and enhanced the plant's drought resistance.

Key words: chitosan, pepper, water stress, antioxidant enzymes, antioxidant substances, osmotic adjustment substance

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