Effect of Arbuscular Mycorrhiza on the Drought Tolerance of Poncirus trifoliata Seedlings |
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Authors: | Qiangsheng Wu Renxue Xia Zhengjia Hu |
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Institution: | (1) Key Laboratory of Horticultural Plant Biology, Ministry of Education, College of Horticulture and Forestry, Huazhong Agricultural University, Wuhan, 430070, China;(2) College of Life Science and Technology, Huazhong Agricultural University, Wuhan, 430070, China |
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Abstract: | The effects of Glomus mosseae colonization on the plant growth and drought tolerance of 1-year-old trifoliate Poncirus trifoliata seedlings in potted culture were studied in natural water stress and rewatering conditions. Results showed that arbuscular
mycorrhizal (AM) inoculation significantly improved the height, stem diameter, and fresh weight of P. trifoliata seedlings before natural water stress. By the end of the experiment, the survival percentage of AM-transplanted seedlings
was 8% higher than those of non-AM ones. During water stress and rewatering, AM significantly increased the contents of soluble
sugars and proteins in leaves, and enhanced the activities of superoxide dismutase (SOD), guaiacol peroxidase (G-POD), and
catalase (CAT) in either seedling leaves or roots, which indicated that AM colonization could improve the osmotic adjustment
response of P. trifoliata, enhance its defense system, and alleviate oxidative damages to membrane lipids and proteins. These results demonstrated
that the drought tolerance of P. trifoliata seedlings was increased by inoculation with AM fungi. The functional mechanism underlying the observation that mycorrhizas
increased the host’s drought tolerance was closely related to enzymatic and nonenzymatic antioxidant defense systems such
as SOD, G-POD, CAT, and soluble protein.
Translated from Chinese Journal of Applied Ecology, 2005, 16(3) (in Chinese) |
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Keywords: | arbuscular mycorrhiza drought tolerance functional mechanism Poncirus trifoliata defense system |
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