Title: Physiological and Biochemical Responses of Two-years-old Sophora davidii Seedling Leaves to Different Water Stresses
Abstract:It is a precondition to understand the relationship between plant's metabolites and antioxidant enzyme activities and the intensity of drought stress for assessing the their adaptation. A greenhouse e...It is a precondition to understand the relationship between plant's metabolites and antioxidant enzyme activities and the intensity of drought stress for assessing the their adaptation. A greenhouse experiment was conducted to study the changes of malondialdehyde (MDA), proline (Pro), soluble protein, photosynthetic pigment contents, and the activity of superoxide dismutase (SOD), ascorbate peroxidase (APX), catalase (CAT) and peroxidase (POD) in the leaves of 2-years-old Sophora davidii seedlings, which grown under different drought intensities (80%, 60%, 40% and 20% FC) for two years. It was found that the MDA and Pro content were increased linearly under drought stress; the parabola curves in protein, Chla, Chlb and carotenoid contents were observed with increasing drought stress and the highest values were obtained under moderate stresses (60% and 40% FC).The activities of four investigated antioxidant enzymes displayed different response patterns to drought stress. Specifi cally, the activity of SOD and APX increased under the moderate drought while decreased under the severe stress. however pattern of the CAT activity was opposite with drought stress. The POD activity was showed the lowest under 60% FC, highest under 20% FC. It was suggested that the content of soluble protein and photosynthetic pigments, and the activities of SOD, APX, CAT and POD were sensitive indicators that could effectively re? ect the response patterns of the physiological and biochemical activities of Sophora davidii seedlings under drought condition, but the content of MDA and proline were not. For the 2-years-old Sophora davidii seedlings, the 60% FC soil water condition was the threshold at which the negative effect of drought on the physiological and biochemical activities of the leaves begain. Fig 3, Ref 26Read More
Publication Year: 2008
Publication Date: 2008-01-01
Language: en
Type: article
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Cited By Count: 1
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