Journal of Northeast Forestry University. 2010, (07) Core

Relationship between Active Oxygen Metabolism of Ginkgo Leaf and Cell Membrane Injury under Low-temperature StressChinese Full Text

Yu Wanwen,Cao Fuliang,Wang Guibin(College of Forest Resources and Environment,Nanjing Forestry University,Nanjing 210037,P. R. China)

Abstract: Responses of active oxygen metabolism and membrane permeability in ginkgo leaf to low temperature stress were studied by determining the relative membrane permeability,contents of malondialdehyde （MDA） and hydrogen peroxide （H2O2）,O-2 generation rate,and activities of SOD and POD of the leaves of potted ginkgo seedlings. Results showed that,under low temperatures of 10 degrees C or 5 degrees C,the activities of SOD and POD increased,but O-2 generation rate,contents of H2O2 and MDA,and relative electrical conductance rose slightly,and they tended to be stable in the late period of the stress,indicating that active oxygen metabolism in ginkgo leaf reached a new balance state. Under low temperatures of zero degree C or 2 degrees C below zero,the activities of SOD and POD increased,O-2 generation rate and H2O2 content increased rapidly,meanwhile MDA content and membrane permeability increased remarkably at the initial stage of the stress,while in the late period,the decreasing amplitudes of SOD and POD activities were remarkably higher than those of O-2 generation rate and H2O2 content,and MDA content and membrane permeability further increased,which indicated that SOD and POD could partially eliminate active oxygen under the conditions of short-term low temperature stress,while long-term low temperature led to the unbalance of active oxygen metabolism in ginkgo leaf.

Keywords：

Low temperatures; Ginkgo; Active oxygen metabolism; Cell membrane permeability;

DOI：
10.13759/j.cnki.dlxb.2010.07.026
Series：
Subject：
Classification Code：
S792.95

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Relationship between Active Oxygen Metabolism of Ginkgo Leaf and Cell Membrane Injury under Low-temperature StressChinese Full Text

Yu Wanwen,Cao Fuliang,Wang Guibin(College of Forest Resources and Environment,Nanjing Forestry University,Nanjing 210037,P. R. China)

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