甜瓜自毒作用的生理生化机制研究

通过甜瓜植株水浸提液和根系分泌物处理甜瓜幼苗，测定部分相关生理生化指标，探讨甜瓜自毒作用的生理生化机制。结果表明，随着植株水浸提液和根系分泌物浓度的升高，根系活力呈明显下降趋势；自由水含量下降，束缚水含量上升；叶绿素a、叶绿素b和类胡萝卜素含量下降；活性氧上升；脯氨酸含量先降后升；可溶性糖和可溶性蛋白含量先升后降；抗坏血酸含量随根系分泌物处理浓度增加而持续下降，水浸提液处理时无明显变化；水浸提液处理后谷胱甘肽整体呈下升趋势，根系分泌物处理呈上升趋势，但无明显规律性。

Physiological and Biochemical Mechanisms of Melon Autotoxicity

In this paper, physiological and biochemical mechanisms of melon autotoxicity induced by plant aqueous extracts and root exudates were analyzed. The results showed that root activity showed a downward trend with the concentration of melon extracts and root exudates rising; the free water content declined, the bound water content raised; chlorophyll a, chlorophyll b and carotenoid content decreased; activated oxygen increased; proline content decreased firstly and then increased; soluble sugar and soluble protein content increased firstly and then decreased; ascorbic acid content had no obvious changing in extracts conditions, and decreased gradually in root exudates conditions; glutathione content decreased in extracts conditions, and increased in root exudates conditions.