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。

Abstract: 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.