【摘要】 利用西瓜植株残体 (根、茎、叶 )的水浸提液进行西瓜种子发芽和幼苗生长试验。结果表明 :西瓜残体水浸提液对西瓜种子萌发和幼苗体内相关酶活性有一定的抑制作用。当浸提液浓度大于 1 0 g/L时 ,对种子萌发有明显的抑制作用 ,并随着浓度升高 ,抑制作用增强。水培过程中 ,浸提液浓度大于 2 0 g/L时 ,幼苗根部酶活性受抑显著。不同部位相比 ,西瓜叶的抑制作用最为明显 ,茎、根次之。进而说明西瓜根、茎、叶残体的淋洗物及其分解产物 (化感物质 )对西瓜根系生长有一定的毒害作用 ,其物质积累过多成为西瓜产生连作障碍的原因之一。更多还原

【Abstract】 The autointoxication of watermelon are studied through the seed germination and growth experiment,with the water extracts of root, stem and leaf. The results showed that the extraction of root, stem and leaf of watermelon have some inhibiting effects on seed germination and enzyme activities of seedlings. The s began to restrain seed germination(enzyme activities of seedlings) at 10(20) g/L. The inhibition effect was stronger and stronger with density increasing. And the effect of leaf was the strongest. It indicates that the self-poisoning effects of watermelon might be one of the reasons for poor natural regeneration and soil degradation of watermelon mono-culture.更多还原