【摘要】 为了探明枯萎病菌侵染对裸仁美洲南瓜不同抗感品种根系生长的影响，试验采用根系扫描和分光光度法，测定枯萎病菌侵染对裸仁美洲南瓜不同抗感品种根系生长、根系活力和木质素含量等指标的影响。结果表明：与对照相比，枯萎病菌侵染后，裸仁美洲南瓜不同抗感品种根系生长指标和根系活力整体呈下降趋势，而木质素含量呈增加趋势，但是抗病品种根系总长度、根系表面积、根系体积、根系活力和木质素含量均显著高于感病品种。接菌第5天，抗病品种处理组根系木质素含量是感病品种的1.35倍；接菌7 d和9 d时，抗病品种处理组根尖数和分枝数分别是感病品种的1.28倍和1.24倍。接菌第9天时抗感品种根系活力达到峰值，抗病品种是感病品种的1.14倍。更多还原

【Abstract】 To investigate the effect of F.oxysporum infection on root growth of hull-less Cucurbita pepo,root scanning and spectrophotometric methods were used to assess changes in root growth parameters, root activity and lignin content in different resistant varieties of hull-less Cucurbita pepo.The results showed that the root growth index and root activity of hull-less Cucurbita pepo decreased compared to the control, whereas the lignin content increased after F.oxysporum infection. However, the total root length, root surface area, root volume, root activity and lignin content in resistant varieties were significantly higher than in susceptible varieties.On the 5th day of inoculation, the lignin content in the root system of the resistant variety treatment group was 1.35 times that of the susceptible variety.At 7 and 9 days after inoculation, the number of root tips and branches in the treatment group of resistant varieties was 1.28 times and 1.24 times that of susceptible variety after inoculation, respectively.The root activity of the resistant and susceptible varieties peaked on the 9th days after inoculation, with the root activity of resistant variety being 1.14 times that of susceptible variety.The results provide an important theoretical basis for further studies on the effects of F.oxysporum infection on the root growth of different resistant varieties of hull-less Cucurbito pepo.更多还原