大葱感染霜霉病后生理特性的研究

Studies on Physiological Characteristics of Welsh Onion Infected by Downy Mildew

在对大葱霜霉病进行田间鉴定的基础上,对感病材料和抗病材料的生理特性进行了分析。结果显示,发病后抗病材料和感病材料的叶绿素含量、类胡萝卜素含量都呈下降趋势,但感病材料下降的幅度大。大葱材料感染病菌后,抗病材料可溶性糖含量上升的幅度小于感病材料;抗病材料蛋白质含量下降,感病材料上升;感病材料游离氨基酸和丙二醛含量增幅大于抗病材料;抗病材料脯氨酸含量增幅明显高于感病材料。发病前,抗病材料过氧化物酶活性和超氧化物歧化酶活性高于感病材料,发病后,抗病材料酶活性增幅大于感病材料。

Based on the field Investigation of Downy Mildew of welsh onion, physiological analysis was done to both resistant and susceptible varieties. The results showed that the chlorophyll content and carotenoid content dropped on both varieties. But the susceptible cultivar dropped more than the resistant one when the varieties were infected by Downy Mildew. The soluble sugar content of both euhivars increased after infection, but the susceptible eultivar increased more than the resistant one. The soluble protein content in susceptible cultivar increased a little, and the resistant one dropped after infection. The free amino acid content and MDA of the susceptible cultivar increased more than the resistant one. The proline content in the resistant cuhivar increased more than the latter after infection. In normal condition, the POD activity and SOD activity in the resistant cuhivar were higher than those in the susceptible one. After infection, the resistant cultivar increased more than the latter.