摘要： 为探讨牛蒡寡糖（Bo）诱导西瓜苗对枯萎病产生抗性的合适浓度，采用盆栽试验研究了不同浓度Bo对西瓜苗生长、枯萎病发病情况和生理指标的影响。结果表明：喷施5～50 mg/L的Bo可降低西瓜枯萎病的发病率，相对防效可达到22.48%；西瓜单株鲜质量、株高、过氧化氢酶（CAT）、过氧化物酶（POD）、超氧化物歧化酶（SOD）活性分别增加4.83%～53.10%，0.14%～22.81%，9.89%～32.62%，24.69%～59.77%，6.19%～12.61%；Bo浓度在5～30 mg/L时，丙二醛（MDA）、氧自由基（O₂^·）产生速率分别降低2.63%～23.53%，7.11%～18.53%；浓度为50 mg/L时，MDA、O₂^·产生速率分别增加3.79%，5.10%。综合本试验中西瓜苗生长、发病情况，SOD、POD、MDA和O₂^·产生速率的变化幅度，牛蒡寡糖在西瓜苗上的合适应用浓度是20～30 mg/L。

关键词: 牛蒡寡糖, 诱导抗性, 西瓜, 枯萎病

Abstract: Pot experiment was used to study the effects of Burdock oligosaccharide on the growth,disease index and physiological index in watermelons. In order to ascertain the appropriate concentration of Burdock oligosaccharide inducing the resistance to Fusarium wilts in watermelon. The results suggested that after treated with Burdock oligosaccharide of concentration from 5 to 50 mg/L,the watermelon disease index decreased by the efficacy 22.48%. The fresh weight of per seeding,seeding height,CAT activity,POD activity and SOD activity increased by 4.83%-53.10%,0.14%-22.81%,9.89%-32.62%,24.69%-59.77%,6.19%-12.61% respectively. MDA content and O₂^· generation rate decreased by 2.63%-23.53% and 7.11%-18.53% after treated with Burdock oligosaccharide at the concentration range from 5 to 30 mg/L. But MDA content and O₂^· generation rate increased by 3.79% and 5.10% when the concentration of Burdock oligosaccharide was 50 mg/L. Comprehend all the data above,the appropriate concentration of Burdock oligosaccharide applied to watermelon was 20-30 mg/L.

Key words: Burdock oligosaccharide, Induced resistance, Watermelon, Fusarium wilts

中图分类号: 

• S432.2