AM真菌和镰刀菌对西瓜根系膜脂过氧化作用和膜透性的影响

 在温室盆栽条件下研究了丛枝菌根(arbuscular mycorrhiza,AM)真菌Glomus versiforme (Karsten) Berch和西瓜枯萎镰刀菌(Fusarium oxysporum f. sp. niveum)对西瓜根系中膜脂过氧化产物丙二醛(MDA)含量和细胞膜透性的影响。结果表明,接种AM真菌的西瓜根系中MDA含量、组织自动氧化速率和膜透性均低于对照,先接种G. versiforme,后接种F. oxysporum f. sp. niveum处理的MDA含量、组织自动氧化速率和细胞膜透性均低于只接种F. oxysporum f. sp. niveum的处理。接种G. versiforme感枯萎病西瓜品种"郑杂5号"MDA含量、组织自动氧化速率和膜透性降低幅度大于抗病品种"京欣1号"的接种处理,说明G. versiforme可降低感病西瓜品种的膜透性和MDA的产生,从而有效地保护细胞膜系统,减轻F. oxysporum f. sp. niveum对西瓜的为害程度。

Influences of arbuscular mycorrhizal fungi and Fusarium oxysporum f. sp. niveum on lipid peroxidation and membrane permeability in watermelon roots

Influence of arbuscular mycorrhizal(AM) fungus, Glomus versiforme ,and Fusarium oxysporum f.sp. niveum on malondiadehyde(MDA) content, autoxidation rate and membrane permeability in roots of watermelon was investigated under pot cultural conditions in greenhouse. Results showed that inoculation with G.versiforme in roots of watermelon resulted in a lower level of MDA content, autoxidation rate and membrane permeability compared with the non mycorrhizal control. MDA content, autoxidation rate and membrane permeability in roots pre inoculated with G.versiforme and post inoculated with F.oxysporum f.sp. niveum were lower compared with those in roots treated solely with F.oxysporum f.sp. niveum . The decrease extent of the MDA content, autoxidation rate and membrane permeability was greater in susceptible cultivar "Zhengza No.5" than in resistant cultivar "Jingxin No.1". Our results suggested that inoculation with G.versiforme could protect the membrane permeability and reduce the damage caused by F.oxysporum f.sp. niveum in watermelon plants.