AM真菌对青枯菌的抑制和对酚类物质的影响

INHIBITION OF RALSTONIA SOLANACEARUM BY AM FUNGUS GLOMUS VERSIFORME AND THEIR EFFECT ON PHENOLS IN ROOT

以青枯菌Ralstoniasolanacearum为供试病原菌 ,研究接种AM真菌Glomusversiforme后根系酚类物质含量的变化及其对病原菌数量的影响。结果表明 ,在接种R solonacearum前4周接种G versiforme可以抑制病原菌 ,降低根际、根面和木质部中病原菌的数量 ,降幅分别达到 2 6 7%、 79 3%和 81 7%。G versiforme降低R solonacearum数量与根系酚类物质含量的变化有关 ,单独接种G versiforme或R solonacearum可以提高可溶性酚和壁结合态酚的含量 ,但是前者的可溶性酚增加幅度大于后者 ,而壁结合态酚增加幅度小于后者。

With Ralstonia solanacearum as pathogen, the change of phenols in root and their effect on the pathogen population after inoculation of an arbuscular mycorrhizal (AM) fungus, Glomus versiforme Berch., was investigated.Results indicated that G.versiforme inoculation, 4 weeks before pathogen inoculation, significantly decreased the pathogen population in the rhizosphere, on the root surface and in the xylem, by 26.7%, 79.3% and 81.7%, respectively.It was suggested that the inhibition of R.solonacearum was contributed to the increased phenols in root.Inoculation of both G.versiforme and R.solonacearum promoted the soluble phenols and the cell wall-bound phenols contents.Compared with the pathogen inoculation, AM fungal inoculation increased the soluble phenols content at a higher magnitude, while increased the cell wall-bound phenols content at a lower magnitude.