不溶性胞壁结合酚类物质在棉花对枯萎病抗性中的作用

分析了枯萎病菌侵染后棉花叶片和根茎部组织中不溶性胞壁结合酚类物质 (胞壁结合的简单酚、复杂酚聚合物及黄酮醇 )含量的变化。结果表明 ,抗病品种棉苗中不溶性胞壁结合酚类物质含量高于感病品种 ,同一品种内根茎部组织中含量较高 ;氟乐灵播前土壤处理可诱发棉苗产生对枯萎病的诱导抗性 ,同时也促进了棉苗组织中不溶性胞壁结合酚类物质的积累 ;枯萎病菌侵染后棉苗组织中不溶性胞壁结合酚类物质含量明显增加 ,抗病品种棉苗和经氟乐灵处理的棉苗受侵后不溶性胞壁结合酚类物质含量的增加分别大于感病品种棉苗和未经氟乐灵处理棉苗中的增加水平。这些结果说明 ,不溶性胞壁结合酚类物质在棉花对枯萎病的抗性及由氟乐灵诱发的诱导抗性中起作用

The Role of Insoluble Cell Wall-bound Phenolic Compounds in the Resistance of Cotton Seedlings to Fusarium Wilt

Changes in the contents of insoluble cell-wall-bound pheno lic compounds including simple insoluble cell-wall-bound phenolics, complex in soluble cell-wall-bound polymers and cell-wall-bound flavonols,in leaves an d stems/roots of cotton seedlings after infection by Fusarium oxysporum f.sp. vasinfectum were studied. The levels of insoluble cell wall-b ound phenolic compou nds in cotton seedlings of resistant cultivar (cv. CCRI 12) were higher than tha t in susceptible ones, and the levels in stems/roots were higher than that in le aves. Presowing treatment with trifluralin, which had been demonstrated to induc e the resistance of cotton seedlings to fusarium wilt, increased the levels of i nsoluble cell-wall-bound phenolic compounds both in leaves and stems/roots of cotton seedlings. The levels of insoluble cell-wall-bound phenolic compounds i n cotton seedlings were increased markedly after infection by the pathogen. And the increases of insoluble cell-wall-bound phenolic compounds in cotton seedli ngs of resistant cultivar and the trifluralin-treated seedlings of the two test ed cultivars were much more than that in susceptible seedlings and untreated one s, respectively. Therefore,it is likely that the insoluble cell-wall-bound ph enolic compounds may play a role in the resistance and trifluralin-induced resi stance of cotton seedlings to the fusarium wilt.