关键词: 菜薹, 葡聚六糖, 立枯病, 病程相关蛋白, 内源激素

Abstract: The influences of glucohexaose on sheath blight（Rhizoctonia solani）occurrence，pathogenesis-related proteins（PRs）and endogenous hormones contents were studied in flowering Chinese cabbage（Brassica campestris L. ssp. chinensis var. utilis Tsen et Lee）using the inoculation of R. solani at different glucohexaose levels. The results showed that glucohexaose could increase the resistance of plants to R. solani，and reduce the incidence of sheath blight，but had no effect on the yield. After inoculation with R. solani，the yield of flowering Chinese cabbage was reduced significantly compared with control. Glucohexaose treatments could alleviate the inhibition of R. solani on plant growth，and reduce the loss of the yield caused with R. solani. Both exogenous glucohexaose and inoculation with R. solani increased the activities of chitinase and β-1,3-glucanase，ethylene production, and the contents of indole acetic acid（IAA）and abscisic acid（ABA）. These data suggested the involvement of endogenous hormones in the regulation of pathogenesis process of R. solani. It is important for inducing systematic acquired resistance of flowering Chinese cabbage to sheath blight to keep high level of PRs and endogenous hormones.

Key words: flowering Chinese cabbage, glucohexaose, sheath blight, pathogenesis-related protein, endogenous hormone