Abstract: The aim of our study was to investigate the influences of chitooligosaccharide on sheath blight occurrence,pathogenesis-related proteins(PRs) and endogenous hormones contents.Youqingsijiu flowering Chinese cabbage(Brassica campestris L.ssp. chinensis var .utilis Tsen et Lee) was chosen as the material.At the early stage of stalk formation,0.4,2 and 8 mg/L chitooligosaccharide and sterile water(control) were sprayed,and 2 days later,plants were inoculated by Rhizoctonia solani.The results showed that 0.4 mg/L chitooligosaccharide could increase the resistance of plants to R.solani,reduce the incidence of sheath blight,and thus reduce the loss of the yield caused with R.solani.Compared with inoculation alone,foliar application of 0.4 mg/L chitooligosaccharide could further enhanced the activities of chitinase and-1,3 glucanase within 6 days of inoculation,and the production of ethylene,indole acetic acid and abscisic acid after 6 days of inoculation.These data suggested that it is important for inducing systematic acquired resistance of flowering Chinese cabbage to sheath blight to induce high level of PRs in a shorter time after inoculation,and later keep high contents of endogenous hormones.

Key words: Flowering Chinese cabbage, Chitooligosaccharide, Sheath blight, Pathogenesis-related proteins, Endogenous hormones

CLC Number: 

• S662.5

• Q945.78

• X53