Influences of plant growth-promoting rhizobacteria CH1 on phenolic metabolism in cucumber and its relation to resistance to cucumber damping-off

Abstract

Abstract: In order to explore the mechanism of the resistance to cucumber damping-off induced by plant growth-promoting rhizobacteria CH1, the physiological and biochemical method was employed to study the changes in activities of Phenylalanine ammonia-lyase(PAL), Polyphenol oxidase(PPO) and contents of ferulic acid, chlorogenic acid, lignin, phenolic compound and flavonoid of phenolic metabolism in cucumber roots pretreated with plant growth-promoting rhizobacteria CH1 and infected by Pythium aphanidermatum. The results showed that the activities of PAL and PPO, the contents of ferulic acid, chlorogenic acid, lignin, phenolic compound and flavonoid in roots treated by CH1 increased higher than those of the nontreated when plants were infected by Pythium aphanidermatum. This indicated that CH1 could induce resistance of cucumber to Pythium aphanidermatum by increasing its enzymes activities of phenolic metabolism.

CLC Number:

S476

Liang Jiangen,, Zhang Bingxin, Yu Jingquan. Influences of plant growth-promoting rhizobacteria CH1 on phenolic metabolism in cucumber and its relation to resistance to cucumber damping-off[J]. Chinese Agricultural Science Bulletin, 2007, 23(6): 462-462.

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