title: [Dynamics of soil phenols in continuous cropping solar greenhouse and their effects on disease resistance-related enzyme activities in cucumber root].
abstract: The study showed that under solar greenhouse condition, the contents of soil p-hydroxybenzoic acid, ferulic acid and benzoic acid and their total amounts increased with increasing continuous cropping years, and were obviously higher after continuously cropped for 5, 7 and 9 years than for 1 and 3 years. Different concentration of soil phenols resulted in completely different effects on disease resistance-related enzyme activities in cucumber root, e. g., under lower concentrations (40 and 80 microg x g(-1)), the activities of phenylalanine (PAL), ployphenol oxidase (PPO) and peroxidase (POD) were increased, while under higher levels (120 and 160 microg x g(-1)), they were restrained. Therefore, the changes of soil phenol contents in continuous cropping solar greenhouse could be one of the essential factors affecting the disease-resistance of cucumber.
authors.affiliation: College of Horticulture, Shandong Agricultural University, Taian, China. yuanyi@sdau.edu.cn
authors.forename: Yunhua
authors.initials: Y
authors.lastname: Ma
authors.forename: Min
authors.initials: M
authors.lastname: Wei
authors.forename: Xiufeng
authors.initials: X
authors.lastname: Wang
mesh_terms: D004156:Catechol Oxidase / Q000378:metabolism; D018553:Cucumis sativus / Q000201:enzymology*; D009195:Peroxidase / Q000378:metabolism; D010636:Phenols / Q000378:metabolism*; D010649:Phenylalanine / Q000378:metabolism; D010935:Plant Diseases; D018517:Plant Roots / Q000201:enzymology*; D012987:Soil / Q000032:analysis*; D013472:Sunlight
chemical_list: D010636:Phenols; D012987:Soil; D010649:Phenylalanine; D004156:Catechol Oxidase; D009195:Peroxidase