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Growth and physiological responses of selected pakchoi varieties to Plasmodiophora brassicae infection

文献类型： 外文期刊

作者： Zhu, Hongfang 1 ; Li, Xiaofeng 1 ; Khalid, Muhammad 2 ; Xi, Dandan 1 ; Zhang, Zhaohui 1 ; Zhu, Yuying 1 ;

作者机构： 1.Shanghai Acad Agr Sci, Hort Res Inst, Shanghai Key Lab Protected Hort Technol, Shanghai, Peoples R China

2.Shanghai Jiao Tong Univ, Sch Agr & Biol, Key Lab Urban Agr, Shanghai 200240, Peoples R China

关键词： Clubroot disease; Disease index; Root growth; Antioxidant enzyme activities; Respiratory enzyme activities

期刊名称：JOURNAL OF PLANT PATHOLOGY （ 影响因子：1.729； 五年影响因子：1.681 ）

ISSN： 1125-4653

年卷期：

页码：

收录情况： SCI

摘要： Clubroot disease, caused by Plasmodiophora brassicae, is a serious soil-borne disease of Brassica crops worldwide. Pakchoi is one of the most important cruciferous vegetable crops and commonly infected by P. brassicae. To date, the physiological changes and mechanism of pakchoi in response to P. brassicae are largely unknown. In this study, seedlings of two pakchoi cultivars, cv. Xinxiaqing (a clubroot-susceptible cultivar) and Yanlong (a less susceptible cultivar than Xinxiaqing), were inoculated with P. brassicae. Results showed that infected roots were enlarged and changed into club shape galls. Fresh root weight, relative electrical conductivity, the activity of lactate dehydrogenase (LDH) and alcohol dehydrogenase (ADH) in infected roots were significantly induced. In contrast, a significant reduction of root length, root function, and the activity of succinic dehydrogenase (SDH), catalase (CAT), ascorbate peroxidase (APX), and superoxide dismutase (SOD) were observed in diseased roots. Interestingly, activities of malate dehydrogenase (MDH) and peroxidase (POD) in S1 and S2 plant roots were increased and decreased in S3 plant roots. Additionally, infected Xinxiaqing roots showed more serious disease symptoms than Yanlong, and the antioxidant enzyme activities were lowered in Xinxiaqing roots compared with those in infected Yanlong roots, indicating the importance of these enzymes in plant resistance against clubroot disease.

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