Physiological Responses of Different Kinds of Vegetable Seedlings to Polycyclic Aromatic Hydrocarbons Stress  

作　　者：Xuan TANG Minghua LONG Shuangyu QIAO Pengxin LI Huimin ZHANG Yongsheng LIANG 

机构地区：[1]Agricultural College,Guangxi University,Nanning 530004,China [2]Nanning Vegetable Research Institute,Nanning 530000,China

出　　处：《Agricultural Biotechnology》2019年第5期37-41,46,共6页农业生物技术（英文版）

基　　金：Supported by National Natural Science Foundation of China(31360479);National Modern Agriculture Technology System of Guangxi in Special Vegetable Innovation Team(nycytxgxcxtd-10-03);Natural Science Foundation of Guangxi Province(2014GXNSFAA118100)

摘　　要：This study was conducted to explore the effects of polycyclic aromatic hydrocarbons (PAHs) on the growth and physiological characteristics of vegetable seedlings.Cucumber,Chinese cabbage and radish were cultured under the stress of 16 PAHs at different concentrations of 0.3,0.6 and 0.9 mg/L,respectively,with the seedlings cultured without PAHs as the control,to study the growth and physiological responses of various vegetable seedlings under PAHs stress.The results showed that the leaf width,fresh weight,CAT activity and POD activity of cucumber and the chlorophyll b content and CAT activity of radish reached the minimum values when treated with 0.3 mg/L PAHs.When the treatment concentration was 0.6 mg/L,the POD activity of cucumber,the vitamin C content of Chinese cabbage and the MDA content of radish were the smallest.The dry weight of cucumber,the fresh weight of Chinese cabbage and the fresh weight and POD activity of radish reached the minimums under the treatment of 0.9 mg/L PAHs.Different concentrations of PAHs could promote the synthesis and photosynthesis of chlorophyll in cucumber and Chinese cabbage leaves and the vitamin C content in radish.With the increase of PAHs treatment concentration,the MDA contents of cucumber and Chinese cabbage were on the increase,and reached the maximums under the treatment of 0.9 mg/L PAHs.One of the reasons why different kinds of vegetable seedlings have different physiological responses to PAHs may be related to the differences in the amount of PAHs absorbed by different leaf structures.This study was conducted to explore the effects of polycyclic aromatic hydrocarbons(PAHs) on the growth and physiological characteristics of vegetable seedlings. Cucumber, Chinese cabbage and radish were cultured under the stress of 16 PAHs at different concentrations of 0.3, 0.6 and 0.9 mg/L, respectively, with the seedlings cultured without PAHs as the control, to study the growth and physiological responses of various vegetable seedlings under PAHs stress. The results showed that the leaf width, fresh weight, CAT activity and POD activity of cucumber and the chlorophyll b content and CAT activity of radish reached the minimum values when treated with 0.3 mg/L PAHs. When the treatment concentration was 0.6 mg/L, the POD activity of cucumber, the vitamin C content of Chinese cabbage and the MDA content of radish were the smallest. The dry weight of cucumber, the fresh weight of Chinese cabbage and the fresh weight and POD activity of radish reached the minimums under the treatment of 0.9 mg/L PAHs. Different concentrations of PAHs could promote the synthesis and photosynthesis of chlorophyll in cucumber and Chinese cabbage leaves and the vitamin C content in radish. With the increase of PAHs treatment concentration, the MDA contents of cucumber and Chinese cabbage were on the increase, and reached the maximums under the treatment of 0.9 mg/L PAHs. One of the reasons why different kinds of vegetable seedlings have different physiological responses to PAHs may be related to the differences in the amount of PAHs absorbed by different leaf structures.

关 键 词：POLYCYCLIC AROMATIC hydrocarbon Vegetable SEEDLINGS Growth PHYSIOLOGY and BIOCHEMISTRY 

分 类 号：S[农业科学]