title: Physiological differences in response to di-n-butyl phthalate (DBP) exposure between low- and high-DBP accumulating cultivars of Chinese flowering cabbage (Brassica parachinensis L.).
abstract: To increase understanding on the mechanisms of cultivar difference in contaminant accumulation in crops, this study was designed to compare the physiological responses to di-n-butyl phthalate (DBP) exposure between low (Lvbao70) and high (Huaguan) DBP cultivars of Chinese flowering cabbage (Brassica parachinensis L.). Under high DBP exposure, significant differences in various physiological responses were observed between the two cultivars, which might account for the variation in DBP accumulation. Ultrastructure observation also showed different alterations or damages in the mesophyll cell structures between both cultivars, especially for the chloroplast disintegration, starch grain quantity, and plastoglobuli accumulation. Compared with Huaguan, Lvbao70 suffered greater decreases in biomass, chlorophyll content, carbon assimilation, gas exchange parameters, photosynthetic electron transport capacity, and antioxidase activities, which would have resulted in a great reduction of photosynthetic capacity. Although Lvbao70 enhanced energy dissipation and activities of some antioxidant enzymes, they did not provide sufficient protection against oxidative damage caused by DBP. The result suggested that the lower DBP tolerance of Lvbao70 might be associated with its poor physiological performances, which was responsible for its lower DBP accumulation to protect itself from toxicity. Additionally, Lvbao70 had a significantly lower transpiration rate and stomatal conductance than Huaguan, which might be the factors regulating DBP-accumulation variation.
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China.
authors.forename: Hai-Ming
authors.initials: HM
authors.lastname: Zhao
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China.
authors.forename: Huan
authors.initials: H
authors.lastname: Du
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China.
authors.forename: Lei
authors.initials: L
authors.lastname: Xiang
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China.
authors.forename: Yan-Wen
authors.initials: YW
authors.lastname: Li
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China. Electronic address: yingqy@126.com.
authors.forename: Quan-Ying
authors.initials: QY
authors.lastname: Cai
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China. Electronic address: tchmo@jnu.edu.cn.
authors.forename: Ce-Hui
authors.initials: CH
authors.lastname: Mo
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Cao
authors.affiliation: Guangdong Provincial Research Center for Environment Pollution Control and Remediation Materials, Guangzhou Key Laboratory of Environmental Exposure and Healthy, School of Environment, Jinan University, Guangzhou 510632, China; Consortium on Health, Environment, Education and Research (CHEER), and Department of Science and Environmental Studies, Hong Kong Institute of Education, Hong Kong, China.
authors.forename: Ming-Hung
authors.initials: MH
authors.lastname: Wong
mesh_terms: D001937:Brassica / Q000187:drug effects / Q000502:physiology*; D002734:Chlorophyll / Q000378:metabolism; D003993:Dibutyl Phthalate / Q000378:metabolism / Q000633:toxicity*; D010084:Oxidation-Reduction; D010788:Photosynthesis / Q000187:drug effects; D012989:Soil Pollutants / Q000378:metabolism / Q000633:toxicity*
chemical_list: D012989:Soil Pollutants; D002734:Chlorophyll; D003993:Dibutyl Phthalate
keywords: Cell ultrastructure; Chinese flowering cabbage (Brassica parachinensis L.); Di-n-butyl phthalate; Genotypic variation; Physiological response