title: Effects of di-n-butyl phthalate and di (2-ethylhexyl) phthalate on the growth, photosynthesis, and chlorophyll fluorescence of wheat seedlings.
abstract: Phthalates are commonly used man-made chemicals that can be released into soil, water, and the atmosphere. The potential toxicity of phthalates on wheat seedlings has not been well studied. To better understand the deleterious effects of di-n-butyl phthalate (DBP) and di (2-ethylhexyl) phthalate (DEHP) on wheat seedlings, their influences on the following were investigated: plant growth, net photosynthetic rate (Pn), stomatal conductance (Gs), transpiration rate (Tr), intercellular CO2 concentration (Ci), chlorophyll content, initial fluorescence (F0), maximal photochemical efficiency (Fv/Fm), photochemical quenching (qP), non-photochemical quenching (qN), effective quantum yield of photosystem II (ΦPSII), and photosynthetic electron transport rate (ETR). Compared with the control, the growth indices (plant height, fresh and dry weights of shoots, fresh and dry weights of roots), Pn, Gs, Tr, Ci, chlorophyll content, Fv/Fm, qP, ΦPSII, and ETR decreased in the 5 μg mL(-1) and 10 μg mL(-1) DBP and DEHP treatments, whereas F0 and qN increased. When wheat seedlings were treated with 20 μg mL(-1) of DBP and DEHP, the growth indices, Pn, Gs, Tr, chlorophyll content, Fv/Fm, qP, qN, ΦPSII, and ETR decreased significantly, whereas Ci and F0 increased. A decrease in the Pn of wheat seedlings was mainly caused by stomatal limitation in the 5 μg mL(-1) and 10 μg mL(-1) DBP and DEHP treatments. However, stomatal and non-stomatal limitations may have caused the reduction in Pn in the 20 μg mL(-1) DBP and DEHP treatments. Notably, the noxious effect of DBP on the wheat seedlings was significantly greater than that of DEHP.
authors.affiliation: Department of Environmental and Chemical Engineering, Tianjin Polytechnic University, No. 399 Binshui Western Road, Xiqing District, Tianjin, 300387, China; State Key Laboratory of Separation Membranes and Membrane Processes, Tianjin Polytechnic University, No. 399 Binshui Western Road, Xiqing District, Tianjin, 300387, China. Electronic address: kyforever2013@163.com.
authors.forename: Minling
authors.initials: M
authors.lastname: Gao
authors.affiliation: Department of Environmental and Chemical Engineering, Tianjin Polytechnic University, No. 399 Binshui Western Road, Xiqing District, Tianjin, 300387, China. Electronic address: 1227433792@qq.com.
authors.forename: Yun
authors.initials: Y
authors.lastname: Qi
authors.affiliation: Department of Environmental and Chemical Engineering, Tianjin Polytechnic University, No. 399 Binshui Western Road, Xiqing District, Tianjin, 300387, China. Electronic address: songwhteam_new@sina.com.
authors.forename: Wenhua
authors.initials: W
authors.lastname: Song
authors.affiliation: Department of Environmental and Chemical Engineering, Tianjin Polytechnic University, No. 399 Binshui Western Road, Xiqing District, Tianjin, 300387, China. Electronic address: 785626186@qq.com.
authors.forename: Haoran
authors.initials: H
authors.lastname: Xu
mesh_terms: D002734:Chlorophyll / Q000378:metabolism; D003993:Dibutyl Phthalate / Q000633:toxicity*; D004051:Diethylhexyl Phthalate / Q000633:toxicity*; D004579:Electron Transport; D004785:Environmental Pollutants / Q000633:toxicity*; D005453:Fluorescence; D010788:Photosynthesis / Q000187:drug effects; D045332:Photosystem II Protein Complex / Q000378:metabolism; D018517:Plant Roots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D018520:Plant Shoots / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D036226:Seedlings / Q000187:drug effects / Q000254:growth & development / Q000378:metabolism; D014908:Triticum / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism
chemical_list: D004785:Environmental Pollutants; D045332:Photosystem II Protein Complex; D002734:Chlorophyll; D003993:Dibutyl Phthalate; D004051:Diethylhexyl Phthalate
keywords: Chlorophyll fluorescence; Photosynthesis; Phthalate acid esters; Wheat seedlings