title: Combined effects of lead and acid rain on photosynthesis in soybean seedlings.
abstract: To explore how lead (Pb) and acid rain simultaneously affect plants, the combined effects of Pb and acid rain on the chlorophyll content, chlorophyll fluorescence reaction, Hill reaction rate, and Mg(2+)-ATPase activity in soybean seedlings were investigated. The results indicated that, when soybean seedlings were treated with Pb or acid rain alone, the chlorophyll content, Hill reaction rate, Mg(2+)-ATPase activity, and maximal photochemical efficiency (F(v)/F(m)) were decreased, while the initial fluorescence (F 0) and maximum quantum yield (Y) were increased, compared with those of the control. The combined treatment with Pb and acid rain decreased the chlorophyll content, Hill reaction rate, Mg(2+)-ATPase activity, F(v)/F(m), and Y and increased F 0 in soybean seedlings. Under the combined treatment with Pb and acid rain, the two factors showed additive effects on the chlorophyll content in soybean seedlings and exhibited antagonistic effects on the Hill reaction rate. Under the combined treatment with high-concentration Pb and acid rain, the two factors exhibited synergistic effects on the Mg(2+)-ATPase activity, F 0, F v/F m, as well as Y. In summary, the inhibition of the photosynthetic process is an important physiological basis for the simultaneous actions of Pb and acid rain in soybean seedlings.
authors: State Key Laboratory of Food Science and Technology, School of Environmental and Civil Engineering, Jiangnan University, Wuxi, 214122, China.
authors: Huiqing
authors: H
authors: Hu
authors: Lihong
authors: L
authors: Wang
authors: Chenyu
authors: C
authors: Liao
authors: Caixia
authors: C
authors: Fan
authors: Qing
authors: Q
authors: Zhou
authors: Xiaohua
authors: X
authors: Huang
mesh_terms: D015258:Acid Rain / Q000633:toxicity*; D017301:Ca(2+) Mg(2+)-ATPase / Q000378:metabolism; D002734:Chlorophyll / Q000737:chemistry / Q000378:metabolism; D004357:Drug Synergism; D004579:Electron Transport / Q000187:drug effects; D005453:Fluorescence; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000633:toxicity*; D055668:Photochemical Processes / Q000187:drug effects; D010788:Photosynthesis / Q000187:drug effects*; D036226:Seedlings / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology; D013025:Glycine max / Q000187:drug effects* / Q000378:metabolism / Q000502:physiology
chemical_list: D015258:Acid Rain; D002734:Chlorophyll; D007854:Lead; D017301:Ca(2+) Mg(2+)-ATPase