[Effects of simulated acid rain on chloroplast activity in Dimorcarpus longana Lour. cv. wulongling leaves].
A decreased content of chlorophyll (Chl) and carotenoid (Car) was found in the Dimorcarpus longana Lour. cv. wulongling leaves when treated with < pH 3.5 acid rain. The decline of Chl content was caused by the reduction of Chla, while Chlb was less sensitive to the acid rain, which resulted in a decrease of Chla/Chlb ratio. The content of Car and the ratio of Chla to Chlb reduced with the duration of stress time. The injury of acid rain to photosynthetic pigments was intensified by illumination. The activities of photoreduction, photophosphorylation and H(+)-ATPase activity decreased with the reduction of pH value under the simulated acid rain. Therefore, the injury of electron transport chain and the uncoupling of photophosphorylation might lead to the ineffective absorption, transportation and transformation of light energy. In our study, the process of photophosphorylation was more sensitive to acid rain than that of photoreduction.
Qiu
Dongliang
D
College of Horticulture, Fujian Agriculture and Forestry University, Fuzhou 350002. qiudl2001@263.net
Liu
Xinghui
X
D015258:Acid Rain / Q000633:toxicity*; D002736:Chloroplasts / Q000187:drug effects* / Q000378:metabolism; D010788:Photosynthesis / Q000187:drug effects; D018515:Plant Leaves / Q000187:drug effects; D010944:Plants
D015258:Acid Rain