Effects of simulated acid rain on chloroplast activity in Dimorcarpus longana Lour cv wulongling leaves

Abstract

Abstract: Adecreased content of chlorophyll (Chl) and carotenoid (Car) was found in the Dimorcarpus longana Lour. cv. wulongling leaves when treated with <pH3.5 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 pHvalue 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.

Key words: Simulated acid rain, Dimorcarpus longana Lour cv wulongling, Chloroplast activity, Photosynthesis, Karst, soil hydrolase activity, land form, goestatistics, spatial heterogeneity, land use type

CLC Number:

QIU Dongliang, LIU Xinghui . Effects of simulated acid rain on chloroplast activity in Dimorcarpus longana Lour cv wulongling leaves[J]. Chinese Journal of Applied Ecology, 2002, (12): 1559-1562.

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