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Acid rain (AR) is a serious environmental issue inducing harmful impacts on plant growth and development. It has been reported that  Liquidambar formosana , considered as an AR-sensitive tree species, was largely injured by AR, compared with  Schima superba , an AR-tolerant tree species. To clarify the different responses of these two species to AR, a comparative proteomic analysis was conducted in this study. More than 1000 protein spots were reproducibly detected on two-dimensional electrophoresis gels. Among them, 74 protein spots from  L. formosana  gels and 34 protein spots from  S. superba  gels showed significant changes in their abundances under AR stress. In both  L. formosana  and  S. superba , the majority proteins with more than 2 fold changes were involved in photosynthesis and energy production, followed by material metabolism, stress and defense, transcription, post-translational and modification, and signal transduction. In contrast with  L. formosana , no hormone response-related protein was found in  S. superba . Moreover, the changes of proteins involved in photosynthesis, starch synthesis, and translation were distinctly different between  L. formosana  and  S. superba . Protein expression analysis of three proteins (ribulose-1,5-bisphosphate carboxylase/oxygenase large subunit, ascorbate peroxidase and glutathione-S-transferase) by Western blot was well correlated with the results of proteomics. In conclusion, our study provides new insights into AR stress responses in woody plants and clarifies the differences in strategies to cope with AR between  L. formosana  and  S. superba .

Proteomic Analysis Reveals Differences in Tolerance to Acid Rain in Two Broad-Leaf Tree Species, Liquidambar formosana and Schima superba