Growth,14CO2 fixation,activites of photosystems,ribulose 1,5-bisphosphate carboxylase and nitrate reductase in trees as affected by simulated acid rain |
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| Authors: | K Muthuchelian C Murugan R Harigovindan N Nedunchezhian G Kulandaivelu |
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| Affiliation: | 1. School of Energy, Environment and Natural Resources, Madurai Kamaraj University, 625 021, Madurai, India
2. School of Biological Sciences, Madurai Kamaraj University, 625 021, Madurai, India
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| Abstract: | In seedlings of the tropical tree speciesErythrina variegata Lam. andHardwickia binata Roxb. exposed to different acidic mist (H2SO4, pH 5, 3 and 2) for 5 d significant reduction in seedling growth, biomass accumulation and14CO2 fixation were determined. In isolated chloroplasts a decrease in the activities of photosystem 2 and whole electron transport
chain was observed only at pH 3 and 2, but no significant change in photosystem 1 activity was observed. SDS-PAGE analysis
of crude leaf extracts of ribulose 1,5-bisphosphate carboxylase (RuBPC) indicated a significant loss of 55 and 15 kDa polypeptides
at pH 2 inErythrina. The reduction in the RuBPC activity in seedlings grown under acidic mists correlated well with CO2 fixation. |
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| Keywords: | Erythrina variegata Hardwickia binata H2SO4 polypeptides photosynthesis |
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