Explanations for the differential response of certain tropical tree species to SO2under field conditions
โ Scribed by M. V. Rao; P. S. Dubey
- Publisher
- Springer Netherlands
- Year
- 1990
- Tongue
- English
- Weight
- 430 KB
- Volume
- 51
- Category
- Article
- ISSN
- 0049-6979
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โฆ Synopsis
Four different tree species, Zizyphus mauritiana, Syzygium cumini, Azadirachta indica and Mangifera indica were analyzed for stomatal conductances, sulphate, protein, superoxide dismutase and peroxidase activities for one complete year in an ambient environment with SO 2 concentrations ranging between 90 to 10 ug m 3. The low conductances, declined protein content and enhanced sulphate content, superoxide dismutase (SOD) and peroxidase (POD) activities were the general responses exhibited by these species when compared with to the reference site. The pattern of the results indicate that plants under SO2 stress develop an ability to detoxify the phytotoxicity by undergoing certain biochemical changes. Plants which posses high intitial POD activities coupled with greatly enhanced SOD activity (Z. mauritiana) or plants which can enhance both POD and SOD activities (S. eumini) were more tolerant/least affected than that of A. indica and M. indica.