Metabolic responses of tropical trees to ozone pollution.
Plants fumigated with 40ppbv, 80ppbv and 120ppbv concentrations of O3 exhibited significant reduction in total chlorophyll content, RuBP carboxylase activity and net photosynthesis. The reduction in total chlorophyll activity ranged from 12 to 36% in Bauhinia variegata, 11 to 35% in Ficus infectoria and 3 to 26% in Pongamia pinnata on fumigation with O3, while the RuBP carboxylase activity was reduced by 10 to 32% in Bauhinia variegata, 10 to 23% in Ficus infectoria and 9 to 15% in Pongamia pinnata. The net photosynthesis was also reduced by 6 to 26% in B. variegata, 16 to 39% in F. infectoria and 7 to 31% in P. pinnata on fumigation with 03. The relative higher sensitivity of tropical trees to O3 suggests that the ambient air quality standards in tropical tree areas need to be stringent to prevent vegetation from air pollution.
Chapla
J
J
Department of Botany, University College for Women, Osmania University, Koti, Hyderabad-500 095, India.
Kamalakar
J A
JA
D000393:Air Pollutants / Q000633:toxicity; D036481:Bauhinia / Q000187:drug effects / Q000378:metabolism; D002734:Chlorophyll / Q000032:analysis / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004787:Environmental Pollution; D030681:Ficus / Q000187:drug effects / Q000378:metabolism; D033641:Millettia / Q000187:drug effects / Q000378:metabolism; D010126:Ozone / Q000633:toxicity*; D010788:Photosynthesis / Q000187:drug effects* / Q000502:physiology; D018526:Plant Transpiration / Q000187:drug effects* / Q000502:physiology; D012273:Ribulose-Bisphosphate Carboxylase / Q000378:metabolism*; D014197:Trees / Q000187:drug effects* / Q000254:growth & development / Q000378:metabolism
D000393:Air Pollutants; D002734:Chlorophyll; D010126:Ozone; D012273:Ribulose-Bisphosphate Carboxylase