tailieunhanh - Foliar response of Ipomea pes tigridis L. to coal smoke pollution

Compared with the control, chlorophyll a, b and carotenoid contents decreased significantly under pollution stress. Rate of photosynthesis and stomatal conductance dropped drastically, whereas CO2 level in the mesophyll increased at the polluted sites. The maximum adverse effects were observed at site B, situated 2 km from the emission source. | Turk J Bot 30 (2006) 413-417 © TÜB‹TAK Research Note Foliar Response of Ipomea pes-tigridis L. to Coal-Smoke Pollution . VERMA, MAHMOODUZZAFAR, Tariq Omar SIDDIQI*, M. IQBAL Department of Botany, Hamdard University, New Delhi-110062 - INDIA Received: Accepted: Abstract: Air pollutants emitted from Badarpur Thermal Power Plant, New Delhi, influenced the foliar features of a common weed, Ipomea pes-tigridis L., as observed at distances , 2, 6, 12 and 16 km from the emission source. Observations recorded at the pre-flowering, flowering and post-flowering stages of plant growth indicated that the stomatal pore size, number of stomata, and stomatal index on both surfaces of leaves decreased near the source of pollution. Compared with the control, chlorophyll a, b and carotenoid contents decreased significantly under pollution stress. Rate of photosynthesis and stomatal conductance dropped drastically, whereas CO2 level in the mesophyll increased at the polluted sites. The maximum adverse effects were observed at site B, situated 2 km from the emission source. Key Words: Ipomea pes-tigridis, coal-smoke pollution, photosynthesis, stomata Introduction Consumption of fossil fuel, a major source of energy, adds to the ambient environment a complex mixture of pollutants (Gupta & Ghouse, 1987). The main air pollutants generated by coal-based power plants are CO, HF, SO2, NOx, and fly ash (Iqbal et al., 2000b; Pandey, 2005). Leaves, by virtue of their unique function and position on plants, experience maximum exposure to the ambient environment and hence exhibit changes in form, structure and function in response to alterations in the ambient environment. These changes may serve as markers of atmospheric pollution (Saxe, 1996; Ahmad & Ahmad, 2003). In the present study, we investigated the effects of long-term (seed germination – seed-set stage) exposure of leaves of Ipomea pes-tigridis L. to coal-smoke pollutants. The chosen determinants were

• Nông nghiệp
• Ipomea pes tigridis
• Coal smoke pollution
• Seed germination
• Seed set stage
• Dimethyl sulphoxide
• Silene multifida
• Plant extract
• Antimicrobial activity
• Column chromatography
• Rosa heckeliana
• Breast cancer cell lines
• Phenolic constituents
• Thin layer chromatography