Effects of coal smoke sulfur di oxide pollution on the accumulation of certain minerals and chlorophyll content of wheat triticum aestivum plants

Pandey, S.N.; Rao, D.N.

Tropical Ecology 19(2): 155-162


ISSN/ISBN: 0564-3295
Accession: 005296343

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The plants were exposed to coal smoke, at an average concentration of 0.8 ppm SO2, in an open-top plastic chamber for 2 h daily for a total period of 60 days between 40 and 100 days of their life-cycle. The soil and plant samples from control and treated plots were periodically analyzed and the changes were characterized, quantified and correlated with the cumulative SO2-dosage received by the plants. Though the fumigated plants did not show any foliar symptoms of injury, they presented changes in them which were detrimental to their metabolic processes. There were distinct reductions of total chlorophyll and chlorophyll a in the fumigated plants. Chlorophyll b was relatively tolerant to SO2-pollution. The accumulation of N and P in SO4-treated plants were lower than those of the control plants. There was a gradual increase of S content in the fumigated plants at increasing dosage of SO2. The soil samples from plots with SO2 fumigated plants had a lower pH, higher organic C and higher S content.