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Sulphur dioxide is well recognized phototoxic air pollutant and can
also be utilized as a potential source of sulphur for plants
growing in sulphur deficient soils. It is unique among the gases
for acting as nutrient and as well as a toxic agent. Thus
assessments of plant responses to sulphur dioxide must consider
positive as well as negative impacts.sulphur dioxide will achieve a
maximum growth rate at a concentrations which are close to the
metabolic requirements of the plant, however toxicity will occur at
concentrations above the metabolic requirements. This study
assessed the plant responses to sodium metabisulphite (0, 20, 40,
60, 80, and 100 in ugm/l) In Brassica Campestris cv. Pusa gold by
evaluating physiological and biochemical parameters. The study also
suggests the suitability of some of the parameters for employing
them as reliable bioindicators of sulphur stress."
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