Abstract
The influence of zinc deficiency on the levels of carbonic anhydrase and photorespiratory enzymes was investigated in rice ( Oryza sativa L.) and pearl millet ( Pennisetum americanum L.Leeke) grown in sand culture.Carbonic anhydrase was associated with the chloroplasts in rice while it was found to be cytoplasmic in pearl millet and was appreciably lowered in both the plants under zinc deficiency.Zinc deficiency enhanced photorespiration in rice as evidenced by increase in CO 2 compensation concentration and the levels of photorespiratory enzymes.However these parameters were not affected in pearl millet under zinc deficiency.It is believed that the lowered carbonic anhydrase activity resulted in the enhancement of photorespiration in rice.
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