EFFECT OF ELEVATED CO2 ON THE PHOTOSYNTHESIS, GROWTH AND WATER RELATION OF BRASSICA SPECIES UNDER MOISTURE STRESS

An attempt has been made to study the interactive effect of elevated C O2 and moisture stress on photosynthesis, growth and water relations o f Brassica species using open top chambers. It was observed that plant s responded to elevated CO2 significantly under moisture stress condit ion mitigating the adverse effects on photosynthesis and growth of Bra ssica species. Relatively drought susceptible species, viz. B. campest ris and B. nigra, responded to elevated CO2 markedly as compared to le ss sensitive B. carinata and B. juncea plants. The water status of pla nts significantly improved under elevated CO2 concentration possibly b y increasing stomatal resistance and/or by increased root growth.