The future CO 2 concentration is projected to reach 900-1000 ppm levels by the end of twenty-first century, pertaining to global climatic changes. Consequences of climate change such as changes in mean climatic conditions, increasing extreme weather events, relentless increase in atmospheric CO 2 concentration and increasing pest damage pose serious threats to agricultural productivity. An experiment was planned to assess the response of yam bean to elevated CO 2 , as it is of paramount importance to identify photosynthetically efficient climatesmart crops and varieties to meet future food demand. The net photosynthetic rate (P n ), stomatal conductance (g s ) and intercellular CO 2 (C i ) of yam bean variety, Rajendra Misrikand-1 was recorded under elevated carbon dioxide (400-1000 ppm) and photon flux density (PPFD; 50-2000 lmol m -2 h -1 ) at 30 ± 2 °C, 70-80% relative humidity and 0.8-1.2 kPa vapour pressure deficit. The mean P n rate steadily increased at 200-1000 ppm owing to enhanced intercellular CO 2 . The same trend was observed in the case of intercellular CO 2 . However, contrasting results were recorded with regard to g s , which steadily decreased at ascending carbon dioxide concentrations. Further, P n had a significant (P \ 0.001) linear correlation with the PPFD (R 2 = 0.973). Yam bean was found to be responsive to elevated carbon dioxide as P n rate at 1000 ppm increased up to 23% relative to 400 ppm.
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