• Ritu Chaudhary
• ALTAF AHMAD

In the present investigation, effect of elevated CO2 on the growth and photosynthesis of nitrogen-inefficient (cv. Rasi) and nitrogen-efficient (cv. CR Dhan) rice varieties was studied. The rice varieties were grown in the growth chamber under the treatments of elevated CO2 and low-nitrogen (N). Ambient CO2 level and optimum N treatment was maintained as control. Forty-five-day old plants were harvested for the measurement of growth parameters. Photosynthesis and related parameters were measured in the intact 45-day-old plants. Low-N treatment under the condition of ambient CO2 reduced the growth and photosynthesis significantly in both the varieties, when compared to control. However, the level of reduction was higher in cv. Rasi than cv. CR Dhan. Elevated CO2 treatment at optimum N condition increased the growth and photosynthesis of both the varieties significantly, compared to control. However, under the condition of low N, elevated CO2 level reduced the growth and photosynthetic capacity of rice varieties. Between the two varieties, the reduction in the growth was higher in cv. Rasi. It has been suggested that the nitrogen efficient variety of rice can grow well under the conditions of low N supply and elevated CO2 level.

Nitrogen, elevated CO2, rice, growth

"Differential physiological response of nitrogen-efficient and nitrogen-inefficient rice varieties to elevated CO2 level and low nitrogen", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 5, page no.638-642, May 2019, Available :http://www.jetir.org/papers/JETIR1905X78.pdf

"Differential physiological response of nitrogen-efficient and nitrogen-inefficient rice varieties to elevated CO2 level and low nitrogen", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 5, page no. pp638-642, May 2019, Available at : http://www.jetir.org/papers/JETIR1905X78.pdf