Vol. 10, Issue 10 (2021)

Author(s):
P Maheswari, CN Chandrasekhar, P Jeyakumar, R Saraswathi and L Arul

Abstract:
Atmospheric greenhouse gases (GHGs) concentration has increased in past few decades by the anthropogenic activities which leads to climate change. This changing climate will certainly have impact on agricultural production. An experiment was conducted to investigate the relationship between morpho-physiology and grain yield of rice genotypes under elevated CO₂ condition. Ten short duration rice genotypes viz., N22, ADT 36, ADT 37, ADT 43, ADT 45, CO 51, ASD 16, MDU 6, TPS 5 and Anna (R) 4 were chosen for this study. This experiment was conducted using Open Top Chambers (OTC). Two treatments were given 1. Ambient CO₂ (400 ppm) and 2. elevated CO₂ (550 ppm) during flowering phase. Elevated CO₂ resulted significant changes in morpho-physiological parameters such as plant height, tiller number, leaf area, SPAD chlorophyll index and 1000 grain weight of rice genotypes. N22 followed by Anna (R) 4 and ASD 16 recorded more yield. Elevated CO₂ condition influenced morpho-physiological parameters, which found to be associated with high grain yield under elevated CO₂ condition than plants grown under ambient CO₂ condition.