Influence of Rising Atmospheric CO 2 Concentrations and Temperature on Morpho-Physiological Traits and Yield of Rice Genotypes in Sub Humid Climate of Eastern India

Abstract

A possible scenario for the end of the 21st century is that the atmospheric CO2 concentration will be in the range of 510 - 760 μl∙L-I and that the mean global temperature will be 1.5˚C - 4.5˚C higher than present day. One of the pre-eminent manifestations of climate change is the increase in atmospheric CO2 concentration. Both CO2 and temperature are the key variables of global climate and may cause significant changes in crop productivity. An experiment was conducted inside open top chamber (OTCs) in kharif season 2014 to evaluate the effects of CO2 enrichment and temperature rise with condition OTC1 (ambient condition), OTC2 (25% higher CO2 than ambient), OTC3 (25% higher CO2 + 2˚C ˃ ambient temperature) and OTC4 (2˚C ˃ ambient temperature) on physiological traits and yield of rice genotypes to identify the suitable genotypes for changing climatic conditions. The study revealed that rice genotypes performed better under elevated CO2, with slight changes in development, such as...