Author(s):

BS Ganigara, Shakuntala NM, Basave Gowda, Vijaykumar Kurnalliker, Srinivas AG, PH Kuchanur and Ananda N

Abstract: In scenario of global climate changes, air temperature may increase between 1.4 - 5.8 oC and atmospheric carbon dioxide (CO2) concentration is predicted to rise from today’s value of current 370–550 ppm by 2050 and could reach between 730 and 1010 ppm by 2100. These changes may increase the frequency of extremes, including drought conditions, which will have significant consequences for crop growth and seed production in the future. An investigation was carried out to study the response of elevated carbon dioxide and temperature regimes on seed production of heat tolerant maize RCRMH-2 under Open Top Chamber (OTC’s) at Centre for Agro-climatic studies, University of Agricultural Sciences, Raichur, Karnataka during summer season 2019 and 2020. Morphological parameters and pysiological parameter indicated that, maize can be positively affected by CO2 enrichment and temperature regime, in part, because of improved water relations. The exposure of the crop elevated CO2 and temperature regime resulted in all the treatments the temperature was more than the threshold temperature (35 °C mean) during the reproductive stage. This might lead to pollen abortion. Also the silk might have dried at in this temperature and relative humidity leads to non seed setting in all the treatments. The results indicated that in summer season (Jan-May) maize exposed to elevated temperature affects the flowering stage during the months of March and April results in wilting, leaf firing and tassel blast leads to non availability of pollen grains for seed set.

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