Author(s):

KP Bhokare, RS Wagh and VW Bramhankar

Abstract: Global warming is predicted to increase temperature by 5⁰C by the end of this century. Winter crop to withstand under cooler temperature, it might be changes in cropping system and the global warming demand identification of identification of wheat varieties to high temperature. Wheat is a thermo-sensitive long-day crop requires relatively low temperature for satisfactory growth and high temperature is a major determinant of its growth and productivity. With this objective fourteen wheat genotypes were evaluated for different temperature regimes under controlled condition at Phytotron facility during Rabi, 2014-15 in FCRD with two replications. The experiment was conducted in three steps as germination test, seedling growth test and morpho-physiological analysis for growth and yield variations. Various temperature treatment levels had substantial effects on germination and early vegetative growth and morpho-physiological traits. The 15/15⁰C temperature favours for 100% germination and better germination properties, whereas, 20/20⁰C and 25/15⁰C found good for optimum germination and seedling growth characters in wheat. The 25/20⁰C temperature was found better for earlier crop phenology, better vegetative growth, physiological parameters, biochemical characters and yield and yield contributing characters. The genotypes, LOK-54, LOK-1, DBW-17 and HALNA were superior for maintaining better germination and it’s properties, however, NIAW-2874, NIAW-2892, NIAW-2837 and PBW-343 were good for seedling growth. As per the comparison between lower and elevated temperatures, NIAW-2809, NIAW-2874, NIAW-2859 and NIAW-2837 were found superior at elevated temperature for better vegetative growth, physiological parameters, biochemical characters and yield and yield contributing characters. Therefore, these genotypes might be considered for further breeding programme for crop improvement in wheat at elevated temperature regime for respective characters.

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