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Research Article Open access CC BY 4.0

Physiological Responses of Wheat Associate with Heat Tolerance

Minakshi R. Neware, N. R. Potdukhe

International Journal of Environment and Climate Change · pp. 1–10 · Published 19 May 2023

10.9734/ijecc/2023/v13i81926

Abstract

This study was performed to explore heat stress tolerance indices to judge terminal heat tolerance genotypes from nine wheat genotypes viz: AKAW 5023, AKAW 4927, PBN 4905, PBN 4751-02, NIAW 3523, NIAW 2891, AKAW 4210-6 (C), NIAW 34 (C), NIAW 1994 (C) at Wheat Research Unit, Dr. Panjabrao Deshmukh Krishi Vidyapeeth, Akola (MH) during Rabi 2016-17 and 2017-2018. The trial was setup in RBD design with three replications. Yield and Physiological traits were recorded and correlated with yield. Genotype NIAW 2891 noted significantly high germination %,CTD (4.30oC), minimum membrane thermo-stability index (48.86%) at 75 DAS (grain filling stage), exhibited more RGR (0.0074 g g-1 day-1), NAR (0.0500 g dm2 day-1), early 50% flowering (58.16 days), days to maturity (91.83 days) and more grain yield ha-1 (35.65 q/ha) followed by genotype NIAW 3523 (33.83 q/ha)  during both the year and noted as heat tolerance genotypes against the best check AKAW 4210-6. Correlation analysis showed that yield under stress environment had positive significant correlate with days to 50 % flowering and physiological maturity however, canopy temperature and membrane thermo-stability index had negative significant correlation with yield. Hence, due emphasis should be given to these attributes for genetic improvement in wheat under heat stress condition.

Wheat heat stress condition CTD MTSI RGR NAR 50% flowering maturity

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