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International Journal of Agricultural Research
Year: 2018  |  Volume: 13  |  Issue: 1  |  Page No.: 39 - 52

Evaluation of Tolerance of Six Irrigated Spring Wheat (Triticum aestivum L.) Genotypes to Heat Stress using Stress Tolerance Indices and Correlation Analysis

M.A.H.S. Jahan, Akbar Hossain, Jagadish Timsina and Jaime A. Teixeira da Silva    

Abstract: Background and Objective: Climate models indicate that temperatures across the globe will increase impacting on food security. Therefore, it is important to develop wheat cultivars that are heat-tolerant and are suitable for cultivation under a changing climate. The objectives of this study were to examine the accuracy of different Stress Tolerance Indices (STIs) in a bid to identify wheat genotypes that are suitable to grow under heat-stressed environments and can also be used for future breeding programs developing heat-tolerant genotypes. Materials and Methods: An experiment was conducted over two years with six wheat genotypes (‘BARI Gom 26’, ‘BARI Gom 27’, ‘BARI Gom 28’, ‘BAW 1130’, ‘BAW 1138’, ‘BAW 1140’) under six environmental conditions, namely Early Sowing (ES) (10 November), Optimum Sowing (OS) (20 November), Slightly Late Sowing (SLS) (30 November), Late Sowing (LS) (10 December), Very Late Sowing (VLS) (20 December) and Extremely Late Sowing (ELS) (30 December)) in four Agro-Ecological Zones (AEZs) of Bangladesh. To identify wheat genotypes suitable for a heat-stressed environment, seven STIs were calculated based on wheat Grain Yield (GY), i.e., Stress Susceptibility Index (SSI), Mean Productivity Index (MPI), Tolerance Index (TOL), Geometric Mean Productivity Index (GMPI), Yield Index (YI), Yield Stability Index (YSI) and relative performance (RP%). Results: Based on STIs, two genotypes, ‘BARI Gom 28’ and ‘BARI Gom 26’, were found to be tolerant to ES, LS, SLS, VLS and ELS whereas ‘BARI Gom 27’ was susceptible to all five heat-stress conditions (ES, LS, SLS, VLS and ELS). Similarly, when considering the correlations between GY and STIs, ‘BAW 1140’, ‘BARI Gom 28’ and ‘BARI Gom 26’ performed best while ‘BARI Gom 27’ and ‘BAW 1130’ performed poorest under heat stress in all four locations and for all six sowing dates in both years. Conclusion: Therefore, genotypes ‘BAW 1140’, ‘BARI Gom 28’ and ‘BARI Gom 26’ are recommended for early and late heat-stress conditions experienced when sown during early or late in the season.

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