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Current Research in Agricultural Sciences

June 2021, Volume 8, 1, pp 37-46

Heat Tolerance Stability of Bread Wheat Genotypes under Early and Late Planting Environments through Stress Selection Indices

Zeeshan Ahmad


Muhammad Ishaq


Iqra Tahir


Adeel Khan


Kainat Jehan

Zeeshan Ahmad 1 ,

Muhammad Ishaq 2
Iqra Tahir 1 Adeel Khan 1 Kainat Jehan 5

  1. Department of Plant Breeding and Genetics, The University of Agriculture, Peshawar, Pakistan. 1

  2. Cereal Crops Research Institute (CCRI), Pirsabak, Nowshera, Pakistan. 2

  3. Department of Chemistry, Women University, Swabi, Pakistan. 5

Pages: 37-46

DOI: 10.18488/journal.68.2021.81.37.46

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Article History:

Received: 18 January, 2021
Revised: 22 February, 2021
Accepted: 24 March, 2021
Published: 12 April, 2021


A field study was conducted with an objective to assess thirty six wheat cultivars for tolerance, stability and enhancing productivity under optimum and stressed planting environments at Cereal crops Research Institute (CCRI), Nowshera, Pakistan during 2017-18. Experiment was laid out in randomized complete block design using three replications. Pool analysis of variance exhibited highly significant (p?0.01) variations among wheat genotypes, environments and G × E interactions for the under studied traits. In general, reduction in mean wheat genotypes for days to heading (19%) and grain yield (65%) was observed under stressed condition as compared to optimum planting environment. Across planting environments, highest grain yield was produced by wheat genotypes Pakistan-13 (3746 kg ha-1) closely followed by two other genotypes Zincol-2016 (3712 kg ha-1) and PR-122 (3671 kg ha-1). Various stress selection indices viz tolerance (TOL), mean productivity (MP), harmonic mean (HM), geometric mean productivity (GMP), stress tolerance index (STI), yield index (YI), stress susceptibility index (SSI) and yield stability index (YSI) were employed for each genotype under both environments. Correlation coefficient analysis unveiled that days to heading and grain yield had positive significant association with GM, HM MP, YI and STI. Aforementioned stress selection indices were found effective tools for identification of stress tolerant genotypes under delayed planting. On the basis of these selection indices, wheat genotypes i-e Zincol-16, Pirsabak-13, PR-122 and Pakistan-13 were found high yielding stress tolerant which could be sown under non-stressed and stressed conditions and could be used in future wheat breeding schemes.
Contribution/ Originality
The paper’s primary contribution is finding more stable, heat tolerant and high yielding bread wheat genotypes across normal and late planting environments. This study documents is vital to wheat breeders to suggest these genotypes for stress environments directly or to use for the development of new genotypes for the changing climatic conditions.


Triticum aestivum L., Stress selection indices, Normal, Late planting, Genotype × environment interaction, Correlation.


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This study received no specific financial support.

Competing Interests:

The authors declare that they have no competing interests.


All the authors of this study are very thankful to CCRI (Cereal Crops Research Institute-Nowshera) and CIMMYT (International Maize and Wheat Improvement Centre-México) for the provision of genetic material, conduction of the experiment and full support throughout.

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