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Utilization of Heat Susceptibility Index for Comparative Evaluation of Consistent Yield Performance in Wheat Under Heat Stress

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Abstract

High-yielding and heat-tolerant wheat cultivars will be crucial in establishing tolerance into the wheat breeding programme under the changing climate scenario. The current study is a step towards finding the heat-tolerant genetic resources for improving wheat breeding. The experiment was conducted with a biparental population of 82 recombinant inbred lines (RILs) developed by a cross between RAJ4014 (heat sensitive)/WH730 (heat tolerant) genotypes. Firstly, the RILs, together with the parents, were screened under timely sown (TS), late sown (LS) and temperature-controlled phenotyping facility (TCPF) simultaneously for two consecutive years (2012–2013 and 2013–2014). Based on the heat susceptibility index (HSI), 69% and 64% of RILs were identified as heat tolerant under LS and TCPF condition, respectively. Among the tested lines, 48 RILs were found to be common in both the environments. These lines were also phenotyped under TS conditions for two more crop seasons for yield and other allied traits. Combined analysis of variance showed significant yield difference across the years (2017–2018 and 2018–2019). Principal component analysis revealed positive correlation between spike length and grain yield. Thirty-five RILs having heat tolerance earlier were found with consistent high-yield performance based on 5% LSD over years. These identified RILs could be employed in future wheat breeding programmes to develop high-yielding thermo-tolerant wheat cultivars.

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Acknowledgements

Authors gratefully acknowledge the financial support in carrying out this research work from ICAR-Network Project on Functional Genomics and Genetic Modification in Crops “Project Code OXXO1347”. Assistance by Dr. Chandra Nath Mishra during writing discussion is also acknowledged.

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Authors and Affiliations

  1. Department of Biotechnology, Kurukshetra University, Kurukshetra, Haryana, 136119, India

    Kiran Devi & Sulekha Chahal

  2. Department of Biosciences and Biotechnology, Banasthali Vidyapith, Banasthali, Rajasthan, 304022, India

    Girish Chandra Pandey

  3. ICAR-Indian Institute of Wheat and Barley Research, Karnal, Haryana, 132001, India

    Kiran Devi,  Rinki & Ratan Tiwari

Authors
  1. Kiran Devi
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  2. Sulekha Chahal
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  3. Girish Chandra Pandey
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  4. Rinki
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  5. Ratan Tiwari
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Corresponding author

Correspondence to Ratan Tiwari.

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The authors declare that they have no conflict of interest.

Significant Statement

Genotypes tolerant to terminal heat stress are often not the best yielders and vice versa. From a mapping population developed for heat stress tolerance study, heat-tolerant RILs were identified having above average yield levels. These were tested for consistency in their yield performance providing desired combinations of better yield and tolerance to heat stress.

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Devi, K., Chahal, S., Pandey, G.C. et al. Utilization of Heat Susceptibility Index for Comparative Evaluation of Consistent Yield Performance in Wheat Under Heat Stress. Natl. Acad. Sci. Lett. 45, 291–295 (2022). https://doi.org/10.1007/s40009-022-01125-7

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  • DOI: https://doi.org/10.1007/s40009-022-01125-7

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