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Role of Phytohormones in Regulating Heat Stress Acclimation in Agricultural Crops

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Abstract

Heat stress (HS) seriously affects crop growth, causing significant crop yield losses worldwide. The regulatory mechanisms controlling HS tolerance in plants are not well understood. Phytohormones are important molecules for coordinating myriad of phenomena related to plant growth and development. They are also essential endogenous signaling molecules that actively mediate numerous physiological responses under abiotic stress by triggering stress-responsive regulatory genes involved in plant growth. This review updates the central role of various phytohormones—indole acetic acid, gibberellic acid, abscisic acid, cytokinins, ethylene, salicylic acid, brassinosteroids, strigolactone, and jasmonic acid—in regulating the HS response so that plants can adapt to increasing temperature stress. We also reveal how these stress-responsive phytohormones switch on various regulatory gene(s) and genes encoding antioxidants and heat shock proteins (HSPs) to combat HS in various plant species.

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Acknowledgements

UCJ conceived the idea and wrote the MS with HN and KHMS. UCJ acknowledges support from the Indian Council of Agricultural Research (ICAR), New Delhi, India. HN is thankful to DBT, DST, MOA, UWA (Perth), ICARDA, and World Vegetable Center for supporting research work on heat stress in food crops.

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Authors and Affiliations

  1. ICAR-Indian Institute of Pulses Research (IIPR), Kanpur, 208024, India

    Uday Chand Jha

  2. Department of Botany, Panjab University, Chandigarh, India

    Harsh Nayyar

  3. The UWA Institute of Agriculture, The University of Western Australia, Perth, WA, 6001, Australia

    Kadambot H. M. Siddique

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  1. Uday Chand Jha
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  2. Harsh Nayyar
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  3. Kadambot H. M. Siddique
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UCJ conceived the idea and written the MS along with HN and KHMS. HN gave assisted in giving concept of Fig.1 and Fig.2. KHMS edited the MS and improved the quality of MS. All authors read and approved the MS.

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Correspondence to Uday Chand Jha.

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Jha, U.C., Nayyar, H. & Siddique, K.H.M. Role of Phytohormones in Regulating Heat Stress Acclimation in Agricultural Crops. J Plant Growth Regul 41, 1041–1064 (2022). https://doi.org/10.1007/s00344-021-10362-x

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