Publications of NIPGR Scientists

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Author: search.filters.author.Sharma, MohanSubject: search.filters.subject.heat stress

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    Understanding the role of phytohormones in governing heat, cold, and freezing stress response
    (Elsevier B.V., 2023) Sharma, Mohan; Saksena, Harshita B.; Botta, Halidev Krishna; Laxmi, Ashverya
    Plants are exposed to rapid fluctuations in the environmental temperature and respond differently to temperature stress through fine-tuning genetic, biochemical, and physiological changes. Plants utilize several signaling pathways including stress and phytohormone signalings to cope with high and low temperature stresses. Emerging studies have documented the role of growth and development related phytohormones, such as auxin, cytokinin, brassinosteroids, gibberellic acid, and strigolactones, in temperature stress responses. Apart from functioning in biotic stress, salicylic acid and jasmonic acid participate in alleviating temperature stress. Abscisic acid and ethylene have also been reported to be major players in regulating abiotic stresses. Changes in global temperature in recent years have drastically affected the crop productivity. Therefore manipulation of certain factors in the stress and phytohormone signaling pathways can lead to the development of crops tolerant to severe temperature stresses, thereby minimizing yield loss during harsh climatic conditions. In this chapter, we shed light on how different hormone signaling pathways facilitate plants to adapt under stressful temperatures, thereby providing them with better stress resilience and survival potential.
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    Arabidopsis target of rapamycin coordinates with transcriptional and epigenetic machinery to regulate thermotolerance
    (Frontiers Media S.A., 2021) Sharma, Mohan; Jamsheer, K.M.; Shukla, Brihaspati Narayan; Sharma, Manvi; Awasthi, Prakhar; Mahtha, Sanjeet Kumar; Yadav, Gitanjali; Laxmi, Ashverya
    Global warming exhibits profound effects on plant fitness and productivity. To withstand stress, plants sacrifice their growth and activate protective stress responses for ensuring survival. However, the switch between growth and stress is largely elusive. In the past decade, the role of the target of rapamycin (TOR) linking energy and stress signalling is emerging. Here, we have identified an important role of Glucose (Glc)-TOR signalling in plant adaptation to heat stress (HS). Glc via TOR governs the transcriptome reprogramming of a large number of genes involved in heat stress protection. Downstream to Glc-TOR, the E2Fa signalling module regulates the transcription of heat shock factors through direct recruitment of E2Fa onto their promoter regions. Also, Glc epigenetically regulates the transcription of core HS signalling genes in a TOR-dependent manner. TOR acts in concert with p300/CREB HISTONE ACETYLTRANSFERASE1 (HAC1) and dictates the epigenetic landscape of HS loci to regulate thermotolerance. Arabidopsis plants defective in TOR and HAC1 exhibited reduced thermotolerance with a decrease in the expression of core HS signalling genes. Together, our findings reveal a mechanistic framework in which Glc-TOR signalling through different modules integrates stress and energy signalling to regulate thermotolerance.