Institutional Publications

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Author: search.filters.author.Laxmi, AshveryaSubject: search.filters.subject.heat stress

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    Nitric oxide-mediated thermomemory: a new perspective on plant heat stress resilience
    (Frontiers Media S.A., 2025) Naaz, Sheeba; Pande, Anjali; Laxmi, Ashverya
    In the intricate world of plant responses to environmental stress, the concept of thermomemory has emerged as a fascinating and complex phenomenon. Plants, as sessile organisms, continually face the challenge of adapting to fluctuating climates, and the ability to "remember" prior heat stress encounters, a phenomenon known as thermomemory is a testament to their remarkable adaptability. Nitric oxide (NO), a versatile signaling molecule in plant physiology, has been implicated in a myriad of cellular processes crucial for stress adaptation. From its involvement in stomatal regulation to its influence on gene expression and antioxidant defense mechanisms, NO emerges as a central orchestrator in the plant's response to elevated temperatures. Exploration of NO-mediated pathways provides insights into how plants not only cope with immediate heat stress but also retain a memory of these encounters. Unraveling the molecular intricacies of NO's involvement in thermomemory enhances our understanding of the sophisticated strategies employed by plants to navigate a changing climate, offering potential avenues for innovative approaches to enhancing crop resilience and sustainable agriculture.
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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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    Type-A response regulators negatively mediate heat stress response by altering redox homeostasis in Arabidopsis
    (Frontiers Media S.A., 2022) Jindal, Sunita; Kerchev, Pavel; Berka, Miroslav; Černý, Martin; Botta, Halidev Krishna; Laxmi, Ashverya; Brzobohatý, Břetislav
    Besides the long-standing role of cytokinins (CKs) as growth regulators, their current positioning at the interface of development and stress responses is coming into recognition. The current evidence suggests the notion that CKs are involved in heat stress response (HSR), however, the role of CK signaling components is still elusive. In this study, we have identified a role of the CK signaling components type-A Arabidopsis response regulators (ARRs) in HSR in Arabidopsis. The mutants of multiple type-A ARR genes exhibit improved basal and acquired thermotolerance and, altered response to oxidative stress in our physiological analyses. Through proteomics profiling, we show that the type-A arr mutants experience a 'stress-primed' state enabling them to respond more efficiently upon exposure to real stress stimuli. A substantial number of proteins that are involved in the heat-acclimatization process such as the proteins related to cellular redox status and heat shock, are already altered in the type-A arr mutants without a prior exposure to stress conditions. The metabolomics analyses further reveal that the mutants accumulate higher amounts of α-and γ-tocopherols, which are important antioxidants for protection against oxidative damage. Collectively, our results suggest that the type-A ARRs play an important role in heat stress response by affecting the redox homeostasis in Arabidopsis.
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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.