Design Principles of Plant Thermotolerance: Integrating Photosynthesis, Reproduction, and Field Resilience in a Warming Climate.

Reproductive thermotolerance: from flower development to seed initiation.

Global warming has increased the frequency and intensity of extreme heat events, threatening crop productivity and food security. Plant reproductive development is particularly vulnerable to high temperature, and even brief heat episodes can markedly reduce seed set. Heat stress disrupts multiple reproductive stages, including flowering, male and female gametophyte development, pollination, fertilization, and early seed development. Thus, reproductive thermotolerance requires coordinated regulation across developmental stages and tissue systems. In this review, we synthesize current knowledge of how high temperature affects plant reproduction from floral initiation to seed formation and summarize the underlying molecular mechanisms, including heat sensing, proteostasis, redox regulation, metabolism, and hormonal control. We further discuss strategies for improving reproductive heat resilience through breeding, biotechnology, and crop management. By framing reproductive thermotolerance as an integrated property of cellular and tissue homeostasis, this review provides a conceptual foundation for future mechanistic studies and for developing crops better adapted to a warming climate.

Emerging molecules for drought resilience in plants

Abiotic stress response mechanisms, molecular mitigation, and future strategies in millets

Abiotic stresses, such as drought, salinity, temperature extremes, heavy metals, and pesticide toxicity, severely impact plant growth and productivity, primarily through the accumulation of reactive oxygen species (ROS) and metabolic imbalances. In the era of climate change and declining agricultural sustainability, the development of stress-resilient crops has become essential for ensuring global food and nutritional security. Millets, also known as ‘super grain’ or ‘miracle grain’ due to their nutritional value, are recognized for their inherent resilience and exhibit superior adaptability in arid and semi-arid ecosystems towards these abiotic stresses. It is due to their C4 photosynthetic efficiency, rapid life cycles, and deep root architecture. These cereals deploy integrated morphological, physiological, biochemical, and molecular mechanisms, including antioxidant defense systems, osmolyte accumulation, stress-responsive gene expression, and hormonal regulation to maintain homeostasis under stress. Despite these traits, millet improvement lags behind that of major cereals due to limited breeding efforts and underdeveloped molecular resources. This review focuses on recent advances in stress tolerance mechanisms, highlighting omics-driven insights, microbial and phytohormonal mitigation strategies, and exploring genome editing and modern breeding tools, such as CRISPR/Cas9 and genome-wide association studies (GWAS), for developing climate-resilient millet cultivars suitable for sustainable agriculture and future food security. The article explores the development of climate-resilient millet varieties by integrating molecular innovations into traditional agronomic practices, which will provide future benefits framework for developing new varieties. Overall, the article will deepen understanding of the molecular processes underlying stress responses and provide targeted solutions to enhance stress tolerance in millets.

Sustainable Production of Solanaceous Vegetable Crops Under Climate Change: The Role of Nanoparticles in Enhancing Abiotic Stress Adaptation

Climate change represents a major global challenge that threatens agricultural productivity, ecosystem stability, and food security by intensifying abiotic stresses such as drought, salinity, and extreme temperatures. Solanaceous crops, which are economically and nutritionally important worldwide, are highly sensitive to these stresses, leading to oxidative damage, impaired photosynthesis, and reduced yield and quality. Nanotechnology has emerged as a promising approach to mitigate these adverse effects. Due to their unique physicochemical properties, nanoparticles (NPs) enhance nutrient uptake, improve water-use efficiency, and regulate plant metabolic processes. They also activate antioxidant defense systems, reduce reactive oxygen species (ROS), and improve the delivery efficiency of growth regulators and bioactive compounds. This review synthesizes recent literature on abiotic stress responses in solanaceous crops and evaluates the role of nanoparticles as mitigation strategies, focusing on physiological, biochemical, and molecular mechanisms. The scope includes drought, salinity, and temperature stresses, as well as nano-enabled applications such as nano-carriers and nano-sensors. Overall, nanoparticle applications improve plant tolerance by enhancing antioxidant activity, regulating stress-responsive pathways, and improving resource-use efficiency, thereby contributing to increased crop productivity under climate change conditions. However, challenges related to nanoparticle toxicity and environmental risks remain, emphasizing the need for optimized and safe application strategies. These findings highlight the potential of nanotechnology as a sustainable tool to enhance the resilience and productivity of solanaceous crops under changing climatic conditions. This review highlights that nanoparticles can enhance abiotic stress tolerance in solanaceous crops by improving antioxidant activity, photosynthesis, nutrient uptake, and water-use efficiency under adverse environmental conditions. Overall, nanotechnology represents a promising strategy for sustainable crop production under climate change, although further studies are needed to ensure its environmental safety and long-term applicability. This review provides a comprehensive overview of abiotic stress effects on solanaceous crops and highlights the role of nanoparticles as a sustainable tool to enhance plant tolerance, productivity, and resilience under climate change conditions.

Precision Nanoparticles for Plant Thermotolerance: From Molecular Mechanisms to Scalable Agriculture.

Heat stress is emerging as a dominant constraint on global crop productivity by destabilizing membranes, disrupting photosynthesis, impairing reproductive development, and accelerating oxidative damage. In recent years, nanoparticles (NPs) have been widely proposed as new regulators of plants thermotolerance, but available literature is rather fragmented, often descriptive and frequently inconsistent across experimental systems. This review provides a critical synthesis of the nanoparticle-mediated heat-stress resistance of the most important crops, such as rice, wheat, maize, tomato, and soybean in a mechanistic and systems-level approach. We propose that NPs act as redox modulators, triggering ROS-Ca²⁺-MAPK signaling cascades that activate heat shock transcription factors, stress-responsive gene networks, and hormonal reprogramming, converging downstream on antioxidant reinforcement, membrane stabilization, osmotic adjustment, and photosynthetic protection. Critically, this adaptive response is neither universal nor unconditional; physicochemical parameters including particle size, surface charge, composition, and dissolution kinetics determine whether NP exposure drives hormetic priming or phytotoxic disruption, with this threshold further modulated by crop genotype, developmental stage, and application strategy. Systematic comparison of contradictory findings reveals a mechanistically interpretable pattern: NPs functioning as metabolic co-factors, particularly zinc, selenium, and silicon, consistently confer more stable thermotolerance than non-metabolic exogenous antioxidants such as cerium oxide, which exhibit a narrower efficacy-to-toxicity window. We further identify standardized experimental reporting, genetic verification of HSF-HSP mechanistic claims, multi-location field validation, crop-nutritional-profile-guided NP design, and mandatory pre-commercial ecosystem safety assessment as the critical imperatives required before nanoparticle-enabled thermotolerance can be responsibly deployed at scale.

Microbe-Mediated Abiotic Stress Tolerance in Rice (Oryza sativa L.) as a Strategy for Climate Change Adaptation

: Rice ( Oryza sativa L.) is central to global food security, yet its production systems remain highly vulnerable to environmental pressures. Climate change is increasing the frequency and severity of abiotic stresses, including drought, salinity, extreme temperatures, flooding, and heavy metal toxicity, which significantly reduce global rice productivity. Conventional strategies, including breeding and genetic engineering, have improved stress tolerance; however, their effectiveness is often constrained by long development timelines, complex genetic regulation, and limited performance under multiple concurrent stresses. In this context, plant-associated microorganisms have emerged as a sustainable and promising approach to enhancing rice plant resilience. This review synthesizes current knowledge on beneficial microbes such as plant growth promoting rhizobacteria (PGPR), arbuscular mycorrhizal fungi (AMF), endophytes