Plant Physiological Responses to Abiotic Stress for Climate-Resilient Agriculture: An Integrative Review
DOI:
https://doi.org/10.67756/jgemr.v1i2.48Keywords:
Abiotic Stress; Stress Signaling; Redox Homeostasis; Multi-Stress Tolerance; Climate-Resilient Agriculture.Abstract
Climate change is increasing the frequency, intensity, and co-occurrence of drought, salinity, heat, cold, flooding, and other abiotic constraints that destabilize crop productivity. Because crop failure emerges from physiological dysfunction before it becomes visible as yield loss, understanding plant physiological responses provides a critical bridge between basic stress biology and climate-resilient agriculture. This study used a qualitative library-research design with an integrative thematic synthesis of 35 peer-reviewed references, emphasizing recent literature while retaining foundational studies required to explain core mechanisms. Literature was organized around five analytical themes: stress perception and signaling, water relations and gas exchange, photosynthetic and metabolic stability, ionic and redox homeostasis, and recovery/acclimation under single and combined stresses. The synthesis shows that abiotic stresses differ in their primary injuries but converge on a limited set of physiological bottlenecks: loss of cellular water status, stomatal and mesophyll limitations to CO₂ diffusion, disruption of photosystems and respiration, membrane destabilization, ion imbalance, excessive reactive oxygen species, and altered source–sink relations. Resilient plants avoid catastrophic failure through coordinated stomatal regulation, root-system plasticity, osmotic adjustment, ion exclusion and compartmentation, antioxidant defense, heat-shock and cold-acclimation programs, hypoxia responses, hormonal crosstalk, and stress memory. Importantly, responses to combined stresses cannot be predicted by simply adding single-stress responses; the dominant stressor, stress sequence, developmental stage, and genotype can change both the direction and magnitude of acclimation. For climate-resilient agriculture, the most promising translation is therefore not selection for a single stress marker, but physiology-informed breeding and management that target yield stability, water-use efficiency, photosynthetic persistence, recovery capacity, and multi-stress tolerance. Integration of high-throughput phenotyping, genomic breeding, CRISPR-based editing, beneficial microorganisms, biostimulants, priming, and climate-smart crop management can accelerate the conversion of physiological knowledge into field resilience. The review concludes that future research should prioritize realistic stress combinations, recovery dynamics, reproductive-stage sensitivity, genotype-by-environment interactions, and field validation of mechanistic traits.
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