Crosstalk Between Abiotic and Biotic Stress Responses in Plants: Mechanisms, Outcomes, and Implications for Crop Improvement

Plants growing under field conditions often face multiple stress factors concurrently. These can include extremes of drought, salinity, or temperature coupled with attacks from pathogens or herbivores. Understanding how plants perceive, integrate, and respond to overlapping abiotic and biotic challenges is critical for guiding future crop improvement efforts. Complex signaling networks, involving phytohormones, transcriptional reprogramming, and epigenetic modifications, shape outcomes that can differ markedly from those elicited by individual stressors. This review examines how hormonal crosstalk and shared signaling nodes influence plant defense and tolerance mechanisms, explores specific case studies of simultaneous stresses, and considers the implications for breeding, biotechnological interventions, and agronomic management strategies. Key knowledge gaps and emerging research directions are discussed, emphasizing the urgency of interdisciplinary approaches. Harnessing insights into stress crosstalk promises to improve crop resilience and secure agricultural productivity in the face of global climate change and increasing pathogen pressures.