Seed Priming: Mechanisms, Methods, and Applications for Enhancing Crop Resilience in Fragile Ecosystems
Abstract
Seed priming is a pre-sowing technique involving controlled hydration and dehydration to activate pregerminative metabolism without radicle emergence. This review synthesizes the principles, methods, and multifaceted benefits of seed priming as a pivotal strategy for enhancing crop establishment and stress resilience. Priming improves germination uniformity, vigour, and yield across major cereals, pulses, and oilseeds by triggering complex physiological, biochemical, and molecular responses, including antioxidant system activation, DNA repair, and stress-responsive gene expression. Conventional methods such as hydropriming, osmo-priming, and biopriming, alongside advanced techniques like nanopriming and physical priming, are detailed. The paper highlights crop-specific applications, underscores the technology's role in mitigating abiotic stresses in fragile ecosystems, and discusses its limitations and future challenges. As a cost-effective and accessible intervention, seed priming is a vital tool for sustainable agricultural intensification and climate adaptation.
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Introduction
Seeds are the cornerstone of agriculture, ensuring genetic continuity and food security. High-quality seeds are fundamental for uniform plant establishment and optimal productivity. Seed priming is a pre-sowing biotechnological practice that involves controlled hydration to initiate metabolic processes, followed by drying to prevent radicle protrusion. This technique, pioneered by Heydecker et al. (1973), enhances germination speed, uniformity, seedling vigour, and stress tolerance, leading to improved crop performance, especially under adverse conditions.
The global challenge of cultivating crops in fragile ecosystems—marked by drought, salinity, and extreme temperatures— necessitates resilient agricultural strategies. Seed priming offers a pragmatic, low-cost solution by inducing a "priming memory," enabling plants to mount faster and more robust cellular defences against subsequent stresses. This review comprehensively examines the benefits, underlying principles, physiological-biochemical-molecular mechanisms, diverse methods, and field applications of seed priming in major crops. It also critically addresses the limitations and future prospects of this technology for sustainable crop production.
Conclusion
Seed priming is a scientifically robust and practically viable technology to enhance crop performance in fragile ecosystems. By activating a cascade of pre-adaptive mechanisms, it equips plants to withstand environmental stresses from the very start of their life cycle. Its simplicity and cost-effectiveness make it particularly suitable for resource-poor farming systems.
To fully realize its potential, future efforts should focus on:
- Protocol Standardization: Developing crop- and environment-specific priming protocols.
- Molecular Breeding: Identifying and integrating genetic markers associated with superior priming response into breeding programs.
- Innovative Delivery Systems: Exploring nano-formulations and seed coating technologies for easier application and extended efficacy.
- Policy and Extension Support: Strengthening extension services to bridge the gap between research and widespread farmer adoption.
Seed priming stands as a critical component of sustainable intensification strategies, offering a pathway to stabilize yields and enhance food security in the face of climate change.
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