Advances in Seed Priming by Amitava Rakshit & Harikesh Bahadur Singh

Author:Amitava Rakshit & Harikesh Bahadur Singh
Language: eng
Format: epub
Publisher: Springer Singapore, Singapore

10.2 Seed Priming

Seed priming is a simple, safe, economic, and effective approach for enhancement of seed germination, early seedling growth, and yield under stressed and non-stressed conditions (Sedghi et al. 2010). Seed priming is a form of seed preparation in which seeds are presoaked before planting with a certain solution that allows partial hydration but not germination and redried to original moisture content (Ahmad et al. 2012). The seed priming process is a physiological method that involves seed hydration (usually within 10–20% of full imbibition) (Pill 1995), sufficient to permit pre-germinative metabolic events to proceed, but insufficient to allow radicle protrusion (Bradford 1986). Primed seeds germinate faster and more uniformly than the non-primed ones.

During priming, the germination process is not completed, but metabolic activities for radical protrusion may be initiated (Heydecker et al. 1973). At the cellular level, few processes have been described to act during priming, some of these being activation of cell cycle (De Castro et al. 2000) and mobilization of storage proteins (Gallardo et al. 2001). The priming process induces the rate of seed germination and is associated with the initiation of germination-related processes (Soeda et al. 2005) and repair processes (Sivritepe and Dourado 1995) and increases various free radical-scavenging enzymes, such as superoxide dismutase, catalase, and peroxidase (Gallardo et al. 2001).

Several seed priming methods were successfully used in agriculture for seed conditioning to accelerate the germination rate and improve the seedling uniformity (Nouman et al. 2012; Aghbolaghi and Sedghi 2014; Bagheri 2014; Lara et al. 2014). Moreover, seed priming helps many crops to neutralize the adverse effects of abiotic stress (Ashraf and Foolad 2005; Zhang et al. 2012; Hameed et al. 2013; Jisha et al. 2013; Jisha and Puthur 2016).

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