The Effect of Priming on the Rate and Uniformity of Germination of Endive Seed

Bekendam, J.; Pijlen, J.G. van; Kraak, H.L.

doi:10.17660/actahortic.1987.215.28

Cited by 5 publications

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“…However, there have been reports of delayed germination and/or emergence in primed seeds that are dried back, relative to primed but not dried back seeds, owing to the extra time needed for rehydration, though other beneficial effects of priming are conserved [203,232]. Additionally, deterioration of seeds in storage has been reported when primed seeds were dried back in different species, such as Lycopersicon esculentum [233], Cichorium endivia [234], and L. sativa [235]. Tarquis and Bradford [236] stated that though pre-hydration treatments caused an increased germination rate, drying back predisposed L. sativa seeds to loss of storability.…”

Section: The Seed Priming Technology Overviewmentioning

confidence: 99%

Oxidative Stress, Ageing and Methods of Seed Invigoration: An Overview and Perspectives

et al. 2021

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The maintenance of seed quality during the long-term conservation of plant genetic resources is crucial for averting the projected food crises that are linked to the changing climate and rising world population. However, ageing-induced loss of seed vigour and viability during storage remains an inevitable process that compromises productivity in several orthodox-seeded crop species. Seed ageing under prolonged storage, which can occur even under optimal conditions, induces several modifications capable of causing loss of intrinsic physiological quality traits, including germination capacity and vigour, and stand establishment. The problems posed by seed ageing have motivated the development of various techniques for mitigating their detrimental effects. These invigoration techniques generally fall within one of two categories: (1) priming or pre-hydrating seeds in a solution for improved post-harvest performance, or (2) post-storage reinvigoration which often involves soaking seeds recovered from storage in a solution. Seed priming methods are generally divided into classical (hydropriming, osmopriming, redox priming, biostimulant priming, etc.) and advanced (nanopriming, magnetopriming and priming using other physical agents) techniques. With the increasing popularity of seed invigoration techniques to achieve the much-desired enhanced productivity and resilience in the face of a changing climate, there is an urgent need to explore these techniques effectively (in addition to other important practices such as plant breeding, fertilizer application, and the control of pests and diseases). This review aims to provide an overview of ageing in orthodox seeds and invigoration techniques that can enhance desirable agronomic and physiological characters.

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Section: The Seed Priming Technology Overviewmentioning

confidence: 99%

Oxidative Stress, Ageing and Methods of Seed Invigoration: An Overview and Perspectives

et al. 2021

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“…However, there have been reports of delayed germination and/or emergence in primed seeds that are dried back, relative to primed but not dried back seeds, owing to the extra time needed for rehydration though other beneficial effects of priming are conserved (Brocklehurst and Dearman, 1983;Akbar, 2008;Sivasubramaniam et al, 2011). Additionally, deterioration of seeds in storage has been reported when primed seeds were dried back in different species like Lycopersicon esculentum (Alvarado and Bradford, 1988), Cichorium endivia (Bekendam et al, 1987) and…”

Section: The Seed Priming Technology Overviewmentioning

confidence: 99%

Physiological and biochemical investigations into the reinvigoration of deteriorated Brassica oleracea L. (Cabbage) and Lactuca sativa L. (Lettuce) seeds with antioxidants and inorganic salt solutions.

Adetunji

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This study focused on reinvigorating deteriorated Brassica oleracea L. (cabbage) and Lactuca sativa L. (lettuce) seeds with antioxidants and inorganic (electrolysed and non-electrolysed) salt solutions. All pre-treatment solutions were applied to fresh (control) and controlled deteriorated (CDd) seeds at 75% viability (P75), 50% viability (P50) and 25% viability (P25). The pre-hydration treatments were compared in terms of their effects on seed germination, seedling vigour, electrolyte conductivity (EC), accumulation of lipid peroxidation products, protein carbonylation (PC), antioxidant enzymes and germination enzymes. The study also investigated the effects of invigorating CDd seeds with selected antioxidants on subsequent seedling growth, gas exchange and photochemistry under greenhouse conditions. Controlled deterioration, in general, resulted in the loss of seed vigour and viability but at higher rates in lettuce than cabbage, and increased EC and PC, and lowered antioxidant and germination enzymes activities in both species. However, significant lipid peroxidation was only recorded in lettuce seeds. Antioxidant pre-treatments enhanced viability of CDd seeds of cabbage at P25 and lettuce at P50 and P25, and improved seedling vigour of fresh, P75 and P50 cabbage, and P50 and P25 lettuce seeds. Antioxidant pretreatments reduced EC and lipid peroxidation in lettuce seeds, while PC was reduced in both species. The treatments also elevated antioxidant and germination enzymes activities in P25 cabbage seeds and P50 and P25 lettuce seeds. The inorganic salt pre-treatments did not enhance percentage seedling production in CDd cabbage seeds. However, in CDd lettuce seeds, Cacontaining solutions and electolysed (cathodic water) treatments promoted percentage normal seedling production and enhanced seedling vigour irrespective of pre-treatment solution pH or seed deterioration level. In the greenhouse studies, certain antioxidants promoted seedling vigour and leaf area in both species and enhanced shoot dry weight and gas exchange in lettuce. In summary, CDd lettuce seeds responded better to both types of invigoration (i.e., antioxidants and inorganic salt solutions) than cabbage seeds, while antioxidants appeared to be relatively more beneficial than inorganic salts in both species. The results suggest that the benefits of certain pre-treatment solutions were based on the enhancement of the activities of key antioxidant and germination enzymes, and the efficiency of photosynthesis at the early stages of growth. The results argue for the use of these seed pre-hydration treatments for mitigating poor stand establishment brought about by seed ageing, and as a useful approach to reinvigorating seeds in long-term storage collections for ensuring global food security.

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