Interaction effect of heat shock and seed priming on storability of Agropyron elongatum

Bahreh, Malihe Akbarpour; Zadeh, Farzad Sharif

doi:10.4038/jas.v10i1.8045

Cited by 1 publication

(2 citation statements)

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“…Evidence of benefits for post-priming survival is scarce. To our knowledge, results supporting an anti-deterioration effect of priming have probably only been reported for seed lots in the vulnerable stage 6 , 25 , 47 – 49 . For NPB-17, non-primed seeds were sensitive to ageing and no “plateau” took out at the survival curve.…”

Section: Discussionmentioning

confidence: 83%

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Timing for antioxidant-priming against rice seed ageing: optimal only in non-resistant stage

Xia

Yin

et al. 2020

Sci Rep

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complement to storage. One popular form of seed enhancement is priming which contains a hydrate-dehydrate process before sowing to invigorate seeds and promote germination 13 , hence its name "priming" which means promotion at the start. Seed deterioration as a result of ageing is attributed to the imbalance in the reductive /oxidative (redox) state caused by the accumulation of reactive oxygen species (ROS) which accelerate viability loss 8,14-16. Antioxidant priming has been shown to be effective in removing ROS 17 , boosting antioxidant enzymes 17 , and, through inhibition of lipid oxidation, increasing cell membrane integrity (CMI) as measured by electrical conductivity (EC) 18. The antioxidant effect is achieved by holding the seed in a hydrated state before radicle protrusion 19. This state is to make full use of antioxidant enzymes and antioxidants to scavenge ROS 6 and to apply exogenous antioxidants during priming 20. During storage the seed is dehydrated and antioxidant enzymes are inactive 21. Antioxidant priming is therefore beneficial to the activation of antioxidant system. However, its exact role in subsequent storage, indicated by post-priming seed survival, is much more ambiguous 6. One probable reason is that it promotes radicleprotrusion during which a seed loses its desiccation tolerance 22 and therefore suffers cell membrane injury during desiccation 21. In practice there is hardly any standard for priming as a method to prolong seed longevity 20. Could antioxidant priming act as a regular method of boosting seed longevity, and if so, when should a seed lot be primed? Priming has been found to be more likely to benefit seeds at the vulnerable stage 6. Our question was whether would antioxidant priming prolong or abbreviate the resistant stage? Would it decelerate viability loss? To better understand the exact role of antioxidant priming, antioxidant 15 and oxidant priming were applied to rice seeds to study post-priming survival. Rice is the model species for cereals and ranks third in the world's crop production, following maize and wheat. It is also the staple food in tropical or subtropical areas where temperatures are high. Without cold storage, environments for seed preservation are inclement and seed enhancement can be more useful. The original germination percentage (GP) of rice (Nipponbare, NPB) seeds in this study was already 97%, hard to improve. So, priming could only benefit seeds through prolonging the resistant stage or decelerating viability loss rather than increasing GP. Two hypotheses were proposed: (1) ageing resistance significantly declines as a result of storage before GP decreases; (2) antioxidant priming increases ageing resistance at high GP and decelerates viability loss. This study sought to discover an optimal time point for seed priming against viability loss, which can be generalized to other species and circumstances of storage and perhaps extended to be incorporated with other types of seed enhancement. Results Seed longevity under AAA responded negatively to t...

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Section: Discussionmentioning

confidence: 83%

“…Priming can be complementary to both seed storage and seed regeneration ( Table 6). www.nature.com/scientificreports/ priming have probably only been reported for seed lots in the vulnerable stage 6,25,[47][48][49] . For NPB-17, non-primed seeds were sensitive to ageing and no "plateau" took out at the survival curve.…”

Section: Discussionmentioning

confidence: 99%