Priming memory invokes seed stress-tolerance
Priming memory invokes seed stress-tolerance
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DOI：
10.1016/j.envexpbot.2012.03.005
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发表时间：
2013-10-01
影响因子：
5.7
通讯作者：
Arora, R.
中科院分区：
文献类型：
--
作者：
Chen, K.;Arora, R.
种子灌浆是播种前的一种处理方法，可以在不允许胚根出现的情况下为种子提供部分水分。因此，引种后的种子具有提前萌发的能力，并表现出更高的发芽率和均匀性。此外，种子启动通常与提高发芽种子的抗逆性有关，其细胞机制尚不清楚。在这里，我们提出了一个假设的模型来说明启动诱导的应激耐受性的细胞生理学，可能通过两种策略实现。首先，种子启动启动萌发相关的活动（如呼吸、胚乳弱化、基因转录和翻译等），促进静止的干燥种子进入萌发状态，从而提高萌发势。其次，启动对种子施加非生物胁迫，抑制胚根突起，但刺激胁迫反应（如LEAs的积累），潜在地诱导交叉耐受。这两种策略共同构成了种子的“启动记忆”，它可以在随后的压力暴露中被招募，并介导萌发启动种子的更大的压力耐受性。(c) 2012 Elsevier B.V.版权所有
Seed priming is a pre-sowing treatment that partially hydrates seeds without allowing radicle emergence. Consequently, primed seeds are equipped with advanced germination and exhibit improved germination rate and uniformity. Moreover, seed priming is often implicated in improving the stress-tolerance of germinating seeds, cellular mechanism of which is not well understood. Here we propose a hypothetical model illustrating the cellular physiology of priming-induced stress-tolerance, likely achieved via two strategies. First, seed priming sets in motion germination-related activities (e.g. respiration, endosperm weakening, and gene transcription and translation, etc.) that facilitate the transition of quiescent dry seeds into germinating state and lead to improved germination potential. Secondly, priming imposes abiotic stress on seeds that represses radicle protrusion but stimulates stress responses (e.g. accumulation of LEAs), potentially inducing cross-tolerance. Together, these two strategies constitute a 'priming memory' in seeds, which can be recruited upon a subsequent stress-exposure and mediates greater stress-tolerance of germinating primed seeds. (c) 2012 Elsevier B.V. All rights reserved.