Drying without senescence in resurrection plants.
Drying without senescence in resurrection plants.
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DOI：
10.3389/fpls.2014.00036
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发表时间：
2014
影响因子：
5.6
通讯作者：
Neale AD
中科院分区：
文献类型：
--
作者：
Griffiths CA;Gaff DF;Neale AD
利用Craterostigma plantagineum、C. wilmsii、旱生植物矮旱生植物、Tortula ruralis和Sporobolus stapfianus的研究提供了一些关于这些植物利用干燥耐受机制以允许它们在极端不利的环境条件下持续存在的见解。在严重脱水期间，用来确保细胞保存的一些机制似乎是复活植物所特有的。除了在干燥和再水化过程中保存重要细胞组分的能力之外，这些机制还包括响应于水可用性的变化而快速下调生长相关代谢的能力，以及抑制脱水诱导的衰老程序的能力，从而能够在降雨事件后快速重建光合能力。对非复活植物叶片衰老分子机制的深入研究揭示了一个多层次的调控网络控制着细胞程序性死亡途径。然而，人们对复活植物在干燥过程中避免经历与干旱相关的衰老的分子机制知之甚少。为了在干燥环境中生存，多年生复活草S。stapfianus必须在7天或更长时间内缓慢进行。在相对含水量（RWC）达到60%之前离体的叶片是脱水敏感的，这表明S.当叶片RWC下降到60%时，stapfianus。虽然在脱水期间保持附着于植物的一些较老的叶子将衰老，这表明脱水诱导的衰老可能受到叶龄或单个叶子中的脱水速率的影响，但大多数叶子不会衰老。相反，这些叶子会在空气中干燥，并在复水后完全恢复。因此，似乎有可能在复活植物的年轻叶组织中表达的基因能够抑制干旱相关的衰老途径。由于很少有研究直接解决了这一现象，本文旨在讨论目前的文献周围的激活和抑制衰老途径，以及这些途径如何可能不同的复活植物。
Research into extreme drought tolerance in resurrection plants using species such as Craterostigma plantagineum, C. wilmsii, Xerophyta humilis, Tortula ruralis, and Sporobolus stapfianus has provided some insight into the desiccation tolerance mechanisms utilized by these plants to allow them to persist under extremely adverse environmental conditions. Some of the mechanisms used to ensure cellular preservation during severe dehydration appear to be peculiar to resurrection plants. Apart from the ability to preserve vital cellular components during drying and rehydration, such mechanisms include the ability to down-regulate growth-related metabolism rapidly in response to changes in water availability, and the ability to inhibit dehydration-induced senescence programs enabling reconstitution of photosynthetic capacity quickly following a rainfall event. Extensive research on the molecular mechanism of leaf senescence in non-resurrection plants has revealed a multi-layered regulatory network operates to control programed cell death pathways. However, very little is known about the molecular mechanisms that resurrection plants employ to avoid undergoing drought-related senescence during the desiccation process. To survive desiccation, dehydration in the perennial resurrection grass S. stapfianus must proceed slowly over a period of 7 days or more. Leaves detached from the plant before 60% relative water content (RWC) is attained are desiccation-sensitive indicating that desiccation tolerance is conferred in vegetative tissue of S. stapfianus when the leaf RWC has declined to 60%. Whilst some older leaves remaining attached to the plant during dehydration will senesce, suggesting dehydration-induced senescence may be influenced by leaf age or the rate of dehydration in individual leaves, the majority of leaves do not senesce. Rather these leaves dehydrate to air-dryness and revive fully following rehydration. Hence it seems likely that there are genes expressed in younger leaf tissues of resurrection plants that enable suppression of drought-related senescence pathways. As very few studies have directly addressed this phenomenon, this review aims to discuss current literature surrounding the activation and suppression of senescence pathways and how these pathways may differ in resurrection plants.
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DOI：
10.1073/pnas.0704901104
发表时间：
2007-12-11
影响因子：
11.1
作者：
Chen, Zhongying;Agnew, Jennifer L.;Kunkel, Barbara N.
通讯作者：
Kunkel, Barbara N.
影响因子：
6.4
作者：
BACK, A;RICHMOND, AE
通讯作者：
RICHMOND, AE
影响因子：
4.2
作者：
Blomstedt, Cecilia K.;Griffiths, Cara A.;Neale, Alan D.
通讯作者：
Neale, Alan D.
影响因子：
4.2
作者：
Di Blasi, S;Puliga, S;Vazzana, C
通讯作者：
Vazzana, C
影响因子：
2.6
作者：
Bartels, D
通讯作者：
Bartels, D