A comparative study of the hormonal response to high temperatures and stress reiteration in three Labiatae species
A comparative study of the hormonal response to high temperatures and stress reiteration in three Labiatae species
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DOI：
10.1016/j.envexpbot.2012.05.001
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发表时间：
2013-10-01
影响因子：
5.7
通讯作者：
Munne-Bosch, Sergi
中科院分区：
文献类型：
--
作者：
Amparo Asensi-Fabado, Maria;Olivan, Arancha;Munne-Bosch, Sergi
地中海植物通常面临多种压力，这些压力可能同时发生，也可能在其一生的不同时期发生。本研究比较了迷迭香（Rosmarinus officinalis L.）、鼠尾草（Salvia officinalis L.）和柠檬香（Melissa officinalis L.）三种唇科植物对高温的激素反应。随后，将连续5天暴露于高温胁迫下的植物与首次经历高温胁迫的植物（对照组）进行比较。尽管这三个物种对单一的热胁迫事件表现出相似的耐受性，但胁迫复发对每个物种的影响不同。香蜂草是对重复热胁迫最敏感的品种，在重复热胁迫下，其相对含水量下降，α -生育酚和水杨酸（SA）含量增加。在迷迭香和鼠尾草中观察到一些驯化反应，包括迷迭香中含水量的提高和茉莉酸水平的降低，以及鼠尾草中脱落酸（ABA）和丙二醛（MDA）水平的降低。此外，植物对热胁迫和水分亏缺组合的反应在先前暴露于热胁迫的植物中进行了评估，并与对照进行了比较。迷迭香和鼠尾草比柠檬香蜂草更有抵抗力，柠檬香蜂草在压力结合时死亡。尽管胁迫前暴露对迷迭香和鼠尾草的F-v/F-m、MDA和相对含水量没有任何影响，但却导致两种植物的α -生育酚水平升高。不同物种的激素反应不同：鼠尾草的激素含量没有变化，而迷迭香由于反复应激暴露而显示出ABA增加和SA水平降低。总的来说，每个物种和应激情景的α -生育酚和激素水平都有不同的应激印记，这导致迷迭香和鼠尾草的保护作用相似。(c) 2012 Elsevier B.V.版权所有
Mediterranean plants are usually exposed to a combination of stresses, which may occur simultaneously or at different times throughout their life. Here, the hormonal response to high temperatures was compared in plants of three Labiatae species, including rosemary (Rosmarinus officinalis L.), sage (Salvia officinalis L.) and lemon balm (Melissa officinalis L.). Plants exposed to increasing temperatures for 5 days were subsequently exposed to heat stress and compared to plants experiencing heat stress for the first time (controls). Despite the three species showing a similar tolerance to a single heat stress event, stress recurrence had a different impact on each species. Lemon balm was the most sensitive species to stress reiteration, showing decreased relative water content upon heat stress repetition, together with enhanced levels of alpha-tocopherol and salicylic acid (SA). Some acclimation responses were observed in rosemary and sage, including improved water contents and reduced jasmonic acid levels in rosemary, and reduced abscisic acid (ABA) and malondialdehyde (MDA) levels in sage plants previously exposed to high temperatures. Furthermore, the response of plants to a combination of heat stress and water deficit was evaluated in plants previously exposed to heat stress and compared to controls. Rosemary and sage were much more resistant than lemon balm, which died when stresses were combined. Despite stress pre-exposure not having any effect on plant performance in terms of F-v/F-m, MDA and relative water content in rosemary and sage, it resulted in higher alpha-tocopherol levels in both species. The hormonal response differed between species: while the hormonal content did not change in sage, rosemary showed increased ABA and decreased SA levels as a result of repeated stress exposure. Overall, different stress imprints particular to each species and stress scenario were found in alpha-tocopherol and hormone levels, which led to similar protective effects in rosemary and sage. (c) 2012 Elsevier B.V. All rights reserved.