Systemic signaling during abiotic stress combination in plants
Systemic signaling during abiotic stress combination in plants
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DOI：
10.1073/pnas.2005077117
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发表时间：
2020-06-16
影响因子：
11.1
通讯作者：
Mittler, Ron
中科院分区：
文献类型：
--
作者：
Zandalinas, Sara I.;Fichman, Yosef;Mittler, Ron
极端的环境条件，如高温、盐度和水资源减少，可能对植物生长和生产力产生破坏性影响，可能导致整个生态系统的崩溃。胁迫诱导的系统性信号传导和系统性获得性驯化在植物逆境生存中起着重要作用。最近的研究表明，在响应单一的非生物胁迫，施加到一个单一的叶子，植物安装一个全面的压力特定的系统响应，其中包括许多不同的压力特定的转录物和代谢物的积累，以及协调的压力特定的全植物气孔响应。然而，在自然界中，植物通常会受到两种或两种以上不同的非生物胁迫的组合，每种胁迫都可能引发其自身的胁迫特异性系统反应，这突出了植物生物学中的一个新的基本问题：植物是否能够整合在胁迫组合条件下同时产生的两种不同的系统信号？在这里，我们表明，植物可以整合两个不同的系统信号，同时产生的压力组合，以及植物的方式，感受到不同的压力，触发这些信号（即，在植物的相同或不同部位）在它们诱导系统活性氧（ROS）信号的速度和效率、转录组、激素和气孔反应以及植物适应性方面产生显著差异。我们的研究结果揭示了植物如何适应他们的环境和生存的组合不同的非生物胁迫。此外，他们强调了系统性ROS信号在协调不同叶片对胁迫的反应中的关键作用。
Extreme environmental conditions, such as heat, salinity, and decreased water availability, can have a devastating impact on plant growth and productivity, potentially resulting in the collapse of entire ecosystems. Stress-induced systemic signaling and systemic acquired acclimation play canonical roles in plant survival during episodes of environmental stress. Recent studies revealed that in response to a single abiotic stress, applied to a single leaf, plants mount a comprehensive stress-specific systemic response that includes the accumulation of many different stress-specific transcripts and metabolites, as well as a coordinated stress-specific whole-plant stomatal response. However, in nature plants are routinely subjected to a combination of two or more different abiotic stresses, each potentially triggering its own stress-specific systemic response, highlighting a new fundamental question in plant biology: are plants capable of integrating two different systemic signals simultaneously generated during conditions of stress combination? Here we show that plants can integrate two different systemic signals simultaneously generated during stress combination, and that the manner in which plants sense the different stresses that trigger these signals (i.e., at the same or different parts of the plant) makes a significant difference in how fast and efficient they induce systemic reactive oxygen species (ROS) signals; transcriptomic, hormonal, and stomatal responses; aswell as plant acclimation. Our results shed light on how plants acclimate to their environment and survive a combination of different abiotic stresses. In addition, they highlight a key role for systemic ROS signals in coordinating the response of different leaves to stress.