Mira Mohamed M, El-Khateeb Eman A, SayedAhmed Hannan I, Hill Robert D, Stasolla Claudio
a Department of Botany , Faculty of Science, Tanta University , Tanta , Egypt.
b Department of Plant Science , University of Manitoba , Winnipeg , Manitoba , Canada.
Plant Signal Behav. 2017 Jan 2;12(1):e1273304. doi: 10.1080/15592324.2016.1273304.
Plants respond to hypoxic stress through either acclimation to the stress or avoidance of it, as they do to most environmental stresses. The hypothesis that has general consensus among the community is that ethylene response factors (ERFs) are central elements that control both types of responses to hypoxia. Recent studies suggest that this may not be the case for all cells experiencing hypoxic stress. Mature maize root cells undergoing hypoxic stress were found to undergo acclimation and avoidance mechanisms involving ERFs, whereas meristematic root cells and cells still undergoing differentiation acclimated to the response without the involvement of ethylene synthesis or ERFs. Phytoglobins (PGBs) and NO were demonstrated to be components critical to the acclimation response. These findings are discussed relative to the possibility that PGBs may be acting as molecular switches controlling cellular stress responses and hormonal changes and responses in cells.
植物对缺氧胁迫的反应，与它们对大多数环境胁迫的反应一样，要么是适应胁迫，要么是避免胁迫。目前该领域已达成普遍共识的假说是，乙烯反应因子（ERF）是控制这两种缺氧反应的核心要素。然而，最近的研究表明，对于所有经历缺氧胁迫的细胞而言，情况可能并非如此。研究发现，经历缺氧胁迫的成熟玉米根细胞会通过涉及ERF的机制进行适应和规避，而分生组织根细胞和仍在分化的细胞则在不涉及乙烯合成或ERF的情况下适应这种反应。植物珠蛋白（PGB）和一氧化氮（NO）被证明是适应反应的关键组成部分。文中将结合PGB可能作为控制细胞应激反应以及细胞内激素变化和反应的分子开关这一可能性，对这些发现展开讨论。
