title: Are avoidance and acclimation responses during hypoxic stress modulated by distinct cell-specific mechanisms?
abstract: 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.
authors.affiliation: a Department of Botany , Faculty of Science, Tanta University , Tanta , Egypt.
authors.forename: Mohamed M
authors.initials: MM
authors.lastname: Mira
authors.affiliation: a Department of Botany , Faculty of Science, Tanta University , Tanta , Egypt.
authors.forename: Eman A
authors.initials: EA
authors.lastname: El-Khateeb
authors.affiliation: a Department of Botany , Faculty of Science, Tanta University , Tanta , Egypt.
authors.forename: Hannan I
authors.initials: HI
authors.lastname: SayedAhmed
authors.affiliation: b Department of Plant Science , University of Manitoba , Winnipeg , Manitoba , Canada.
authors.forename: Robert D
authors.initials: RD
authors.lastname: Hill
authors.affiliation: b Department of Plant Science , University of Manitoba , Winnipeg , Manitoba , Canada.
authors.forename: Claudio
authors.initials: C
authors.lastname: Stasolla
mesh_terms: D029681:Arabidopsis Proteins / Q000235:genetics / Q000378:metabolism; D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology; D009569:Nitric Oxide / Q000378:metabolism; D010937:Plant Growth Regulators / Q000235:genetics / Q000378:metabolism; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism; D018517:Plant Roots / Q000235:genetics / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology; D003313:Zea mays / Q000235:genetics / Q000378:metabolism*
chemical_list: D029681:Arabidopsis Proteins; C095706:ERS protein, Arabidopsis; D010937:Plant Growth Regulators; D010940:Plant Proteins; D017382:Reactive Oxygen Species; D009569:Nitric Oxide
keywords: Ethylene response factors; MYC2; NO; PCD; ROS; hypoxia; phytoglobin