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The Chromatin Factor HNI9 and ELONGATED HYPOCOTYL5 Maintain ROS Homeostasis under High Nitrogen Provision.
- Source :
-
Plant physiology [Plant Physiol] 2019 May; Vol. 180 (1), pp. 582-592. Date of Electronic Publication: 2019 Mar 01. - Publication Year :
- 2019
-
Abstract
- Reactive oxygen species (ROS) can accumulate in cells at excessive levels, leading to unbalanced redox states and to potential oxidative stress, which can have damaging effects on the molecular components of plant cells. Several environmental conditions have been described as causing an elevation of ROS production in plants. Consequently, activation of detoxification responses is necessary to maintain ROS homeostasis at physiological levels. Misregulation of detoxification systems during oxidative stress can ultimately cause growth retardation and developmental defects. Here, we demonstrate that Arabidopsis ( Arabidopsis thaliana ) plants grown in a high nitrogen (N) environment express a set of genes involved in detoxification of ROS that maintain ROS at physiological levels. We show that the chromatin factor HIGH NITROGEN INSENSITIVE9 (HNI9) is an important mediator of this response and is required for the expression of detoxification genes. Mutation in HNI9 leads to elevated ROS levels and ROS-dependent phenotypic defects under high but not low N provision. In addition, we identify ELONGATED HYPOCOTYL5 as a major transcription factor required for activation of the detoxification program under high N. Our results demonstrate the requirement of a balance between N metabolism and ROS production, and our work establishes major regulators required to control ROS homeostasis under conditions of excess N.<br /> (© 2019 American Society of Plant Biologists. All Rights Reserved.)
- Subjects :
- Arabidopsis Proteins genetics
Basic-Leucine Zipper Transcription Factors genetics
Gene Expression Regulation, Plant
Histones metabolism
Homeostasis
Mutation
Plants, Genetically Modified
Transcription Factors genetics
Arabidopsis physiology
Arabidopsis Proteins metabolism
Basic-Leucine Zipper Transcription Factors metabolism
Nitrogen metabolism
Reactive Oxygen Species metabolism
Transcription Factors metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1532-2548
- Volume :
- 180
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Plant physiology
- Publication Type :
- Academic Journal
- Accession number :
- 30824566
- Full Text :
- https://doi.org/10.1104/pp.18.01473