DOI: 10.1101/479030Nov 27, 2018Paper

HNI9 and HY5 maintain ROS homeostasis under high nitrogen provision in Arabidopsis

BioRxiv : the Preprint Server for Biology
Fanny BellegardeAntoine Martin

Abstract

Reactive Oxygen Species (ROS) can accumulate in cells at excessive levels, leading to unbalanced redox status and to a potential oxidative stress, which can have damaging effects to the molecular components of plant cells. Several environmental conditions have been described as causing an elevation of ROS production in plants. Consequently, this requires the expression of detoxification responses in order to maintain ROS homeostasis at physiological levels. In case of mis-regulation of the detoxification systems, oxidative stress can lead ultimately to growth retardation and developmental defects. Here, we demonstrate that Arabidopsis plants growing under high nitrogen environment have to express a set of genes involved in detoxification of ROS in order to maintain ROS at physiological levels. We show that the chromatin factor HNI9 is an important actor of this response, required for the expression of these detoxification genes. Mutation in HNI9 leads to elevated ROS levels, and to ROS-dependent phenotypic defects under high but not low N provision. In addition, we identify HY5 as one of the major transcription factors also required for the expression of this detoxification program under high N condition. Our results demonstrat...Continue Reading

Related Concepts

Environment
Genes
Myocardial Infarction
Nitrogen
Oxidation-Reduction
Transcription Factor
Detoxification Procedure
Growth Retardation
Arabidopsis thaliana <plant>
Reactive Oxygen Species

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