Universität zu Köln

von der Mark, Claudia ORCID: 0000-0003-4338-5265, Ivanov, Rumen ORCID: 0000-0001-7909-4123, Eutebach, Monique, Maurino, Veronica G., Bauer, Petra and Brumbarova, Tzvetina ORCID: 0000-0002-3104-6795 (2021). Reactive oxygen species coordinate the transcriptional responses to iron availability in Arabidopsis. J. Exp. Bot., 72 (6). S. 2181 - 2196. OXFORD: OXFORD UNIV PRESS. ISSN 1460-2431

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Abstract

Reactive oxygen species play a central role in the regulation of plant responses to environmental stress. Under prolonged iron (Fe) deficiency, increased levels of hydrogen peroxide (H2O2) initiate signaling events, resulting in the attenuation of Fe acquisition through the inhibition of FER-LIKE IRON DEFICIENCY-INDUCED TRANSCRIPTION FACTOR (FIT). As this H2O2 increase occurs in a FIT-dependent manner, our aim was to understand the processes involved in maintaining H2O2 levels under prolonged Fe deficiency and the role of FIT. We identified the CAT2 gene, encoding one of the three Arabidopsis catalase isoforms, as regulated by FIT. CAT2 loss-of-function plants displayed severe susceptibility to Fe deficiency and greatly increased H2O2 levels in roots. Analysis of the Fe homeostasis transcription cascade revealed that H2O2 influences the gene expression of downstream regulators FIT, BHLH genes of group Ib, and POPEYE (PYE); however, H2O2 did not affect their upstream regulators, such as BHLH104 and ILR3. Our data shows that FIT and CAT2 participate in a regulatory loop between H2O2 and prolonged Fe deficiency.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code von der Mark, Claudia UNSPECIFIED orcid.org/0000-0003-4338-5265 UNSPECIFIED Ivanov, Rumen UNSPECIFIED orcid.org/0000-0001-7909-4123 UNSPECIFIED Eutebach, Monique UNSPECIFIED UNSPECIFIED UNSPECIFIED Maurino, Veronica G. UNSPECIFIED UNSPECIFIED UNSPECIFIED Bauer, Petra UNSPECIFIED UNSPECIFIED UNSPECIFIED Brumbarova, Tzvetina UNSPECIFIED orcid.org/0000-0002-3104-6795 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-583445
DOI:	10.1093/jxb/eraa522
Journal or Publication Title:	J. Exp. Bot.
Volume:	72
Number:	6
Page Range:	S. 2181 - 2196
Date:	2021
Publisher:	OXFORD UNIV PRESS
Place of Publication:	OXFORD
ISSN:	1460-2431
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language OXIDATIVE STRESS; DEFICIENCY RESPONSES; S-NITROSYLATION; GENE-EXPRESSION; ROOT-SYSTEM; FACTOR FIT; HOMEOSTASIS; INTERACTS; ROS; TOLERANCE Multiple languages Plant Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/58344