Molecular oxygen as a signaling component in plant development

While traditionally hypoxia has been studied as a detrimental component of flooding stress, the last decade has flourished with studies reporting the involvement of molecular oxygen availability in plant developmental processes. Moreover, proliferating and undifferentiated cells from different plant...

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Bibliographic Details
Published in:The New phytologist 2021-01, Vol.229 (1), p.24-35
Main Authors: Weits, Daan A., van Dongen, Joost T., Licausi, Francesco
Format: Article
Language:English
Subjects:
Arabidopsis - metabolism
Arabidopsis Proteins - metabolism
Availability
Flooding
Gene Expression Regulation, Plant
Hypoxia
meristem
Meristem - metabolism
Meristems
Niches
N‐degron pathway
Oxygen
Oxygen - metabolism
Plant cells
Plant Development
plant evolution
Plant growth
Plant tissues
Proteolysis
Regulators
root
Root development
Seedlings
shoot apex
Signal transduction
Signaling
Substrates
Tansley review
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Summary:While traditionally hypoxia has been studied as a detrimental component of flooding stress, the last decade has flourished with studies reporting the involvement of molecular oxygen availability in plant developmental processes. Moreover, proliferating and undifferentiated cells from different plant tissues were found to reside in endogenously generated hypoxic niches. Thus, stress-associated acute hypoxia may be distinguished from constitutively generated chronic hypoxia. The Cys/Arg branch of the N-degron pathway assumes a central role in integrating oxygen levels resulting in proteolysis of transcriptional regulators that control different aspects of plant growth and development. As a target of this pathway, group VII of the Ethylene Response Factor (ERF-VII) family has emerged as a hub for the integration of oxygen dynamics in root development and during seedling establishment. Additionally, vegetative shoot meristem activity and reproductive transition were recently associated with oxygen availability via two novel substrates of the N-degron pathways: VERNALISATION 2 (VRN2) and LITTLE ZIPPER 2 (ZPR2). Together, these observations support roles for molecular oxygen as a signalling molecule in plant development, as well as in essential metabolic reactions. Here, we review recent findings regarding oxygen-regulated development, and discuss outstanding questions that spring from these discoveries.
ISSN:0028-646X
1469-8137
DOI:10.1111/nph.16424