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A phloem-localized Arabidopsis metacaspase (AtMC3) improves drought tolerance
Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB, Bellaterra, Barcelona, Spain; Department of Plant Systems Biology, Department of Plant Biotechnology and Bioinformatics, Flanders Institute for Biotechnology, Ghent University, Ghent, Belgium.
Group of Plant Vascular Development, Swiss Federal Institute of Technology (ETH) Zurich, Zurich, Switzerland.
Centre for Research in Agricultural Genomics (CRAG), CSIC-IRTA-UAB-UB, Campus UAB, Bellaterra, Barcelona, Spain.
Central Institute for Engineering, Electronics and Analytics, ZEA-3, Forschungszentrum Jülich GmbH, Jülich, Germany; Cologne Excellence Cluster Cellular Stress Response in Aging-Associated Diseases (CECAD), Department of Chemistry, University of Cologne, Medical Faculty and University Hospital, Institute of Biochemistry, Joseph-Stelzmann-Str. 26, Cologne, Germany.
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2023 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 239, p. 1281-1299Article in journal (Refereed) Published
Abstract [en]

Increasing drought phenomena pose a serious threat to agricultural productivity. Although plants have multiple ways to respond to the complexity of drought stress, the underlying mechanisms of stress sensing and signaling remain unclear. The role of the vasculature, in particular the phloem, in facilitating inter-organ communication is critical and poorly understood. Combining genetic, proteomic and physiological approaches, we investigated the role of AtMC3, a phloem-specific member of the metacaspase family, in osmotic stress responses in Arabidopsis thaliana. Analyses of the proteome in plants with altered AtMC3 levels revealed differential abundance of proteins related to osmotic stress pointing into a role of the protein in water-stress-related responses. Overexpression of AtMC3 conferred drought tolerance by enhancing the differentiation of specific vascular tissues and maintaining higher levels of vascular-mediated transportation, while plants lacking the protein showed an impaired response to drought and inability to respond effectively to the hormone abscisic acid. Overall, our data highlight the importance of AtMC3 and vascular plasticity in fine-tuning early drought responses at the whole plant level without affecting growth or yield.

Place, publisher, year, edition, pages
John Wiley & Sons, 2023. Vol. 239, p. 1281-1299
Keywords [en]
abscisic acid, Arabidopsis thaliana, drought, hypoxia, metacaspases, osmotic stress, phloem
National Category
Botany
Identifiers
URN: urn:nbn:se:umu:diva-210685DOI: 10.1111/nph.19022ISI: 001010896700001PubMedID: 37320971Scopus ID: 2-s2.0-85161826198OAI: oai:DiVA.org:umu-210685DiVA, id: diva2:1774912
Available from: 2023-06-26 Created: 2023-06-26 Last updated: 2023-09-22Bibliographically approved

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Hall, HardyTuominen, Hannele

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