ArticleJournal of experimental botany2025
Time-Series Elemental Imaging Reveals CAX-Dependent Redistribution Patterns for Anoxia Recovery.
Article in Journal of experimental botany, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Flooding-induced oxygen deprivation (anoxia) is a challenge to plant survival, necessitating adaptive mechanisms for recovery. This study investigates elemental redistribution during anoxia recovery using time-series elemental imaging to show changes in nutrient distribution. Focusing on the role of Cation/H⁺ Exchangers (CAXs) in Arabidopsis thaliana, we show how mutants deficient in specific CAX transporters (cax1 and the cax1-4 quadruple mutant; qKO) respond to anoxia and metal stress. Mutants had reduced lipid peroxidation and increased expression of flood-tolerance proteins during recovery. X-ray Fluorescence Microscopy (XFM) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) were used to show elemental redistribution over time. In wild-type plants (Col-0), post-anoxia elemental distribution resembled the elemental distribution of CAX mutants under normoxic conditions, suggesting CAX-mediated elemental distribution before anoxia enables faster recovery post-anoxia, rather than affecting remobilization post-anoxia. While CAX mutants had altered tolerance to excess manganese and copper, leaf metal distribution during anoxia was not altered. These findings introduce the potential utility of time-series elemental imaging to show stress response phenotypes and the importance of elemental distribution to anoxia recovery. The novelty of this work lies in resolving spatial distribution patterns in a non-static system to gain insight into mechanisms of stress resilience in plants.
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