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The Apocarotenoid β-Cyclocitric Acid Elicits Drought Tolerance in Plants

Stefano d'Alessandro 1 yusuke Mizokami 2 Bertrand Legeret 3 Michel Havaux 1, 4, * 
* Corresponding author
2 P&E - Photosynthèse & Environnement
BIAM - Institut de Biosciences et Biotechnologies d'Aix-Marseille (ex-IBEB) : DRF/BIAM
3 EBM - Bioénergie et Microalgues
BIAM - Institut de Biosciences et Biotechnologies d'Aix-Marseille (ex-IBEB) : DRF/BIAM
4 SAVE - Signalisation de l'Adaptation des Végétaux à l'Environnement
BIAM - Institut de Biosciences et Biotechnologies d'Aix-Marseille (ex-IBEB) : DRF/BIAM
Abstract : β-Cyclocitral (β-CC) is a volatile compound deriving from 1O21O2^1O_2 oxidation of β-carotene in plant leaves. β-CC elicits a retrograde signal, modulating 1O21O2^1O_2-responsive genes and enhancing tolerance to photooxidative stress. Here, we show that β-CC is converted into water-soluble β-cyclocitric acid (β-CCA) in leaves. This metabolite is a signal that enhances plant tolerance to drought by a mechanism different from known responses such as stomatal closure, osmotic potential adjustment, and jasmonate signaling. This action of β-CCA is a conserved mechanism, being observed in various plant species, and it does not fully overlap with the β-CC-dependent signaling, indicating that β-CCA induces only a branch of β-CC signaling. Overexpressing SCARECROW-LIKE14 (SCL14, a regulator of xenobiotic detoxification) increased drought tolerance and potentiated the protective effect of β-CCA, showing the involvement of the SCL14-dependent detoxification in the phenomenon. β-CCA is a bioactive apocarotenoid that could potentially be used to protect crop plants against drought.
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Submitted on : Tuesday, August 27, 2019 - 2:29:20 PM
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Stefano d'Alessandro, yusuke Mizokami, Bertrand Legeret, Michel Havaux. The Apocarotenoid β-Cyclocitric Acid Elicits Drought Tolerance in Plants. iScience, Elsevier, 2019, 19, pp.461-473. ⟨10.1016/j.isci.2019.08.003⟩. ⟨cea-02272035⟩

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