The Apocarotenoid β-Cyclocitric Acid Elicits Drought Tolerance in Plants

β-Cyclocitral (β-CC) is a volatile compound deriving from 1O2 oxidation of β-carotene in plant leaves. β-CC elicits a retrograde signal, modulating 1O2-responsive genes and enhancing tolerance to photooxidative stress. Here, we show that β-CC is converted into water-soluble β-cyclocitric acid (β-CCA...

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Bibliographic Details
Published iniScience Vol. 19; pp. 461 - 473
Main Authors D'Alessandro, Stefano, Mizokami, Yusuke, Légeret, Bertrand, Havaux, Michel
Format Journal Article
LanguageEnglish
Published United States Elsevier Inc 27.09.2019
Elsevier
Subjects
Biochemistry, Molecular Biology
Biological Sciences
Life Sciences
Plant Biology
Plant Genetics
Plant Physiology
Biological Sciences
Plant Biology
Plant Physiology
Plant Genetics
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Summary:β-Cyclocitral (β-CC) is a volatile compound deriving from 1O2 oxidation of β-carotene in plant leaves. β-CC elicits a retrograde signal, modulating 1O2-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. [Display omitted] •β-Cyclocitral produced by 1O2 oxidation of β-carotene oxidizes to β-cyclocitric acid•β-Cyclocitric acid triggers a signaling cascade leading to drought tolerance•β-Cyclocitric acid is water soluble and offers perspectives in crop protection•The protective action of β-cyclocitric acid does not rely on stomatal closure Biological Sciences; Plant Biology; Plant Genetics; Plant Physiology
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ISSN:2589-0042
2589-0042
DOI:10.1016/j.isci.2019.08.003