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The Apocarotenoid ?-Cyclocitric Acid Elicits Drought Tolerance in Plants.

ABSTRACT: ?-Cyclocitral (?-CC) is a volatile compound deriving from 1O2 oxidation of ?-carotene in plant leaves. ?-CC elicits a retrograde signal, modulating 1O2-responsive genes and enhancing tolerance to photooxidative stress. Here, we show that ?-CC is converted into water-soluble ?-cyclocitric acid (?-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 ?-CCA is a conserved mechanism, being observed in various plant species, and it does not fully overlap with the ?-CC-dependent signaling, indicating that ?-CCA induces only a branch of ?-CC signaling. Overexpressing SCARECROW-LIKE14 (SCL14, a regulator of xenobiotic detoxification) increased drought tolerance and potentiated the protective effect of ?-CCA, showing the involvement of the SCL14-dependent detoxification in the phenomenon. ?-CCA is a bioactive apocarotenoid that could potentially be used to protect crop plants against drought.

SUBMITTER: D'Alessandro S 

PROVIDER: S-EPMC6710299 | biostudies-literature | 2019 Sep

REPOSITORIES: biostudies-literature

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The Apocarotenoid β-Cyclocitric Acid Elicits Drought Tolerance in Plants.

D'Alessandro Stefano S   Mizokami Yusuke Y   Légeret Bertrand B   Havaux Michel M  

iScience 20190806

β-Cyclocitral (β-CC) is a volatile compound deriving from <sup>1</sup>O<sub>2</sub> oxidation of β-carotene in plant leaves. β-CC elicits a retrograde signal, modulating <sup>1</sup>O<sub>2</sub>-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, os  ...[more]

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