A New Player in Jasmonate-Mediated Stomatal Closure: The Copper Amine Oxidase β

Overview

Journal Cells

Publisher MDPI

Specialties Biochemistry
Biophysics
Cell Biology
Molecular Biology

Date 2021 Dec 24

PMID 34943906

Citations 4

Authors

Ilaria Fraudentali

Chiara Pedalino

Paraskevi Tavladoraki

Riccardo Angelini

Alessandra Cona

Affiliations

Soon will be listed here.

Abstract

Plant defence responses to adverse environmental conditions include different stress signalling, allowing plant acclimation and survival. Among these responses one of the most common, immediate, and effective is the modulation of the stomatal aperture, which integrates different transduction pathways involving hydrogen peroxide (HO), calcium (Ca), nitric oxide (NO), phytohormones and other signalling components. The () encodes an apoplastic CuAO expressed in guard cells and root protoxylem tissues which oxidizes polyamines to aminoaldehydes with the production of HO and ammonia. Here, its role in stomatal closure, signalled by the wound-associated phytohormone methyl-jasmonate (MeJA) was explored by pharmacological and genetic approaches. Obtained data show that tissue-specific expression is induced by MeJA, especially in stomata guard cells. Interestingly, two T-DNA insertional mutants are unresponsive to this hormone, showing a compromised MeJA-mediated stomatal closure compared to the wild-type (WT) plants. Coherently, mutants also show compromised HO-production in guard cells upon MeJA treatment. Furthermore, the HO scavenger -dimethylthiourea (DMTU) and the CuAO-specific inhibitor 2-bromoethylamine (2-BrEtA) both reversed the MeJA-induced stomatal closure and the HO production in WT plants. Our data suggest that is involved in the HO production implicated in MeJA-induced stomatal closure.

Citing Articles

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