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Open AccessArticle

Exogenous Isoprene Confers Physiological Benefits in a Negligible Isoprene Emitter (Acer monspessulanum L.) Under Water Deficit

1
CNRS, Aix Marseille Univ, Avignon Univ, IRD, IMBE, Marseille 13331, France
2
Platform of analytical and technological research and imaging, FR1739, CNRS, Aix-Marseille Univ, Centrale Marseille, 13003 Marseille, France
3
Department of Environmental and Biological Sciences, University of Eastern Finland, P.O. Box 1627, 70211 Kuopio, Finland
*
Author to whom correspondence should be addressed.
co-first author.
Plants 2020, 9(2), 159; https://doi.org/10.3390/plants9020159
Received: 13 December 2019 / Revised: 22 January 2020 / Accepted: 24 January 2020 / Published: 28 January 2020
(This article belongs to the Special Issue Biosynthesis and Functions of Terpenoids in Plants)
Isoprene, the main volatile released by plants, is known to protect the photosynthetic apparatus in isoprene emitters submitted to oxidative pressures caused by environmental constraints. Whether ambient isoprene contributes to protect negligible plant emitters under abiotic stress conditions is less clear, and no study has tested if ambient isoprene is beneficial during drought periods in plant species that naturally release negligible isoprene emissions. This study examines the effect of exogenous isoprene (20 ppbv) on net photosynthesis, stomatal conductance and production of H2O2 (a reactive oxygen species: ROS) in leaves of Acer monspessulanum (a negligible isoprene emitter) submitted to three watering treatments (optimal, moderate water stress and severe water stress). Results showed that A. monspessulanum exhibited a net photosynthesis increase (+30%) and a relative leaf H2O2 decrease when saplings were exposed to an enriched isoprene atmosphere compared to isoprene-free conditions under moderate water deficit. Such physiological improvement under isoprene exposure was not observed under optimal watering or severe water stress. These findings suggest that when negligible isoprene emitters are surrounded by a very high concentration of isoprene in the ambient air, some plant protection mechanism occurs under moderate water deficit probably related to protection against ROS damage eventually impeding photosynthesis drop.
Keywords: isoprene protection; water deficit; oxidative pressure; negligible terpene emitters; abiotic stress; reactive oxygen species; allelochemicals isoprene protection; water deficit; oxidative pressure; negligible terpene emitters; abiotic stress; reactive oxygen species; allelochemicals
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MDPI and ACS Style

Ormeño, E.; Viros, J.; Mévy, J.-P.; Tonetto, A.; Saunier, A.; Bousquet-Mélou, A.; Fernandez, C. Exogenous Isoprene Confers Physiological Benefits in a Negligible Isoprene Emitter (Acer monspessulanum L.) Under Water Deficit. Plants 2020, 9, 159.

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