Potassium supply modulates Eucalyptus leaf water-status under PEG-induced osmotic stress: integrating leaf gas exchange, carbon and nitrogen isotopic composition and plant growth - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles Tree Physiology Year : 2022

Potassium supply modulates Eucalyptus leaf water-status under PEG-induced osmotic stress: integrating leaf gas exchange, carbon and nitrogen isotopic composition and plant growth

Abstract

The objective of this study was to quantify the effect of potassium (K) supply on osmotic adjustment and drought avoidance mechanisms of Eucalyptus seedlings growing under short-term water stress. The effects of K supply on plant growth, nutritional status, leaf gas exchange parameters, leaf water potential (Psi(w)), leaf area (LA), stomatal density (SD), leaf carbon (C) and nitrogen (N) isotopic compositions (delta C-13 and delta N-15 parts per thousand) and leaf C/N ratio under polyethylene glycol (PEG)-induced water deficit were measured. Under both control (non-PEG) and osmotic stress (+PEG) conditions, K supply increased plant growth, boosting dry matter yield with decreased C/N leaf ratio and delta N-15 parts per thousand values. The +PEG significantly reduced LA, plant growth, dry matter yield, Psi(w), number of stomata per plant and leaf gas exchange, relative to non-PEG condition. Potassium supply alleviated osmotic-induced alterations in Eucalyptus seedlings by better regulating leaf development as well as SD, thus improving the rate of leaf gas exchange parameters, mesophyll conductance to CO2 (lower delta C-13 parts per thousand values) and water use efficiency (WUE). Consequently, K-supplied plants under drought better acclimated to osmotic stress than K-deficient plants, which in turn induced lower CO2 assimilation and dry matter yield, as well as higher leaf delta C-13 parts per thousand and delta N-15 parts per thousand values. In conclusion, management practices should seek to optimize K-nutrition to improve WUE, photosynthesis-related parameters and plant growth under water deficit conditions.
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hal-03562514 , version 1 (09-02-2022)

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Nikolas de Souza Mateus, Eric Victor Oliveira Ferreira, Antonio Leite Florentino, Alexandre Vicente Ferraz, Jean-Christophe Domec, et al.. Potassium supply modulates Eucalyptus leaf water-status under PEG-induced osmotic stress: integrating leaf gas exchange, carbon and nitrogen isotopic composition and plant growth. Tree Physiology, 2022, 42 (1), pp.59 - 70. ⟨10.1093/treephys/tpab095⟩. ⟨hal-03562514⟩
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