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

Publication ,  Journal Article
de Souza Mateus, N; Oliveira Ferreira, EV; Florentino, AL; Vicente Ferraz, A; Domec, J-C; Jordan-Meille, L; Bendassolli, JA; Moraes Gonçalves, JL ...
Published in: Tree physiology
January 2022

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 (Ψw), leaf area (LA), stomatal density (SD), leaf carbon (C) and nitrogen (N) isotopic compositions (δ13C and δ15N ‰) 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 δ15N ‰ values. The +PEG significantly reduced LA, plant growth, dry matter yield, Ψw, 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 δ13C ‰ 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 δ13C ‰ and δ15N ‰ values. In conclusion, management practices should seek to optimize K-nutrition to improve WUE, photosynthesis-related parameters and plant growth under water deficit conditions.

Duke Scholars

Published In

Tree physiology

DOI

EISSN

1758-4469

ISSN

0829-318X

Publication Date

January 2022

Volume

42

Issue

1

Start / End Page

59 / 70

Related Subject Headings

  • Potassium
  • Polyethylene Glycols
  • Plant Leaves
  • Plant Biology & Botany
  • Photosynthesis
  • Osmotic Pressure
  • Nitrogen Isotopes
  • Nitrogen
  • Eucalyptus
  • Carbon
 

Citation

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de Souza Mateus, N., Oliveira Ferreira, E. V., Florentino, A. L., Vicente Ferraz, A., Domec, J.-C., Jordan-Meille, L., … Lavres, J. (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. Tree Physiology, 42(1), 59–70. https://doi.org/10.1093/treephys/tpab095
Souza Mateus, Nikolas de, Eric Victor Oliveira Ferreira, Antonio Leite Florentino, Alexandre Vicente Ferraz, Jean-Christophe Domec, Lionel Jordan-Meille, José Albertino Bendassolli, José Leonardo Moraes Gonçalves, and José Lavres. “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 42, no. 1 (January 2022): 59–70. https://doi.org/10.1093/treephys/tpab095.
de Souza Mateus N, Oliveira Ferreira EV, Florentino AL, Vicente Ferraz A, Domec J-C, Jordan-Meille L, 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 Jan;42(1):59–70.
de Souza Mateus, Nikolas, 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, vol. 42, no. 1, Jan. 2022, pp. 59–70. Epmc, doi:10.1093/treephys/tpab095.
de Souza Mateus N, Oliveira Ferreira EV, Florentino AL, Vicente Ferraz A, Domec J-C, Jordan-Meille L, Bendassolli JA, Moraes Gonçalves JL, Lavres J. 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 Jan;42(1):59–70.
Journal cover image

Published In

Tree physiology

DOI

EISSN

1758-4469

ISSN

0829-318X

Publication Date

January 2022

Volume

42

Issue

1

Start / End Page

59 / 70

Related Subject Headings

  • Potassium
  • Polyethylene Glycols
  • Plant Leaves
  • Plant Biology & Botany
  • Photosynthesis
  • Osmotic Pressure
  • Nitrogen Isotopes
  • Nitrogen
  • Eucalyptus
  • Carbon