Photosynthetic and anatomical responses of Eucalyptus grandis leaves to potassium and sodium supply in a field experiment

Battie Laclau Patricia, Laclau Jean-Paul, Beri Constance, Mietton Lauriane, Almeida Muniz Marta R., Cersózimo Arenque Bruna, De Cassia Piccolo Marisa, Jordan-Meille Lionel, Bouillet Jean-Pierre, Nouvellon Yann. 2014. Photosynthetic and anatomical responses of Eucalyptus grandis leaves to potassium and sodium supply in a field experiment. Plant, Cell and Environment, 37 (1) : 70-81.

https://doi.org/10.1111/pce.12131

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Quartile : Outlier, Sujet : PLANT SCIENCES

Résumé : Although vast areas in tropical regions have weathered soils with low potassium (K) levels, little is known about the effects of K supply on the photosynthetic physiology of trees. This study assessed the effects of K and sodium (Na) supply on the diffusional and biochemical limitations to photosynthesis in Eucalyptus grandis leaves. A field experiment comparing treatments receiving K (+K) or Na (+Na) with a control treatment (C) was set up in a K-deficient soil. The net CO2 assimilation rates were twice as high in +K and 1.6 times higher in +Na than in the C as a result of lower stomatal and mesophyll resistance to CO2 diffusion and higher photosynthetic capacity. The starch content was higher and soluble sugar was lower in +K than in C and +Na, suggesting that K starvation disturbed carbon storage and transport. The specific leaf area, leaf thickness, parenchyma thickness, stomatal size and intercellular air spaces increased in +K and +Na compared to C. Nitrogen and chlorophyll concentrations were also higher in +K and +Na than in C. These results suggest a strong relationship between the K and Na supply to E.?grandis trees and the functional and structural limitations to CO2 assimilation rates.

Mots-clés Agrovoc : Eucalyptus grandis, plantation forestière, photosynthèse, fertilisation, potassium, sodium, analyse de tissu foliaire, feuille, morphologie végétale, séquestration du carbone

Mots-clés géographiques Agrovoc : Brésil

Mots-clés complémentaires : Indice foliaire, Parcelle expérimentale

Classification Agris : K10 - Production forestière
F04 - Fertilisation
F62 - Physiologie végétale - Croissance et développement
F50 - Anatomie et morphologie des plantes

Champ stratégique Cirad : Axe 1 (2014-2018) - Agriculture écologiquement intensive

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