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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Battie-Laclau, Patricia [1] ; Laclau, Jean-Paul [2, 3, 4] ; Beri, Constance [5] ; Mietton, Lauriane [6] ; Almeida Muniz, Marta R. [7] ; Arenque, Bruna Cersozimo [8] ; Piccolo, Marisa de Cassia [1] ; Jordan-Meille, Lionel [9] ; Bouillet, Jean-Pierre [2, 3] ; Nouvellon, Yann [2, 10]
Total Authors: 10
Affiliation:
[1] Univ Sao Paulo, Ctr Energia Nucl Agr, BR-13400970 Piracicaba, SP - Brazil
[2] CIRAD, UMR Eco&Sols, F-34060 Montpellier - France
[3] Univ Sao Paulo, Dept Ciencias Florestais, Escola Super Agr Luis Queiroz, BR-13418900 Piracicaba, SP - Brazil
[4] Univ Estadual Sao Paulo, BR-18610300 Botucatu, SP - Brazil
[5] Ecole Super Agr Angers, F-49007 Angers 01 - France
[6] AgroParisTech, F-75231 Paris 05 - France
[7] Univ Sao Paulo, Dept Ciencias Biol, Escola Super Agr Luis Queiroz, BR-13418900 Piracicaba, SP - Brazil
[8] Univ Sao Paulo, Dept Ecol, BR-05508900 Sao Paulo - Brazil
[9] Univ Bordeaux, UMR TCEM 1220, F-33140 Villenave Dornon - France
[10] Univ Sao Paulo, IAG, Dept Ciencias Atmosfer, BR-05508900 Sao Paulo - Brazil
Total Affiliations: 10
Document type: Journal article
Source: PLANT CELL AND ENVIRONMENT; v. 37, n. 1, p. 70-81, JAN 2014.
Web of Science Citations: 47
Abstract

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. (AU)