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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

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

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Autor(es):
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]
Número total de Autores: 10
Afiliação do(s) autor(es):
[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
Número total de Afiliações: 10
Tipo de documento: Artigo Científico
Fonte: PLANT CELL AND ENVIRONMENT; v. 37, n. 1, p. 70-81, JAN 2014.
Citações Web of Science: 51
Resumo

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)

Processo FAPESP: 10/50663-8 - Interações entre disponibilidade hídrica e potássica na eficiência de uso dos recursos em Eucalyptus grandis
Beneficiário:Patricia Renée Françoise Battie Laclau
Linha de fomento: Bolsas no Brasil - Doutorado