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

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]}

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

• Tipo de documento: Artigo Científico
• Fonte: PLANT CELL AND ENVIRONMENT; v. 37, n. 1, p. 70-81, JAN 2014.
• Citações Web of Science: 47

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 - Interacoes entre disponibilidade hidrica e potassica na eficiencia de uso dos recursos em eucalyptus grandis.
• Beneficiário: Patricia Renée Françoise Battie Laclau
• Modalidade de apoio: Bolsas no Brasil - Doutorado