Influence of potassium and sodium nutrition on leaf area components in Eucalyptus grandis trees

Autor(es):Mostrar menos -

Battie-Laclau, Patricia ^[1] ; Laclau, Jean-Paul ^{[2, 3]} ; Piccolo, Marisa de Cassia ^[1] ; Arenque, Bruna Cersozimo ^[4] ; Beri, Constance ^[5] ; Mietton, Lauriane ^[6] ; Almeida Muniz, Marta R. ^[7] ; Jordan-Meille, Lionel ^[8] ; Buckeridge, Marcos Silveira ^[4] ; Nouvellon, Yann ^{[2, 9]} ; Ranger, Jacques ^[10] ; Bouillet, Jean-Pierre ^{[2, 11]}

Afiliação do(s) autor(es):Mostrar menos -

^[1] Univ Sao Paulo, CENA, BR-13400970 Piracicaba, SP - Brazil

^[2] CIRAD, UMR Eco&Sols, F-34060 Montpellier - France

^[3] UNESP, Dept Nat Resources, BR-18610307 Botucatu, SP - Brazil

^[4] Univ Sao Paulo, Dept Ecol, IB, BR-05508900 Sao Paulo - Brazil

^[5] Ecole Super Agr Angers, F-49007 Angers 01 - France

^[6] AgroParisTech, F-75231 Paris 05 - France

^[7] Univ Sao Paulo, ESALQ, Dept Biol Sci, BR-13418900 Piracicaba, SP - Brazil

^[8] Univ Bordeaux, UMR TCEM 1220, F-33140 Villenave Dornon - France

^[9] Univ Sao Paulo, Dept Atmospher Sci, IAG, CEP, BR-05508900 Sao Paulo - Brazil

^[10] INRA, UR Biogeochim Ecosyst Forestiers, F-54280 Champenoux - France

^[11] Univ Sao Paulo, Dept Forest Sci, ESALQ, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: PLANT AND SOIL; v. 371, n. 1-2, p. 19-35, OCT 2013.
• Citações Web of Science: 26

Resumo

Recent studies showed a positive tree response to Na addition in K-depleted tropical soils. Our study aimed to gain insight into the effects of K and Na fertilizations on leaf area components for a widely planted tree species. Leaf expansion rates, as well as nutrient, polyol and soluble sugar concentrations, were measured from emergence to abscission of tagged leaves in 1-year-old Eucalyptus grandis plantations. Leaf cell size and water status parameters were compared 1 and 2 months after leaf emergence in plots with KCl application (+K), NaCl application (+Na) and control plots (C). K and Na applications enhanced tree leaf area by increasing both leaf longevity and the mean area of individual leaves. Higher cell turgor in treatments +K and +Na than in the C treatment resulting from higher concentrations of osmotica contributed to increasing both palisade cell diameters and the size of fully expanded leaves. Intermediate total tree leaf area in treatment +Na compared to treatments C and +K might result from the capacity of Na to substitute K in osmoregulatory functions, whereas it seemed unable to accomplish other important K functions that contribute to delaying leaf senescence. (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