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Influence of potassium and sodium nutrition on leaf area components in Eucalyptus grandis trees |
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| Authors: | Patricia Battie-Laclau Jean-Paul Laclau Marisa de Cassia Piccolo Bruna Cersózimo Arenque Constance Beri Lauriane Mietton Marta R. Almeida Muniz Lionel Jordan-Meille Marcos Silveira Buckeridge Yann Nouvellon Jacques Ranger Jean-Pierre Bouillet |
| Affiliation: | 1. Universidade de S?o Paulo, CENA, 13400-970, Piracicaba, SP, Brazil 2. CIRAD, UMR Eco&Sols, 2 place Viala, 34060, Montpellier, France 3. UNESP, Natural Resources Department, Botucatu, SP, 18610-307, Brazil 4. Ecology Department, IB, Universidade de S?o Paulo, 05508-900, S?o Paulo, SP, Brazil 5. Ecole Supérieure d’Agriculture d’Angers, 49 007, Angers Cedex 01, France 6. AgroParisTech, 16 rue Claude Bernard, 75231, Paris Cedex 05, France 7. ESALQ, Biological Science Department, Universidade de S?o Paulo, 13418-900, Piracicaba, SP, Brazil 8. Université de Bordeaux, UMR 1220 TCEM, 33140, Villenave d’Ornon, France 9. Atmospheric Science Department, IAG, CEP, Universidade de S?o Paulo, 05508-900, S?o Paulo, SP, Brazil 10. INRA, UR Biogéochimie des Ecosystèmes Forestiers, 54280, Champenoux, France 11. Forest Science Department, Universidade de S?o Paulo, ESALQ, 13418-900, Piracicaba, SP, Brazil |
| Abstract: | Background and AimsRecent 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.MethodsLeaf 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).ResultsK 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.ConclusionsIntermediate 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. |
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