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- Influence of potassium and sodium nutrition on leaf area components in Eucalyptus grandis trees
- Universidade de São Paulo (USP)
- CIRAD, UMR Eco at Sols
- Universidade Estadual Paulista (UNESP)
- Ecole Supérieure d'Agriculture d'Angers
- Université de Bordeaux, UMR 1220 TCEM
- INRA, UR Biogéochimie des Ecosystèmes Forestiers
- Background and Aims: 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. Methods: 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). Results: 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. Conclusions: 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. © 2013 Springer Science+Business Media Dordrecht.
- Plant and Soil, v. 371, n. 1-2, p. 19-35, 2013.
- Cell size
- Cell turgor
- Leaf area
- Leaf lifespan
- Leaf longevity
- Osmotic potential
- Soluble sugars
- Acesso restrito
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