Influence of potassium and sodium nutrition on leaf area components in Eucalyptus grandis trees
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.
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.
KeywordsK Na Nutrient Leaf area Expansion Leaf lifespan Leaf longevity Osmotic potential Cell turgor Soluble sugars Cell size
- Barrs HD, Weatherley PE (1962) A re-examination of the relative turgidity technique for estimating water deficit in leaves. Aust J Exp Biol Sci 15:413–428Google Scholar
- Berlyn GP, Miksche JP (1976) Botanical microtechnique and cytochemistry. Iowa University Press, Ames, IowaGoogle Scholar
- Bonneau X, Boulin D, Bourgoing G, Sugarianto J (1997) Le chlorure de sodium, fertilisant idéal du cocotier en Indonésie. Plant Rech Dev 4:336–346Google Scholar
- Demidchik V, Cuin TA, Svistunenko D, Smith SJ, Miller AJ, Shabala S, Sokolik A, Yurin V (2010) Arabidopsis root K+-efflux conductance activated by hydroxyl radicals: single-channel properties, genetic basis and involvement in stress-induced cell death. J Cell Sci 123:1468–1479PubMedCrossRefGoogle Scholar
- Epron D, Laclau JP, Almeida JCR, Gonçalves JLM, Ponton S, Sette CRJR, Delgado-Rojas JS, Bouillet JP, Nouvellon Y (2012) Do changes in carbon allocation account for the growth response to potassium and sodium applications in tropical Eucalyptus plantations? Tree Physiol 31:1–13Google Scholar
- FAO (2008) Current world fertilizer trends and outlook to 2012. FAO/FO/C, Rome, p 34Google Scholar
- Maquère V (2008) Dynamics of mineral elements under a fast-growing Eucalyptus plantation in Brazil. Implication for soil sustainability. Ph.D. Thesis, Agroparitech, ParisGoogle Scholar
- Marschner H (1995) Mineral nutrition of higher plants, 2nd edn. Academic, LondonGoogle Scholar
- Nobel PS (2005) Physicochemical and environmental plant physiology, 3rd edn. Elsevier, BurlingtonGoogle Scholar
- SAS Institute (1999) SAS/STAT software and enhancement, release 6.11, CaryGoogle Scholar
- Subbarao GV, Ito O, Berry WL, Wheeler RM (2003) Sodium: a functional plant nutrient. Crit Rev Plant Sci 22:391–416Google Scholar
- Tyree MT, Jarvis PG (1982) Water in tissues and cells. In: Lange OL, Nobel PS, Osmond CB, Ziegler H (eds) Physiological plant ecology. II. Water relations and carbon assimilation, encyclopedia of plant physiology, new series, vol 12B. Springer Press, Berlin, pp 36–77Google Scholar