期刊
PLANT AND SOIL
卷 371, 期 1-2, 页码 19-35出版社
SPRINGER
DOI: 10.1007/s11104-013-1663-7
关键词
K; Na; Nutrient; Leaf area; Expansion; Leaf lifespan; Leaf longevity; Osmotic potential; Cell turgor; Soluble sugars; Cell size
资金
- FAPESP [2010/50663-8]
- AGREENIUM (Plantotrem project)
- USP-COFECUB [2011-25]
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.
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