biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 49:455-458, 2005 | DOI: 10.1007/s10535-005-0028-3

Seasonal changes of cytokinins in upper and lower leaves of a sugar maple crown

M. A. Held1,*, P. E. Quesnelle2, R. J. N. Emery2
1 Department of Biology, University of Waterloo, Waterloo, Canada
2 Department of Biology, Trent University, Peterborough, Canada

Although it is well accepted that cytokinins (CKs) regulate processes such as leaf senescence and stomatal conductance, data on CKs in the canopy of mature trees are lacking in the literature. Here we report the first in situ sampling for determination of CKs in mature sugar maple (Acer saccharum) canopy layers. The upper canopy showed a distinct seasonal pattern in total CK content, while the lower canopy remained relatively unchanged.

Keywords: Acer saccharum; canopy layers; liquid chromatography-tandem mass spectrometry
Subjects: Acer saccharum; cytokinins; growth analysis, plant development, biomass and yield enhancement; leaf senescence; maple, sugar, cytokinins; seasonal changes, gas exchange; stomatal conductance, cytokinins; sugar maple crown, upper/lower leaves

Received: August 9, 2004; Accepted: January 27, 2005; Published: September 1, 2005  Show citation

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Held, M.A., Quesnelle, P.E., & Emery, R.J.N. (2005). Seasonal changes of cytokinins in upper and lower leaves of a sugar maple crown. Biologia plantarum, 49(3), 455-458. doi: 10.1007/s10535-005-0028-3
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