This Article Full Text Full Text (PDF) All Versions of this Article: 135/1/212    most recent pp.104.038927v1 Alert me when this article is cited Alert me if a correction is posted Services Email this article to a friend Related articles in Plant Physiol. Similar articles in this journal Similar articles in Web of Science Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Web of Science (24) Citing Articles via Google Scholar Google Scholar Articles by Hellgren, J. M. Articles by Sundberg, B. Search for Related Content PubMed PubMed Citation Articles by Hellgren, J. M. Articles by Sundberg, B. Agricola Articles by Hellgren, J. M. Articles by Sundberg, B.

DEVELOPMENT AND HORMONE ACTION

Patterns of Auxin Distribution during Gravitational Induction of Reaction Wood in Poplar and Pine¹

Umea Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 901–83 Umea, Sweden

Gravistimulation of tree stems affects wood development by unilaterally inducing wood with modified properties, called reaction wood. Commonly, it also stimulates cambial growth on the reaction wood side. Numerous experiments involving applications of indole-3-acetic acid (IAA) or IAA-transport inhibitors have suggested that reaction wood is induced by a redistribution of IAA around the stem. However, in planta proof for this model is lacking. Therefore, we have mapped endogenous IAA distribution across the cambial region tissues in both aspen (Populus tremula, denoted poplar) and Scots pine (Pinus sylvestris) trees forming reaction wood, using tangential cryosectioning combined with sensitive gas chromatography-mass spectrometry analysis. Moreover, we have documented the kinetics of IAA during reaction wood induction in these species. Our analysis of endogenous IAA demonstrates that reaction wood is formed without any obvious alterations in IAA balance. This is in contrast to gravitropic responses in roots and shoots where a redistribution of IAA has been documented. It is also of interest that cambial growth on the tension wood side was stimulated without an increase in IAA. Taken together, our results suggest a role for signals other than IAA in the reaction wood response, or that the gravitational stimulus interacts with the IAA signal transduction pathway.

Article, publication date, and citation information can be found at www.plantphysiol.org/cgi/doi/10.1104/pp.104.038927.

^* Corresponding author; e-mail bjorn.sundberg{at}genfys.slu.se; fax 46–90–786–5901.

Received January 11, 2004; returned for revision February 12, 2004; accepted February 13, 2004.

Related articles in Plant Physiol.:

Peter V. Minorsky
Plant Physiol. 2004 135: 1-2. [Full Text]  

This article has been cited by other articles:

				M. Hedenstrom, S. Wiklund-Lindstrom, T. Oman, F. Lu, L. Gerber, P. Schatz, B. Sundberg, and J. Ralph Identification of Lignin and Polysaccharide Modifications in Populus Wood by Chemometric Analysis of 2D NMR Spectra from Dissolved Cell Walls Mol Plant, September 1, 2009; 2(5): 933 - 942. [Abstract] [Full Text] [PDF]

				J. Love, S. Bjorklund, J. Vahala, M. Hertzberg, J. Kangasjarvi, and B. Sundberg Ethylene is an endogenous stimulator of cell division in the cambial meristem of Populus PNAS, April 7, 2009; 106(14): 5984 - 5989. [Abstract] [Full Text] [PDF]

				G. A. Tuskan, S. DiFazio, S. Jansson, J. Bohlmann, I. Grigoriev, U. Hellsten, N. Putnam, S. Ralph, S. Rombauts, A. Salamov, et al. The genome of black cottonwood, Populus trichocarpa (Torr. & Gray). Science, September 15, 2006; 313(5793): 1596 - 1604. [Abstract] [Full Text] [PDF]