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WHOLE PLANT AND ECOPHYSIOLOGY

Ethylene and Not Embolism Is Required for Wound-Induced Tylose Development in Stems of Grapevines^1,[C],[OA]

Biology Department, University of Wisconsin, Stevens Point, Wisconsin 54481 (Q.S.); and Department of Viticulture and Enology (M.A.M.), Section of Plant Biology (T.L.R.), and Department of Plant Sciences (M.S.R.), University of California, Davis, California 95616

The pruning of actively growing grapevines (Vitis vinifera) resulted in xylem vessel embolisms and a stimulation of tylose formation in the vessels below the pruning wound. Pruning was also followed by a 10-fold increase in the concentration of ethylene at the cut surface. When the pruning cut was made under water and maintained in water, embolisms were prevented, but there was no reduction in the formation of tyloses or the accumulation of ethylene. Treatment of the stems with inhibitors of ethylene biosynthesis (aminoethoxyvinylglycine) and/or action (silver thiosulfate) delayed and greatly reduced the formation of tyloses in xylem tissue and the size and number of those that formed in individual vessels. Our data are consistent with the hypotheses that wound ethylene production is the cause of tylose formation and that embolisms in vessels are not directly required for wound-induced tylosis in pruned grapevines. The possible role of ethylene in the formation of tyloses in response to other stresses and during development, maturation, and senescence is discussed.

The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Mark A. Matthews (mamatthews{at}ucdavis.edu).

^[C] Some figures in this article are displayed in color online but in black and white in the print edition.

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www.plantphysiol.org/cgi/doi/10.1104/pp.107.100537

^* Corresponding author; e-mail mamatthews{at}ucdavis.edu.

Received May 15, 2007; accepted September 28, 2007; published October 5, 2007.

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				Q. Sun, T. L. Rost, and M. A. Matthews Wound-induced vascular occlusions in Vitis vinifera (Vitaceae): Tyloses in summer and gels in winter1 Am. J. Botany, December 1, 2008; 95(12): 1498 - 1505. [Abstract] [Full Text] [PDF]