Plant Physiol. Journal of Pharmacology and Experimental Therapeutics
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Published on October 5, 2007; 10.1104/pp.107.100537

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Received May 15, 2007
Accepted September 28, 2007

Ethylene and not Embolism is required for Wound-induced Tylose Development in Stems of Grapevines (Vitis vinifera L.)

Qiang Sun , Thomas L. Rost , Michael S. Reid , and Mark A. Matthews *

Biology Department, University of Wisconsin-Stevens Point, Stevens Point, WI 54481; Department of Viticulture and Enology, University of California, Davis, CA 95616; Section of Plant Biology, University of California, Davis, CA 95616; Department of Plant Sciences, University of California, Davis, CA 95616

* Corresponding author; email: mamatthews{at}ucdavis.edu.

The pruning of actively growing grapevines (Vitis vinifera L.) resulted in xylem vessel embolisms and a stimulation of tylose formation in the vessels below the pruning wound. Pruning was also followed by a ten-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 (AVG) and/or action (STS) 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.




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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]


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