Ethylene and not embolism is required for wound-induced tylose development in stems of grapevines.

Abstract

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.

• Authors: Qiang Sun, Thomas L Rost, Michael S Reid, Mark A Matthews
• Journal: Plant physiology (Plant Physiol) Vol. 145 Issue 4 Pg. 1629-36 (Dec 2007) ISSN: 0032-0889 [Print] United States
• PMID: 17921344 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, Non-P.H.S.)

Chemical References

• Ethylenes
• Thiosulfates
• silver thiosulfate
• ethylene
• aminoethoxyvinylglycine
• Glycine

Topics

• Air
• Ethylenes (antagonists & inhibitors, metabolism)
• Glycine (analogs & derivatives, pharmacology)
• Plant Stems (drug effects, growth & development, metabolism)
• Thiosulfates (pharmacology)
• Vitis (drug effects, growth & development, metabolism)
• Xylem (drug effects, growth & development)