Wounding systemically activates a mitogen-activated protein kinase in forage and turf grasses.

Abstract

Forage and turf grasses are continually cut and grazed by livestock, however very little is known concerning the perception or molecular responses to wounding. Mechanical wounding rapidly activated a 46 kDa and a 44 kDa mitogen-activated protein kinase (MAPK) in six different grass species. In the model grass species Lolium temulentum, the 46 kDa MAPK was rapidly activated within 5 min of wounding both locally and systemically in an adjacent unwounded tiller. This indicates that wounding generates a rapidly propagated long-distance signal that activates a MAPK in the distal portions of the plant. This 46 kDa MAPK activity was not enhanced by the addition of the pathogen-associated signal salicylic acid (SA) to the wound site nor induced when exposed to methyl jasmonate (MJ), which is a potent inducer of the wound response in dicotyledonous plants. However, pretreatment with MJ increased the wound-induced activity of the 44 kDa MAPK over the activity in control plants.

• Authors: James E Dombrowski, Sarah R Hind, Ruth C Martin, Johannes W Stratmann
• Journal: Plant science : an international journal of experimental plant biology (Plant Sci) Vol. 180 Issue 5 Pg. 686-93 (May 2011) ISSN: 1873-2259 [Electronic] Ireland
• PMID: 21421419 (Publication Type: Journal Article, Research Support, U.S. Gov't, Non-P.H.S.)
• Copyright: Copyright © 2011. Published by Elsevier Ireland Ltd.

Chemical References

• Acetates
• Cyclopentanes
• Oxylipins
• Plant Proteins
• methyl jasmonate
• Catalase
• Mitogen-Activated Protein Kinases
• Salicylic Acid

Topics

• Acetates (metabolism)
• Catalase (metabolism)
• Cyclopentanes (metabolism)
• Gene Expression Regulation, Plant
• Genes, Plant
• MAP Kinase Signaling System
• Mitogen-Activated Protein Kinases (genetics, metabolism)
• Oxylipins (metabolism)
• Plant Leaves (physiology)
• Plant Proteins (metabolism)
• Poaceae (enzymology, genetics, metabolism)
• Salicylic Acid (metabolism)