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Resistance to glyphosate in Lolium rigidum

Resistance to glyphosate in Lolium rigidum Annual ryegrass (Lolium rigidum) is a widespread and important weed of Australia and populations of this weed have developed resistance to most major herbicides, including glyphosate. The possible mechanisms of resistance have been examined in one glyphosate‐resistant Lolium population. No major differences were observed between resistant and susceptible biotypes in respect of (i) the target enzyme (EPSP synthase), (ii) DAHP synthase, the first enzyme of the target (shikimate) pathway, (iii) absorption of glyphosate, or (iv) translocation. Following treatment with glyphosate, there was greater accumulation of shikimate (derived from shikimate‐3‐Pi) in susceptible than in resistant plants. In addition, the resistant population exhibited cross‐resistance to 2‐hydroxy‐3‐(1,2,4‐triazol‐1‐yl)propyl phosphonate, a herbicide which, although structurally similar to glyphosate, acts at an unrelated target site. On the basis of these observations we speculate that movement of glyphosate to its site of action in the plastid is involved in the resistance mechanism. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Pest Management Science Wiley

Resistance to glyphosate in Lolium rigidum

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References (5)

Publisher
Wiley
Copyright
"Copyright © 1999 Wiley Subscription Services, Inc., A Wiley Company"
ISSN
1526-498X
eISSN
1526-4998
DOI
10.1002/(SICI)1096-9063(199904)55:4<489::AID-PS943>3.0.CO;2-T
Publisher site
See Article on Publisher Site

Abstract

Annual ryegrass (Lolium rigidum) is a widespread and important weed of Australia and populations of this weed have developed resistance to most major herbicides, including glyphosate. The possible mechanisms of resistance have been examined in one glyphosate‐resistant Lolium population. No major differences were observed between resistant and susceptible biotypes in respect of (i) the target enzyme (EPSP synthase), (ii) DAHP synthase, the first enzyme of the target (shikimate) pathway, (iii) absorption of glyphosate, or (iv) translocation. Following treatment with glyphosate, there was greater accumulation of shikimate (derived from shikimate‐3‐Pi) in susceptible than in resistant plants. In addition, the resistant population exhibited cross‐resistance to 2‐hydroxy‐3‐(1,2,4‐triazol‐1‐yl)propyl phosphonate, a herbicide which, although structurally similar to glyphosate, acts at an unrelated target site. On the basis of these observations we speculate that movement of glyphosate to its site of action in the plastid is involved in the resistance mechanism.

Journal

Pest Management Science – Wiley

Published: Apr 1, 1999

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