Vila-Aiub, Martin M., Neve, Paul and Powles, Stephen B.. (2009) Evidence for an ecological cost of enhanced herbicide metabolism in Lolium rigidum. Journal of Ecology, Vol.97 (No.4). pp. 772-780. ISSN 0022-0477

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Abstract

1. In some cases, evaluation of resource competitive interactions between herbicide resistant vs. susceptible weed ecotypes provides evidence for the expression of fitness costs associated with evolved herbicide-resistant gene traits. Such fitness costs impact in the ecology and evolutionary trajectory of resistant populations. 2. Neighbourhood experiments were performed to quantify competitive effects and responses between herbicide-susceptible (S) and resistant (R) Lolium rigidum individuals in which resistance is due to enhanced herbicide metabolism mediated by cytochrome P450. 3. In two-way competitive interactions between the S and R phenotypes, individuals of the S phenotype were the stronger effect competitors on both a per capita and per unit-size basis. The S phenotype also exhibited a stronger competitive response to wheat plants than did the R phenotype, displaying significantly greater (30%) above-ground biomass at the vegetative stage. When subjected to competition from wheat, R individuals produced significantly fewer reproductive tillers and allocated fewer resources to reproductive traits than individuals of the S phenotype. 4. The role of potential mechanisms underlying this resistance cost driven by traits such as plant size and tolerance to low resource availability, as well as the evolutionary implications of the results are discussed. 5. Synthesis. Evolved herbicide resistance due to enhanced-herbicide metabolism mediated by cytochrome-P450 in L. rigidum has been shown to be accompanied with an impaired ability to compete for resources. These results are consistent with the resource-based theory that predicts a negative trade-off between growth and plant defence.

Item Type:	Journal Article
Subjects:	S Agriculture > SB Plant culture
Divisions:	Faculty of Science > Life Sciences (2010- ) > Warwick HRI (2004-2010)
Library of Congress Subject Headings (LCSH):	Ryegrasses, Plants -- Effect of herbicides on, Plant resource allocation, Ryegrasses -- Defenses, Plants -- Evolution
Journal or Publication Title:	Journal of Ecology
Publisher:	Wiley-Blackwell Publishing Ltd.
ISSN:	0022-0477
Date:	5 May 2009
Volume:	Vol.97
Number:	No.4
Page Range:	pp. 772-780
Identification Number:	10.1111/j.1365-2745.2009.01511.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Open Access
Funder:	Australian Grains Research and Development Corporation (GRDC)
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URI:	http://wrap.warwick.ac.uk/id/eprint/721

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