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An Herbicide-Susceptible Rigid Ryegrass (Lolium rigidum) Population Made Even More Susceptible

Published online by Cambridge University Press:  20 January 2017

Sudheesh Manalil ,
Roberto Busi ,
Michael Renton  and
Stephen B. Powles
Sudheesh Manalil
Affiliation:
School of Plant Biology, The University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia Kerala Agricultural University Trissur, Kerala, India, 680 656
Roberto Busi
Affiliation:
Australian Herbicide Resistance Initiative, School of Plant Biology, Institute of Agriculture, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia
Michael Renton
Affiliation:
School of Plant Biology, University of Western Australia, 35 Sitrling Highway, Crawley 6009, Australia and Ecocsystem Sciences, CSIRO, Floreat, WA, Australia
Stephen B. Powles*
Affiliation:
Australian Herbicide Resistance Initiative, School of Plant Biology, Institute of Agriculture, University of Western Australia, 35 Stirling Highway, Crawley 6009, Australia
*
Corresponding author's E-mail: stephen.powles@uwa.edu.au
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Abstract

A wild population of a plant species, especially a cross-pollinated species, can display considerable genetic variation. Genetic variability is evident in differential susceptibility to an herbicide because the population can show continuous phenotypic variation. Recent, recurrent selection studies have revealed that phenotypic variation in response to low herbicide rates is heritable and can result in rapid evolution of herbicide resistance in genetically variable cross-pollinated rigid ryegrass. In this study, the heritable genetic variation in an herbicide-susceptible rigid ryegrass population was exploited to shift the population toward greater herbicide susceptibility by recurrent selection. To enhance herbicide susceptibility, herbicide-susceptible rigid ryegrass plants were divided into two identical clones, and one series of cloned plants was treated with a low rate of herbicide (diclofop). The nontreated clones of individuals that did not survive the herbicide treatment were selected and bulk-crossed to obtain the susceptible progeny. After two cycles of selection, the overall susceptibility to diclofop was doubled. The results indicate that minor genes for resistance are present in an herbicide-susceptible rigid ryegrass population, and their exclusion can increase susceptibility to diclofop.

Keywords

Diclofoprigid ryegrass, Lolium rigidum Gaudin. LOLRIHerbicide susceptibilityreduced herbicide rateVLR1
Type
Weed Management
Information
Weed Science , Volume 60 , Issue 1 , March 2012 , pp. 101 - 105
Copyright
Copyright © Weed Science Society of America 

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