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Germination, Growth, and Development of Herbicide Resistant and Susceptible Populations of Rigid Ryegrass (Lolium rigidum)

Published online by Cambridge University Press:  12 June 2017

Gurjeet S. Gill ,
Roger D. Cousens  and
Margaret R. Allan
Gurjeet S. Gill
Affiliation:
Weed Sci., Dep. of Agric., Baron-Hay Court, South Perth, WA 6151, Australia
Roger D. Cousens
Affiliation:
Weed Sci., Dep. of Agric., Baron-Hay Court, South Perth, WA 6151, Australia
Margaret R. Allan
Affiliation:
Weed Sci., Dep. of Agric., Baron-Hay Court, South Perth, WA 6151, Australia
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Abstract

Rate of seedling emergence, relative growth rate (RGR), and phenological development were compared in several accessions of rigid ryegrass belonging to three distinct resistance classes. The aryloxyphenoxypropionate resistant (AOPP-R) class had a faster and less variable seedling emergence than the sulfonylurea resistant (SU-R) and susceptible (S) classes. However, even the fastest of the AOPP-R accessions was within the range of the S and SU-R classes. No significant differences were detected among the resistant classes in seed dormancy, RGR, and the rate of phenological development. The rate of spike emergence, irrespective of the resistance class, was related to the latitude of the origin of the accessions, suggesting adaptation to the local climates since introduction. Due to considerable variation among weed populations for most biological attributes, the need to include several R and S accessions, in studies similar to the one reported here, is of vital importance. Because of the means and variances of the three resistance classes, at least four accessions from each resistance class would have been required to detect the observed differences between emergence rates of the AOPP-R and S classes with a confidence of 95%.

Keywords

AOPP, aryloxyphenoxypropionateSU, sulfonylureasusceptibleresistantrigid ryegrass, Lolium rigidum Gaud. ♯ LOLRIAOPP-resistanceSU-resistanceemergence raterelative growth ratephenologyLOLRI
Type
Weed Biology and Ecology
Information
Weed Science , Volume 44 , Issue 2 , June 1996 , pp. 252 - 256
Copyright
Copyright © 1996 by the Weed Science Society of America 

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