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Pollen-mediated gene flow between paraquat-resistant and susceptible hare barley (Hordeum leporinum)

Published online by Cambridge University Press:  20 January 2017

Imam Hidayat ,
Jeanine Baker  and
Christopher Preston
Imam Hidayat
Affiliation:
School of Agriculture and Wine, Faculty of Sciences, University of Adelaide, PMB 1, Glen Osmond, SA 5064, Australia
Jeanine Baker
Affiliation:
Cooperative Research Centre for Australian Weed Management and School of Agriculture and Wine, Waite Campus, Adelaide University, PMB 1, Glen Osmond SA 5064, Australia
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Abstract

Pollen movement between individuals can increase the rate of herbicide resistance evolution by spreading resistance alleles within or between populations and by facilitating the rapid accumulation of resistance alleles within individuals. This study investigated the level of pollen-mediated gene flow between paraquat-resistant and paraquat-susceptible populations of the self-pollinated weed species hare barley. The experiment was conducted in both directions, from resistant to susceptible and susceptible to resistant, across 2 yr. To maximize the potential for pollen flow, individual plants were grown in a single pot. The level of gene flow was similar across years and between genotypes. The level of pollen-mediated gene flow ranged from 0.06 to 0.15%. Gene flow from resistant to susceptible plants was confirmed by demonstrating segregation for resistance in the progeny of suspected crosses. This study suggests that pollen-mediated gene flow will occur in this species at frequencies less than 0.16% and could assist the accumulation of resistance alleles within a population. These low levels of gene flow through pollen movement suggest that cross-pollination over larger distances would be unlikely and pollen movement probably does not contribute to gene flow between populations.

Keywords

Paraquathare barley, Hordeum leporinum Link. HORLEGene flowHordeum leporinumresistance evolutionpollen
Type
Research Article
Information
Weed Science , Volume 54 , Issue 4 , August 2006 , pp. 685 - 689
Copyright
Copyright © Weed Science Society of America 

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