Impact of transgene genome location on gene migration from herbicide‐resistant wheat (Triticum aestivum L.) to jointed goatgrass (Aegilops cylindrica Host)

BACKGROUND Wheat (Triticum aestivum) (ABD) and jointed goatgrass (Aegilops cylindrica) (CD) can cross and produce hybrids that can backcross to either parent. Such backcrosses can result in progeny with chromosomes and/or chromosome segments retained from wheat. Thus, a herbicide resistance gene cou...

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Bibliographic Details
Published in:Pest management science 2017-08, Vol.73 (8), p.1593-1597
Main Authors: Rehman, Maqsood, Hansen, Jennifer L, Mallory‐Smith, Carol A, Zemetra, Robert S
Format: Article
Language:English
Subjects:
Chromosomes
Chromosomes, Plant - genetics
Disease transmission
Disjunction
gene flow
Genes, Plant - genetics
Genetic crosses
Genomes
glyphosate resistance
Goat grass
Herbicide resistance
Herbicide Resistance - genetics
Herbicides
Hybridization, Genetic
Hybrids
jointed goatgrass
Meiosis
Migration
Poaceae - genetics
Populations
Progeny
Retention
Transgenes
Transgenes - genetics
Triticum - genetics
Triticum - physiology
Triticum aestivum
Wheat
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Summary:BACKGROUND Wheat (Triticum aestivum) (ABD) and jointed goatgrass (Aegilops cylindrica) (CD) can cross and produce hybrids that can backcross to either parent. Such backcrosses can result in progeny with chromosomes and/or chromosome segments retained from wheat. Thus, a herbicide resistance gene could migrate from wheat to jointed goatgrass. In theory, the risk of gene migration from herbicide‐resistant wheat to jointed goatgrass is more likely if the gene is located on the D genome and less likely if the gene is located on the A or B genome of wheat. RESULTS BC1 populations (jointed goatgrass as a recurrent parent) were analyzed for chromosome numbers and transgene transmission rates under sprayed and non‐sprayed conditions. Transgene retention in the non‐sprayed BC1 generation for the A, B and D genomes was 84, 60 and 64% respectively. In the sprayed populations, the retention was 81, 59 and 74% respectively. CONCLUSION The gene transmission rates were higher than the expected 50% or less under sprayed and non‐sprayed conditions, possibly owing to meiotic chromosome restitution and/or chromosome non‐disjunction. Such high transmission rates in the BC1 generation negates the benefits of gene placement for reducing the potential of gene migration from wheat to jointed goatgrass. © 2016 Society of Chemical Industry
ISSN:1526-498X
1526-4998
DOI:10.1002/ps.4490