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Secondary dormancy of seeds in relation to the Bromus tectorum-Pyrenophora semeniperda pathosystem

Author

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  • Katie Karen HAWKINS

    (Department of Plant and Wildlife Sciences, Brigham Young University, Provo, USA)

  • Phil ALLEN

    (Department of Plant and Wildlife Sciences, Brigham Young University, Provo, USA)

  • Susan MEYER

    (Shrub Sciences Laboratory, Provo, USA)

Abstract

Bromus tectorum is a highly invasive annual grass. The fungal pathogen Pyrenophora semeniperda can kill a large fraction of B. tectorum seeds. Outcomes in this pathosystem are often determined by the speed of seed germination. In this paper we extend previous efforts to describe the pathosystem by characterising secondary dormancy acquisition of B. tectorum. In the laboratory approximately 80% of seeds incubated at -1.0 MPa became dormant. In the field, seeds were placed in the seed bank in late autumn, retrieved monthly and dormancy status determined. The field study confirmed the laboratory results; ungerminated seeds became increasingly dormant. Our data suggest that secondary dormancy is much more likely to occur at xeric sites.

Suggested Citation

  • Katie Karen HAWKINS & Phil ALLEN & Susan MEYER, 2013. "Secondary dormancy of seeds in relation to the Bromus tectorum-Pyrenophora semeniperda pathosystem," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 49(SpecialIs), pages 11-14.
    • Handle: RePEc:caa:jnlpps:v:49:y:2013:i:specialissue:id:30-2013-pps
    DOI: 10.17221/30/2013-PPS
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    Cited by:

    1. Heather FINCH-BOEKWEG & Phil ALLEN & Susan MEYER, 2013. "Exposure to low water potentials and seed dormancy favour the fungus in the Pyrenophora semeniperda-Bromus tectorum pathosystem," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 49(SpecialIs), pages 15-21.

    More about this item

    Keywords

    biological control; invasive annual grass;

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