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Exposure to low water potentials and seed dormancy favour the fungus in the Pyrenophora semeniperda-Bromus tectorum pathosystem

Author

Listed:
  • Heather FINCH-BOEKWEG

    (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, Department of Agriculture, United States Forest Service, Rocky Mountain Research Station, Provo, USA)

Abstract

In semi-arid regions of the United States, Pyrenophora semeniperda kills seeds of the winter annual Bromus tectorum. We report on pathosystem outcomes under manipulated water potential and temperature environments commonly observed within semi-arid environments for dormant and non-dormant seeds. We propose a range of outcomes for infected seeds. During summer, seeds remain dormant and are killed across a range of water potentials. During autumn, seeds survive by rapidly germinating or are killed if radicle emergence is delayed by intermittent hydration. In winter/spring, secondarily dormant seeds can be killed by the fungus. The only likely scenarios where seeds escape death include absence of infection (autumn, spring, or following autumn, germination) or infection in autumn when seeds germinate rapidly.

Suggested Citation

  • 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.
    • Handle: RePEc:caa:jnlpps:v:49:y:2013:i:specialissue:id:31-2013-pps
    DOI: 10.17221/31/2013-PPS
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    References listed on IDEAS

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    1. 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.
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    Cited by:

    1. Phil Stewart ALLEN & Susan E. MEYER & Julie BECKSTEAD, 2013. "Predictive model for soil seedbank outcomes in the Pyrenophora semeniperda-Bromus tectorum pathosystem," Plant Protection Science, Czech Academy of Agricultural Sciences, vol. 49(SpecialIs), pages 21-23.

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