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Germination responses to water potential in Bromus sterilis L. under different temperatures and light regimes

Author

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  • Veronika VALIČKOVÁ

    (Department of Agroecology and Biometeorology, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Kateřina HAMOUZOVÁ

    (Department of Agroecology and Biometeorology, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Michaela KOLÁŘOVÁ

    (Department of Agroecology and Biometeorology, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • Josef SOUKUP

Abstract

Barren brome (Bromus sterilis L.) is a troublesome weed of winter cereals in western and central Europe and its control requires an exact estimation of emergence time. The study focused on the germination response of populations from the Czech Republic to water availability at different temperatures and under different light regimes. Seeds were able to germinate even at very low water potential (Ψ) close to the wilting point, but decreasing temperatures below 25°C and exposure to light decreased the germination percentage (GP) and prolonged the time to reach 50% germination (T50). At higher temperatures of 15, 20, and 25°C, seeds germinated up to a Ψ value of-1.5 MPa; however, the GP differed between light (0-3%) and darkness (50-75%). At the highest temperature of 25°C and germination in water, T50 was less than 1 day, but a decrease in Ψ to -1.5 MPa prolonged the T50 to 5 days; however, this occurred without any significant effect of light regime. With decreasing temperature and Ψ, seeds were more sensitive to the light regime and the disproportion between T50 in light and darkness increased. At a Ψ of less than -1.0 MPa, seeds needed twice as long for germination in light than in darkness when germinating at 20°C or 15°C. The results may be of value for the development of predictive models and for identifying times when weed control may be the most effective.

Suggested Citation

  • Veronika VALIČKOVÁ & Kateřina HAMOUZOVÁ & Michaela KOLÁŘOVÁ & Josef SOUKUP, 2017. "Germination responses to water potential in Bromus sterilis L. under different temperatures and light regimes," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 63(8), pages 368-374.
    • Handle: RePEc:caa:jnlpse:v:63:y:2017:i:8:id:406-2017-pse
    DOI: 10.17221/406/2017-PSE
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    References listed on IDEAS

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    1. M. Jursík & M. Kolářová & J. Soukup & V. Žďárková, 2016. "Effects of adjuvants and carriers on propoxycarbazone and pyroxsulam efficacy on Bromus sterilis in winter wheat," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 62(10), pages 447-452.
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    Cited by:

    1. Kateřina Hamouzová & Jaromír Šuk & Soham Bhattacharya & Jakub Mikulka & Veronika Valičková & Michaela Kolářová & Josef Soukup, 2024. "The effect of various factors (light, temperature, salt, and drought) on germination of Bromus sterilis L," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 70(5), pages 287-295.
    2. repec:caa:jnlpse:v:preprint:id:21-2024-pse is not listed on IDEAS

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