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Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation

Author

Listed:
  • J. Pokorný

    (Department of Crop Production, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • J. Pulkrábek

    (Department of Crop Production, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • P. Štranc

    (Department of Crop Production, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

  • D. Bečka

    (Department of Crop Production, Faculty of Agrobiology, Food and Natural Resources, Czech University of Life Sciences in Prague, Prague, Czech Republic)

Abstract

This paper evaluates the influence of genotype on the photosynthetic activity of hops in the period critical for generating yield. Results over three years from measuring the photosynthesis rate statistically show an increase in the photosynthetic activity of hop plants in the flowering stage. The average photosynthetic rates from measurements on the second date (BBA 65) in the years 2007, 2008, and 2009 increased by 17.9%, 45.6%, and 49.2%, respectively. Different photosynthesis curve trends during the final stage of ontogenesis of the plants indicate the maturity level of each hop genotype. As regards the genotypes for which photosynthesis did not reduce significantly, it may be assumed that such plants had not reached technical maturity. The results from the three-year study also show that any promising genotype, with respect to the photosynthesis rate and yield, is the result of breeding of new varieties with greater resistance to drought and high temperatures. Very good results in photosynthetic activity were reached by the new varieties exhibiting high yield and a similar chemical composition to Saaz hop and those sharing the same origins to Saaz, showing a higher content of bitter substances. In 2008 and 2009, all three new forms reached yield levels of 2.35 to 3.12 t/ha of dry hops.

Suggested Citation

  • J. Pokorný & J. Pulkrábek & P. Štranc & D. Bečka, 2011. "Photosynthetic activity of selected genotypes of hops (Humulus lupulus L.) in critical periods for yield formation," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 57(6), pages 264-270.
    • Handle: RePEc:caa:jnlpse:v:57:y:2011:i:6:id:30-2011-pse
    DOI: 10.17221/30/2011-PSE
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    References listed on IDEAS

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    1. M. Dogan & R. Tipirdamaz & Y. Demir, 2010. "Salt resistance of tomato species grown in sand culture," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 56(11), pages 499-507.
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    Cited by:

    1. Pavel PROCHÁZKA & Přemysl ŠTRANC & Kateřina PAZDERŮ & Jan VOSTŘEL & Jan ŘEHOŘ, 2018. "Use of biologically active substances in hops," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 64(12), pages 626-632.
    2. V. Hejnák & H. Hniličková & F. Hnilička, 2014. "Effect of ontogeny, heterophylly and leaf position on the gas exchange of the hop plant," Plant, Soil and Environment, Czech Academy of Agricultural Sciences, vol. 60(11), pages 525-530.

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