, Volume 40, Issue 4, pp 575–579 | Cite as

Photosynthesis of Cockspur [Echinochloa crus-galli (L.) Beauv.] at Sites of Naturally Elevated CO2 Concentration

  • D. Vodnik
  • H. Pfanz
  • I. Maček
  • D. Kastelec
  • S. Lojen
  • F. Batič


High abundance of cockspur (Echinochloa crus-galli) at the geothermal carbon dioxide spring area in Stavešinci indicates that this species is able to grow under widely varying CO2 concentrations. Living cockspur plants can even be found very close to gas-releasing vents where growth is significantly reduced. Plant height correlated well with CO2 exposure. The δ13C value of the CO2 spring air was −3.9 ‰ and δ13C values of high-, medium-, and low-CO2 plants were −10.14, −10.44, and −11.95 ‰, respectively. Stomatal response directly followed the prevailing CO2 concentrations, with the highest reduction of stomatal conductance in high CO2 concentration grown plants. Analysis of the curves relating net photosynthetic rate to intercellular CO2 concentration (PN-Ci curves) revealed higher CO2 compensation concentration in plants growing at higher CO2 concentration. This indicates adjustment of respiration and photosynthetic carbon assimilation according to the prevailing CO2 concentrations during germination and growth. There was no difference in other photosynthetic parameters measured.

carbon dioxide springs chlorophyll CO2 compensation concentration intercellular CO2 concentration net photosynthetic rate plant height stomatal conductance δ13


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Copyright information

© Kluwer Academic Publishers 2002

Authors and Affiliations

  • D. Vodnik
    • 1
  • H. Pfanz
    • 2
  • I. Maček
    • 1
  • D. Kastelec
    • 1
  • S. Lojen
    • 3
  • F. Batič
    • 1
  1. 1.Agronomy Department, Biotechnical FacultyUniversity of Ljubljana, Jamnikarjeva 101LjubljanaSlovenia
  2. 2.Institute for Applied BotanyUniversity of EssenEssenGermany
  3. 3.Jožef Stefan Institute, Jamova 39LjubljanaSlovenia

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