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Photosynthetica

, Volume 43, Issue 1, pp 55–64 | Cite as

Photosynthetic performance of vegetative and reproductive structures of green hellebore (Helleborus viridis L. agg.)

  • G. Aschan
  • H. Pfanz
  • D. Vodnik
  • F. Batič
Article

Abstract

Photosynthetic irradiance response of vegetative and reproductive structures of the green-flowered deciduous perennial green hellebore was studied by the comparative use of chlorophyll (Chl) fluorescence techniques and gas exchange measurements. All the Chl-containing organs (leaves, sepals, stalks, and fruits) examined were photosynthetically active showing high intrinsic efficiencies of photosystem 2 (Fv/Fm: 0.75–0.79) after dark adaptation. Even in the smaller fertile and sterile parts of the flower (nectaries and anthers) a remarkable photosynthetic competence was detected. With increasing photon flux densities (PFD) electron transport rates, actual quantum yields, and photochemical quenching coefficients of the main photosynthetic organs decreased in the order: leaf>sepal>fruit>stalk. At moderate to high PFDs the sepals achieved maximum electron transport rates corresponding to about 80 % of concomitant mature leaves. In contrast, maximum net photosynthetic rate of the sepals [2.3 μmol(CO2) m−2 s−1] were less than one fourth of the leaves [10.6 μmol(CO2) m−2 s−1]. This difference is explained by a 70–80 % lower stomatal density of sepals in comparison to leaves. As the basal leaves emerge late during fruit development, the photosynthetically active sepals are a major source of assimilates, contributing more than 60 % of whole-plant CO2 gain in early spring. The ripening dehiscent fruits are characterized by an effective internal re-fixation of the respirational carbon loss and thus additionally improve the overall carbon budget.

Additional key words

carbon budget chlorophyll fluorescence CO2 re-fixation floral photosynthesis nectaries sepals 

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Copyright information

© Kluwer Academic Publishers 2005

Authors and Affiliations

  • G. Aschan
    • 1
  • H. Pfanz
    • 1
  • D. Vodnik
    • 2
  • F. Batič
    • 2
  1. 1.Applied BotanyUniversity of Duisburg-EssenEssenGermany
  2. 2.Agronomy Department, Biotechnical FacultyUniversity of LjubljanaLjubljanaSlovenia

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