Oecologia

, Volume 175, Issue 3, pp 875–885 | Cite as

Nutritional regulation in mixotrophic plants: new insights from Limodorum abortivum

  • Alessandro Bellino
  • Anna Alfani
  • Marc-André Selosse
  • Rossella Guerrieri
  • Marco Borghetti
  • Daniela Baldantoni
Plant-microbe-animal interactions - Original research

Abstract

Partially mycoheterotrophic (mixotrophic) plants gain carbon from both photosynthesis and their mycorrhizal fungi. This is considered an ancestral state in the evolution of full mycoheterotrophy, but little is known about this nutrition, and especially about the physiological balance between photosynthesis and fungal C gain. To investigate possible compensation between photosynthesis and mycoheterotrophy in the Mediterranean mixotrophic orchid Limodorum abortivum, fungal colonization was experimentally reduced in situ by fungicide treatment. We measured photosynthetic pigments of leaves, stems, and ovaries, as well as the stable C isotope compositions (a proxy for photosynthetic C gain) of seeds and the sizes of ovaries and seeds. We demonstrate that (1) in natural conditions, photosynthetic pigments are most concentrated in ovaries; (2) pigments and photosynthetic C increase in ovaries when fungal C supply is impaired, buffering C limitations and allowing the same development of ovaries and seeds as in natural conditions; and (3) responses to light of pigment and 13C contents in ovaries shift from null responses in natural conditions to responses typical of autotrophic plants in treated L. abortivum, demonstrating photoadaptation and enhanced use of light in the latter. L. abortivum thus preferentially feeds on fungi in natural conditions, but employs compensatory photosynthesis to buffer fungal C limitations and allow seed development.

Keywords

Mycoheterotrophy Evolution Photosynthetic pigments δ13Orchids 

Supplementary material

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Alessandro Bellino
    • 1
  • Anna Alfani
    • 1
  • Marc-André Selosse
    • 2
  • Rossella Guerrieri
    • 3
    • 4
  • Marco Borghetti
    • 3
  • Daniela Baldantoni
    • 1
  1. 1.Dipartimento di Chimica e BiologiaUniversità degli Studi di SalernoFiscianoItaly
  2. 2.Département Systématique et Evolution (UMR 7205 OSEB)Muséum national d’Histoire naturelleParisFrance
  3. 3.Dipartimento di Scienze dei Sistemi Colturali, Forestali e dell’AmbienteUniversità della BasilicataPotenzaItaly
  4. 4.Earth Systems Research CenterUniversity of New HampshireDurhamUSA

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