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Journal of Plant Research

, Volume 129, Issue 6, pp 1013–1020 | Cite as

The tiny-leaved orchid Cephalanthera subaphylla obtains most of its carbon via mycoheterotrophy

  • Yuki Sakamoto
  • Yuki Ogura-Tsujita
  • Kinuko Ito
  • Kenji Suetsugu
  • Jun Yokoyama
  • Jun Yamazaki
  • Tomohisa Yukawa
  • Masayuki Maki
Regular Paper

Abstract

The evolution of mycoheterotrophy has been accompanied by extreme reductions in plant leaf size and photosynthetic capacity. Partially mycoheterotrophic plants, which obtain carbon from both photosynthesis and their mycorrhizal fungi, include species with leaves of normal size and others that are tiny-leaved. Thus, plant species may lose their leaves in a gradual process of size reduction rather than through a single step mutation. Little is known about how the degree of mycoheterotrophy changes during reductions in leaf size. We compared the degree of mycoheterotrophy among five Japanese Cephalanthera species, four with leaves of normal size (Cephalanthera falcata, Cephalanthera erecta, Cephalanthera longibracteata and Cephalanthera longifolia), one with tiny leaves (Cephalanthera subaphylla), and one albino form of C. falcata (as reference specimens for fully mycoheterotrophic plants). The levels of mycoheterotrophy were determined by stable isotope natural abundance analysis. All Cephalanthera species were relatively enriched in 13C and 15N in comparison with surrounding autotrophic plants. Cephalanthera subaphylla was strongly enriched in 13C and 15N to levels similar to the albinos. Species with leaves of normal size were significantly less enriched in 13C than C. subaphylla and the albinos. Thus, C. subaphylla was strongly mycoheterotrophic, obtaining most of its carbon from mycorrhizal fungi even though it has tiny leaves; species with leaves of normal size were partially mycoheterotrophic. Hence, during the evolutionary pathway to full mycoheterotrophy, some plant species appear to have gained strong mycoheterotrophic abilities before completely losing foliage leaves.

Keywords

Cephalanthera Leaf size Mycoheterotrophy Orchidaceae Stable isotope 

Notes

Acknowledgments

We thank T. Itagaki, T. Yamada, H. Nomura, N. Takano, Y. Waki, and T. Kimura for their advice and/or assistance in the field, and Jindai Botanical Gardens for permission to collect plants. We also thank Professor Gerhard Gebauer of the University of Bayreuth for his helpful comments on our data. This study was partly supported by a Grant-in-Aid from the Ministry of Education, Culture, Sports, Science, and Technology, Japan.

Supplementary material

10265_2016_856_MOESM1_ESM.docx (28 kb)
Supplementary material 1 (DOCX 27 kb)

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Copyright information

© The Botanical Society of Japan and Springer Japan 2016

Authors and Affiliations

  • Yuki Sakamoto
    • 1
  • Yuki Ogura-Tsujita
    • 2
  • Kinuko Ito
    • 3
  • Kenji Suetsugu
    • 4
  • Jun Yokoyama
    • 5
  • Jun Yamazaki
    • 6
  • Tomohisa Yukawa
    • 7
  • Masayuki Maki
    • 1
  1. 1.Botanical GardensTohoku UniversitySendaiJapan
  2. 2.Department of AgricultureSaga UniversitySagaJapan
  3. 3.Graduate School of Agricultural ScienceTohoku UniversitySendaiJapan
  4. 4.Department of Biology, Graduate School of ScienceKobe UniversityKobeJapan
  5. 5.Department of ScienceYamagata UniversityYamagataJapan
  6. 6.College of AgricultureTamagawa UniversityMachidaJapan
  7. 7.Tsukuba Botanical GardenNational Museum of Nature and ScienceTsukubaJapan

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