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The giant mycoheterotrophic orchid Erythrorchis altissima is associated mainly with a divergent set of wood-decaying fungi

Title data

Ogura-Tsujita, Yuki ; Gebauer, Gerhard ; Xu, Hui ; Fukasawa, Yu ; Umata, Hidetaka ; Tetsuka, Kenshi ; Kubota, Miho ; Schweiger, Julienne ; Yamashita, Satoshi ; Maekawa, Nitaro ; Maki, Masayuki ; Isshiki, Shiro ; Yukawa, Tomohisa:
The giant mycoheterotrophic orchid Erythrorchis altissima is associated mainly with a divergent set of wood-decaying fungi.
In: Molecular Ecology. Vol. 27 (2018) Issue 5 . - pp. 1324-1337.
ISSN 1365-294X

Abstract in another language

The climbing orchid Erythrorchis altissima is the largest mycoheterotroph in the world. Although previous in vitro work suggests that E. altissima has a unique symbiosis with wood-decaying fungi, little is known about how this giant orchid meets its carbon and nutrient demands exclusively via mycorrhizal fungi. In this study, the mycorrhizal fungi of E. altissima were molecularly identified using root samples from 26 individuals. Furthermore, in vitro symbiotic germination with five fungi and stable isotope compositions in five E. altissima at one site were examined. In total, 37 fungal operational taxonomic units (OTUs) belonging to nine orders in Basidiomycota were identified from the orchid roots. Most of the fungal OTUs were wood-decaying fungi, but underground roots had ectomycorrhizal Russula. Two fungal isolates from mycorrhizal roots induced seed germination and subsequent seedling development in vitro. Measurement of carbon and nitrogen stable isotope abundances revealed that E. altissima is a full mycoheterotroph whose carbon originates mainly from wood-decaying fungi. All of the results show that E. altissima is associated with a wide range of wood- and soil-inhabiting fungi, the majority of which are wood-decaying taxa. This generalist association enables E. altissima to access a large carbon pool in woody debris and has been key to the evolution of such a large mycoheterotroph.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER144684
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 04 Apr 2019 07:36
Last Modified: 04 Apr 2019 07:36