Imperial College London
Portrait Picture

ProfessorMartinBidartondo

Faculty of Natural Sciences, Department of Life Sciences (Silwood Park)

Professor of Molecular Ecology
 
 
 
//

Contact

 

+44 (0)20 8332 5382m.bidartondo Website

 
 
//

Location

 

Jodrell GateRoyal Botanic GardensRoyal Botanic Gardens

//

Summary

 

Publications

Citation

BibTex format

@article{Schweiger:2018:10.1111/1365-2435.13042,
author = {Schweiger, JM-I and Bidartondo, MI and Gebauer, G},
doi = {10.1111/1365-2435.13042},
journal = {Functional Ecology},
pages = {870--881},
title = {Stable isotope signatures of underground seedlings reveal the organic matter gained by adult orchids from mycorrhizal fungi},
url = {http://dx.doi.org/10.1111/1365-2435.13042},
volume = {32},
year = {2018}
}
Download

RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Orchids produce dust seeds dependent on the provision of organic carbon by mycorrhizal fungi for their early development stages. Hence, all chlorophyllous orchids experience a dramatic switch in trophic strategies from initial mycoheterotrophy to either autotrophy or partial mycoheterotrophy during ontogeny. Yet, the degree to which partially mycoheterotrophic orchids gain carbon from their mycorrhizal fungi is unclear based on existing approaches.    Here, we propose a novel approach to quantify the fungalderived organic matter gain of chlorophyllous mature orchids mycorrhizal with rhizoctonia fungi, using the stable isotope signatures of their fully mycoheterotrophic (FMH) seedlings in a linear twosource mixing model.    We conducted a field germination experiment with seven orchid species and measured carbon, nitrogen and hydrogen stable isotope natural abundances and nitrogen concentrations of mature orchids, underground seedlings, and autotrophic references.    After in situ burial for 19–30 months, germination rates varied considerably among five orchid species and failed for two. On average, underground seedlings were enriched in 13C and 15N relative to mature orchids and had higher nitrogen concentrations. Using the mean enrichment factors ε13C and ε2H of seedlings as FMH endpoint, the organic matter gain derived by mature orchids from mycorrhizas was c. 20%.    Chlorophyllous orchids mycorrhizal with rhizoctonias are predisposed to partially mycoheterotrophic nutrition due to their initially mycoheterotrophic seedling stage. We show that the carbon and hydrogen isotope abundances of underground seedlings can be used in an improved mixingmodel to identify a significant proportion of fungalderived organic matter in mature orchids.
AU  - Schweiger,JM-I
AU  - Bidartondo,MI
AU  - Gebauer,G
DO  - 10.1111/1365-2435.13042
EP  - 881
PY  - 2018///
SN  - 0269-8463
SP  - 870
TI  - Stable isotope signatures of underground seedlings reveal the organic matter gained by adult orchids from mycorrhizal fungi
T2  - Functional Ecology
UR  - http://dx.doi.org/10.1111/1365-2435.13042
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000429323400003&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - http://hdl.handle.net/10044/1/61027
VL  - 32
ER  -
Download