Carbon and Nitrogen Metabolism in Mycorrhizal Networks and Mycoheterotrophic Plants of Tropical Forests: A Stable Isotope Analysis  | Zendy

PierreEmmanuel Courty | Zendy; Florian Walder | Zendy; Thomas Boller | Zendy; Kurt Ineichen | Zendy; Andres Wiemken | Zendy; Alain Rousteau | Zendy; MarcAndré Selosse | Zendy

Open Access

Carbon and Nitrogen Metabolism in Mycorrhizal Networks and Mycoheterotrophic Plants of Tropical Forests: A Stable Isotope Analysis

Author(s) -

PierreEmmanuel Courty,

Florian Walder,

Thomas Boller,

Kurt Ineichen,

Andres Wiemken,

Alain Rousteau,

MarcAndré Selosse

Publication year - 2011

Publication title -

plant physiology

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.554

H-Index - 312

eISSN - 1532-2548

pISSN - 0032-0889

DOI - 10.1104/pp.111.177618

Subject(s) - rainforest , temperate rainforest , biology , temperate climate , botany , δ13c , tropical rainforest , nitrogen cycle , tropics , symbiosis , temperate forest , nutrient , ecology , nitrogen , ecosystem , stable isotope ratio , chemistry , genetics , organic chemistry , bacteria , physics , quantum mechanics

Most achlorophyllous mycoheterotrophic (MH) plants obtain carbon (C) from mycorrhizal networks and indirectly exploit nearby autotrophic plants. We compared overlooked tropical rainforest MH plants associating with arbuscular mycorrhizal fungi (AMF) to well-reported temperate MH plants associating with ectomycorrhizal basidiomycetes. We investigated (13)C and (15)N abundances of MH plants, green plants, and AMF spores in Caribbean rainforests. Whereas temperate MH plants and fungi have higher δ(13)C than canopy trees, these organisms displayed similar δ(13)C values in rainforests, suggesting differences in C exchanges. Although temperate green and MH plants differ in δ(15)N, they display similar (15)N abundances, and likely nitrogen (N) sources, in rainforests. Contrasting with the high N concentrations shared by temperate MH plants and their fungi, rainforest MH plants had lower N concentrations than AMF, suggesting differences in C/N of exchanged nutrients. We provide a framework for isotopic studies on AMF networks and suggest that MH plants in tropical and temperate regions evolved different physiologies to adapt in diverging environments.

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