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Plant Biol (Stuttg) 2007; 9(4): 545-549
DOI: 10.1055/s-2006-955946
Short Research Paper

Georg Thieme Verlag Stuttgart KG · New York

Temperature-Respiration Relationships Differ in Mycorrhizal and Non-Mycorrhizal Root Systems of Picea abies (L.) Karst.

N. Koch1 , C. P. Andersen2 , S. Raidl3 , R. Agerer3 , R. Matyssek1 , T. E. E. Grams1
  • 1Department of Ecology, Ecophysiology of Plants, Technische Universität München, Am Hochanger 13, 85354 Freising, Germany
  • 2US Environmental Protection Agency, Western Ecology Division, National Health and Environmental Effects Research Laboratory, Office of Research and Development, 200 SW 35th Street, Corvallis, Oregon 97333, USA
  • 3Department Biology I and GeoBio-CenterLMU, Biodiverstity Research, Systematic Mycology, Ludwig-Maximilians-Universität München, Menzinger Straße 67, 80638 München, Germany
Further Information

Publication History

Received: September 12, 2006

Accepted: October 30, 2006

Publication Date:
15 February 2007 (online)

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Abstract

Root respiration has been shown to increase with temperature, but less is known about how this relationship is affected by the fungal partner in mycorrhizal root systems. In order to test respiratory temperature dependence, in particular Q10 of mycorrhizal and non-mycorrhizal root systems, seedlings of Picea abies (L.) Karst. (Norway spruce) were inoculated with the ectomycorrhizal fungus Piloderma croceum (Eriksson and Hjortstam, SR430; synonym: Piloderma fallax: [Libert] Stalpers) and planted in soil respiration cuvettes (mycocosms). Temperature dependence of hyphal respiration in sterile cultures was determined and compared with respiration of mycorrhizal roots. Respiration rates of mycorrhizal and non-mycorrhizal root systems as well as sterile cultures were sensitive to temperature. Q10 of mycorrhizal root systems of 3.0 ± 0.1 was significantly higher than that of non-mycorrhizal systems (2.5 ± 0.2). Q10 of P. croceum in sterile cultures (older than 2 months) was similar to that of mycorrhizal root systems, suggesting that mycorrhizae may have a large influence on the temperature sensitivity of roots in spite of their small biomass. Our results stress the importance of considering mycorrhization when modeling the temperature sensitivity of spruce roots.

Key words

Picea abies (L.) Karst. (Norway spruce) - Piloderma croceum - root respiration - mycorrhizal respiration - temperature dependence - Q10.

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N. Koch

Department of Ecology, Ecophysiology of Plants
Technische Universität München

Am Hochanger 13

85354 Freising

Germany

Email: kochnina@gmx.de

Editor: J. P. Sparks