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

N. Koch; C. P. Andersen; S. Raidl; R. Agerer; R. Matyssek; T. E. E. Grams

doi:10.1055/s-2006-955946

Plant Biology, Table of Contents

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-Center^LMU, Biodiverstity Research, Systematic Mycology, Ludwig-Maximilians-Universität München, Menzinger Straße 67, 80638 München, Germany

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.

Full Text

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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