Acclimation to temperature and temperature sensitivity of metabolism by ectomycorrhizal fungi

Authors

  • GLENNA M. MALCOLM,

    1. Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, University Park, PA 16802, USA,
    Search for more papers by this author
  • JUAN C. LÓPEZ-GUTIÉRREZ,

    1. The Holden Arboretum/Case Western University, Kirtland, OH 44094, USA
    Search for more papers by this author
  • ROGER T. KOIDE,

    1. Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, University Park, PA 16802, USA,
    2. Department of Horticulture, The Pennsylvania State University, University Park, PA 16802, USA,
    Search for more papers by this author
  • DAVID M. EISSENSTAT

    1. Intercollege Graduate Degree Program in Ecology, The Pennsylvania State University, University Park, PA 16802, USA,
    2. Department of Horticulture, The Pennsylvania State University, University Park, PA 16802, USA,
    Search for more papers by this author

Errata

This article is corrected by:

  1. Errata: Acclimation to temperature and temperature sensitivity of metabolism by ectomycorrhizal fungi Volume 15, Issue 9, 2333, Article first published online: 4 August 2009

Glenna M. Malcolm, tel. +1814 863 7749, fax +1814 863 6139, e-mail: gmm193@psu.edu

Abstract

Ectomycorrhizal (ECM) fungi contribute significantly to ecosystem respiration, but little research has addressed the effect of temperature on ECM fungal respiration. Some plants have the ability to acclimate to temperature such that long-term exposure to warmer conditions slows respiration at a given measurement temperature and long-term exposure to cooler conditions increases respiration at a given measurement temperature. We examined acclimation to temperature and temperature sensitivity (Q10) of respiration by ECM fungi by incubating them for a week at one of three temperatures and measuring respiration over a range of temperatures. Among the 12 ECM fungal isolates that were tested, Suillus intermedius, Cenococcum geophilum, and Lactarius cf. pubescens exhibited significant acclimation to temperature, exhibiting an average reduction in respiration of 20–45% when incubated at 23 °C compared with when incubated at 11 or 17 °C. The isolates differed significantly in their Q10 values, which ranged from 1.67 to 2.56. We also found that half of the isolates significantly increased Q10 with an increase in incubator temperature by an average of 15%. We conclude that substantial variation exists among ECM fungal isolates in their ability to acclimate to temperature and in their sensitivity to temperature. As soil temperatures increase, ECM fungi that acclimate may require less carbon from their host plants than fungi that do not acclimate. The ability of some ECM fungi to acclimate may partially ameliorate the anticipated positive feedback between soil respiration and temperature.

Ancillary