Abstract

The arbuscular mycorrhizal (AM) symbiosis is ubiquitous, and the fungus represents a major pathway for carbon movement in the soil-plant system. Here, we investigated the impacts of AM colonization of Plantago lanceolata and temperature on the regulation of root respiration (R).Warm-grown AM plants exhibited higher rates of R than did nonAM plants, irrespective of root mass. AM plants exhibited higher maximal rates of R (R-max - R measured in the presence of an uncoupler and exogenous substrate) and greater proportional use of R-max as a result of increased energy demand and/or substrate supply. The higher R values exhibited by AM plants were not associated with higher maximal rates of cytochrome c oxidase (COX) or protein abundance of either the COX or the alternative oxidase.Arbuscular mycorrhizal colonization had no effect on the short-term temperature dependence (Q(10)) of R. Cold-acclimated nonAM plants exhibited higher rates of R than their warm-grown nonAM counterparts. By contrast, chilling had a negligible effect on R of AM-plants. Thus, AM plants exhibited less cold acclimation than their nonAM counterparts.Overall, these results highlight the way in which AM colonization alters the underlying components of respiratory metabolism and the response of root R to sustained changes in growth temperature.New Phytologist (2009) 182: 188-199doi: 10.1111/j.1469-8137.2008.02727.x.

Keywords

acclimation; arbuscular mycorrhizal (AM) fungi; protein abundance; Q(10); root respiration (R); temperature

Published in

New Phytologist
2009, Volume: 182, number: 1, pages: 188-199
Publisher: WILEY-BLACKWELL

UKÄ Subject classification

Ecology


Publication identifier

DOI: https://doi.org/10.1111/j.1469-8137.2008.02727.x

Permanent link to this page (URI)

https://res.slu.se/id/publ/76338