Temperature dependence of respiration in roots colonized by arbuscular mycorrhizal fungi
2009 (English)In: New Phytologist, ISSN 0028-646X, E-ISSN 1469-8137, Vol. 182, no 1, 188-199 p.Article in journal (Refereed) Published
* 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.
Place, publisher, year, edition, pages
2009. Vol. 182, no 1, 188-199 p.
IdentifiersURN: urn:nbn:se:umu:diva-20884DOI: 10.1111/j.1469-8137.2008.02727.xPubMedID: 19140938OAI: oai:DiVA.org:umu-20884DiVA: diva2:209812