Temperature dependence of respiration in roots colonized by arbuscular mycorrhizal fungi

TY - JOUR

T1 - Temperature dependence of respiration in roots colonized by arbuscular mycorrhizal fungi

AU - Atkin, Owen K.

AU - Sherlock, David

AU - Fitter, Alastair H.

AU - Jarvis, Susan

AU - Hughes, John K.

AU - Campbell, Catherine

AU - Hurry, Vaughan

AU - Hodge, Angela

PY - 2009/4

Y1 - 2009/4

N2 - 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.

AB - 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.

KW - acclimation

KW - arbuscular mycorrhizal (AM) fungi

KW - protein abundance

KW - Q(10)

KW - root respiration (R)

KW - temperature

KW - RELATIVE GROWTH-RATE

KW - ALTERNATIVE OXIDASE

KW - THERMAL-ACCLIMATION

KW - PLANT RESPIRATION

KW - SOIL RESPIRATION

KW - SCALING RELATIONSHIPS

KW - DARK RESPIRATION

KW - CYANIDE-RESISTANT

KW - CARBON SINK

KW - SHORT-TERM

UR - http://www.scopus.com/inward/record.url?scp=61649103160&partnerID=8YFLogxK

U2 - 10.1111/j.1469-8137.2008.02727.x

DO - 10.1111/j.1469-8137.2008.02727.x

M3 - Article

SN - 0028-646X

VL - 182

SP - 188

EP - 199

JO - New Phytologist

JF - New Phytologist

IS - 1

ER -