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Effects of Liming on Potential Oxalate Secretion and Iron Chelation of Beech Ectomycorrhizal Root Tips.

Rineau, Francois LU and Garbaye, Jean (2010) In Microbial Ecology 60. p.331-339
Abstract
Liming is used to counteract forest decline induced by soil acidification. It consists of Ca and Mg input to forest soil and not only restores tree mineral nutrition but also modifies the availability of nutrients in soil. Ectomycorrhizal (ECM) fungi are involved in mineral nutrient uptake by trees and can recover them through dissolution of mineral surface. Oxalate and siderophore secretion are considered as the main agents of mineral weathering by ECMs. Here, we studied the effects of liming on the potential oxalate secretion and iron complexation by individual beech ECM root tips. Results show that freshly excised Lactarius subdulcis root tips from limed plots presented a high potential oxalate exudation of 177 muM tip(-1) h(-1). As... (More)
Liming is used to counteract forest decline induced by soil acidification. It consists of Ca and Mg input to forest soil and not only restores tree mineral nutrition but also modifies the availability of nutrients in soil. Ectomycorrhizal (ECM) fungi are involved in mineral nutrient uptake by trees and can recover them through dissolution of mineral surface. Oxalate and siderophore secretion are considered as the main agents of mineral weathering by ECMs. Here, we studied the effects of liming on the potential oxalate secretion and iron complexation by individual beech ECM root tips. Results show that freshly excised Lactarius subdulcis root tips from limed plots presented a high potential oxalate exudation of 177 muM tip(-1) h(-1). As this ECM species distribution is very dense, it is likely that, in the field, oxalate concentrations in the vicinity of its clusters could be very high. This points out that not only extraradical mycelium but also ECM root tips of certain species can contribute significantly to mineral weathering. Nonmetric multidimensional scaling (NMDS) separated potential oxalate production by ECM root tips in limed and untreated plots, and this activity was mainly driven by L. subdulcis ECMs, but NMDS on potential activity of iron mobilization by ECM root tips did not show a difference between limed and untreated plots. As the mean oxalate secretion did not significantly correlated with the mean iron mobilization by ECM morphotype, we conclude that iron complexation was due to either other organic acids or to siderophores. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Microbial Ecology
volume
60
pages
331 - 339
publisher
Springer
external identifiers
  • wos:000281981300008
  • scopus:77956884302
ISSN
1432-184X
DOI
10.1007/s00248-010-9697-3
project
BECC
language
English
LU publication?
yes
id
63b52f2c-31d4-49d7-b633-72a526db85ac (old id 1625715)
date added to LUP
2010-09-03 12:40:46
date last changed
2018-05-29 12:05:22
@article{63b52f2c-31d4-49d7-b633-72a526db85ac,
  abstract     = {Liming is used to counteract forest decline induced by soil acidification. It consists of Ca and Mg input to forest soil and not only restores tree mineral nutrition but also modifies the availability of nutrients in soil. Ectomycorrhizal (ECM) fungi are involved in mineral nutrient uptake by trees and can recover them through dissolution of mineral surface. Oxalate and siderophore secretion are considered as the main agents of mineral weathering by ECMs. Here, we studied the effects of liming on the potential oxalate secretion and iron complexation by individual beech ECM root tips. Results show that freshly excised Lactarius subdulcis root tips from limed plots presented a high potential oxalate exudation of 177 muM tip(-1) h(-1). As this ECM species distribution is very dense, it is likely that, in the field, oxalate concentrations in the vicinity of its clusters could be very high. This points out that not only extraradical mycelium but also ECM root tips of certain species can contribute significantly to mineral weathering. Nonmetric multidimensional scaling (NMDS) separated potential oxalate production by ECM root tips in limed and untreated plots, and this activity was mainly driven by L. subdulcis ECMs, but NMDS on potential activity of iron mobilization by ECM root tips did not show a difference between limed and untreated plots. As the mean oxalate secretion did not significantly correlated with the mean iron mobilization by ECM morphotype, we conclude that iron complexation was due to either other organic acids or to siderophores.},
  author       = {Rineau, Francois and Garbaye, Jean},
  issn         = {1432-184X},
  language     = {eng},
  pages        = {331--339},
  publisher    = {Springer},
  series       = {Microbial Ecology},
  title        = {Effects of Liming on Potential Oxalate Secretion and Iron Chelation of Beech Ectomycorrhizal Root Tips.},
  url          = {http://dx.doi.org/10.1007/s00248-010-9697-3},
  volume       = {60},
  year         = {2010},
}