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Soil bacteria respond to presence of roots but not to mycelium of arbuscular mycorrhizal fungi

Olsson, P.A.; Bååth, Erland LU ; Jakobsen, I. and Söderström, Bengt LU (1996) In Soil Biology & Biochemistry 28(4-5). p.463-470
Abstract
Arbuscular mycorrhizal (AM) cucumber seedlings and uncolonized controls were grown in growth chambers which allowed separation of compartments with roots from compartments with the extraradical mycelium alone. Two fungi, Glomus invermaium Hall and G. caledonium (Nicol. and Gerd.) Trappe and Gerdemann, were used. Bacterial numbers (direct and viable count) and activities (thymidine incorporation) were highest in the root compartment, but were not affected by the AM mycelium after 30 days of plant growth. The soil was stored after harvest for 16 d at 13 degrees C to study the effect of disconnected mycorrhizal hyphae on bacterial activity. This treatment increased bacterial activity in mycorrhizal treatments compared to non-mycorrhizal... (More)
Arbuscular mycorrhizal (AM) cucumber seedlings and uncolonized controls were grown in growth chambers which allowed separation of compartments with roots from compartments with the extraradical mycelium alone. Two fungi, Glomus invermaium Hall and G. caledonium (Nicol. and Gerd.) Trappe and Gerdemann, were used. Bacterial numbers (direct and viable count) and activities (thymidine incorporation) were highest in the root compartment, but were not affected by the AM mycelium after 30 days of plant growth. The soil was stored after harvest for 16 d at 13 degrees C to study the effect of disconnected mycorrhizal hyphae on bacterial activity. This treatment increased bacterial activity in mycorrhizal treatments compared to non-mycorrhizal control soils. The highest increase was found in the root compartment. The bacterial community structure was studied by analyzing the phospholipid fatty acid (PLEA) pattern. The bacteria specific PLFAs cy17:0 and cy19:0 increased in both experiments in the root compartments. The PLFAs 15:0 and 17:0, which are usually considered to be bacteria specific, also increased due to the presence of roots, but it was shown that these fatty acids were present in aseptically grown cucumber roots, and thus not bacteria specific. No bacterial PLFAs were affected by the presence of mycorrhiza. Copyright (C) 1996 Elsevier Science Ltd (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Soil Biology & Biochemistry
volume
28
issue
4-5
pages
463 - 470
publisher
Elsevier
external identifiers
  • scopus:0030111886
ISSN
0038-0717
DOI
10.1016/0038-0717(96)00011-9
language
English
LU publication?
yes
id
155cb735-33ae-484c-a913-c6509d0971c4 (old id 2226273)
date added to LUP
2012-01-13 12:54:58
date last changed
2017-08-20 03:35:46
@article{155cb735-33ae-484c-a913-c6509d0971c4,
  abstract     = {Arbuscular mycorrhizal (AM) cucumber seedlings and uncolonized controls were grown in growth chambers which allowed separation of compartments with roots from compartments with the extraradical mycelium alone. Two fungi, Glomus invermaium Hall and G. caledonium (Nicol. and Gerd.) Trappe and Gerdemann, were used. Bacterial numbers (direct and viable count) and activities (thymidine incorporation) were highest in the root compartment, but were not affected by the AM mycelium after 30 days of plant growth. The soil was stored after harvest for 16 d at 13 degrees C to study the effect of disconnected mycorrhizal hyphae on bacterial activity. This treatment increased bacterial activity in mycorrhizal treatments compared to non-mycorrhizal control soils. The highest increase was found in the root compartment. The bacterial community structure was studied by analyzing the phospholipid fatty acid (PLEA) pattern. The bacteria specific PLFAs cy17:0 and cy19:0 increased in both experiments in the root compartments. The PLFAs 15:0 and 17:0, which are usually considered to be bacteria specific, also increased due to the presence of roots, but it was shown that these fatty acids were present in aseptically grown cucumber roots, and thus not bacteria specific. No bacterial PLFAs were affected by the presence of mycorrhiza. Copyright (C) 1996 Elsevier Science Ltd},
  author       = {Olsson, P.A. and Bååth, Erland and Jakobsen, I. and Söderström, Bengt},
  issn         = {0038-0717},
  language     = {eng},
  number       = {4-5},
  pages        = {463--470},
  publisher    = {Elsevier},
  series       = {Soil Biology & Biochemistry},
  title        = {Soil bacteria respond to presence of roots but not to mycelium of arbuscular mycorrhizal fungi},
  url          = {http://dx.doi.org/10.1016/0038-0717(96)00011-9},
  volume       = {28},
  year         = {1996},
}