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Mycelial responses of the soil fungus, Mortierella isabellina, to grazing by Onychiurus armatus (collembola)

Hedlund, Katarina LU ; Boddy, Lynne and Preston, Christine M. (1991) In Soil Biology and Biochemistry 23(4). p.361-366
Abstract

Hyphal morphology and extracellular enzyme production of the fungus Mortierella isabellina were studied during grazing by a soil Collembola, Onychiurus armatus. Grazing induced switching from a "normal" hyphal mode, with appressed growth and sporulating hyphae, to fan shaped sectors of fast growing and nonsporulating mycelium which developed extensive aerial mycelium. Specific protease and α-amylase activities were several times higher in grazed cultures where switching occurred compared with plates without switching. Increased protease activity was localized to switched sectors within the mycelium. On the basis of inhibitor studies, the protease of "normal" mycelium was classified as a metalloprotease. Switching induced activity of an... (More)

Hyphal morphology and extracellular enzyme production of the fungus Mortierella isabellina were studied during grazing by a soil Collembola, Onychiurus armatus. Grazing induced switching from a "normal" hyphal mode, with appressed growth and sporulating hyphae, to fan shaped sectors of fast growing and nonsporulating mycelium which developed extensive aerial mycelium. Specific protease and α-amylase activities were several times higher in grazed cultures where switching occurred compared with plates without switching. Increased protease activity was localized to switched sectors within the mycelium. On the basis of inhibitor studies, the protease of "normal" mycelium was classified as a metalloprotease. Switching induced activity of an additional serine protease. Anion-exchange chromatography showed that the two proteases had similar charges and, according to SDS-gclatine-PAGE. the molecular weight of the serine protease was 80.000. Switching to a fast growing hyphal mode could be one explanation for compensatory growth of grazed fungi.

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Contribution to journal
publication status
published
subject
in
Soil Biology and Biochemistry
volume
23
issue
4
pages
361 - 366
publisher
Elsevier
external identifiers
  • scopus:0001354440
ISSN
0038-0717
DOI
10.1016/0038-0717(91)90192-M
language
English
LU publication?
yes
id
a974ad2b-9462-4905-9587-df0c00348f46
date added to LUP
2019-01-02 12:36:27
date last changed
2019-01-10 16:39:20
@article{a974ad2b-9462-4905-9587-df0c00348f46,
  abstract     = {<p>Hyphal morphology and extracellular enzyme production of the fungus Mortierella isabellina were studied during grazing by a soil Collembola, Onychiurus armatus. Grazing induced switching from a "normal" hyphal mode, with appressed growth and sporulating hyphae, to fan shaped sectors of fast growing and nonsporulating mycelium which developed extensive aerial mycelium. Specific protease and α-amylase activities were several times higher in grazed cultures where switching occurred compared with plates without switching. Increased protease activity was localized to switched sectors within the mycelium. On the basis of inhibitor studies, the protease of "normal" mycelium was classified as a metalloprotease. Switching induced activity of an additional serine protease. Anion-exchange chromatography showed that the two proteases had similar charges and, according to SDS-gclatine-PAGE. the molecular weight of the serine protease was 80.000. Switching to a fast growing hyphal mode could be one explanation for compensatory growth of grazed fungi.</p>},
  author       = {Hedlund, Katarina and Boddy, Lynne and Preston, Christine M.},
  issn         = {0038-0717},
  language     = {eng},
  month        = {01},
  number       = {4},
  pages        = {361--366},
  publisher    = {Elsevier},
  series       = {Soil Biology and Biochemistry},
  title        = {Mycelial responses of the soil fungus, Mortierella isabellina, to grazing by Onychiurus armatus (collembola)},
  url          = {http://dx.doi.org/10.1016/0038-0717(91)90192-M},
  volume       = {23},
  year         = {1991},
}