Record ID No. |
102 |
Author(s) |
Cavagnaro T.R., Smith F.A., Hay G., Carne-Cavagnaro V.L., Smith S.E. , 2004 |
Affiliation |
University of California Davis, Department of Land Air & Water Resources, 1 Shields Ave, Davis, CA 95616 |
Title |
Inoculum type does not affect overall resistance of an arbuscular mycorrhiza-defective tomato mutant to colonisation but inoculation does change competitive interactions with wild-type tomato |
Source. Vol.(no):Page |
New Phytologist. 161(2): 485-494p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Soil plant relations |
Sub-subjects |
Nursery Management |
Host |
Tomato, Lycopersicum spp, Wild type tomato, Nurse plants |
Organism |
Glomuse coronatum |
Country |
California, North America |
Abstracts |
The influence of inoculum type on colonisation of a
mycorrhiza-defective tomato mutant, rmc, by the AM fungus Glomus
coronatum was studied by comparing inoculum composed
predominantly of spores with hyphae growing from mycorrhizal
'nurse plants', including the wild-type tomato progenitor (WT),
other Lycopersicon species, and leek.Colonisation of rmc was not
primarily influenced by inoculum source; minor differences could
be attributed to differences in inoculum potential. The mutation
is therefore different from other mycorrhiza-defective tomato
mutants.Growth of rmc was reduced in the presence of nurse
plants, because of competition with them, so a second experiment
examined the effects of AM colonisation on competition between
rmc and the WT tomato. This experiment was a replacement series
in which rmc and WT were grown in competition and as single
plants, inoculated with G. coronatum or uninoculated.The WT did
not respond to G. coronatum when grown alone, but responded
positively when in competition with rmc. We conclude from the
second experiment that mycorrhizal responsiveness is influenced
by competition with (in this case) a surrogate nonhost plant rmc
in a situation that mimics interspecific competition. It is
therefore a community-based parameter. Results are discussed in
the context of responses of mycorrhizal vs nonmycorrhizal
species and competition in natural plant ecosytems
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