Record ID No. |
1954 |
Author(s) |
Duponnois R., Kisa M., Prin Y., Ducousso M., Plenchette C., Lepage M., Galiana A , 2008 |
Affiliation |
Ctr Rech Bel Air, IRD, Lab Commun Microbiol IRD ISRA UCAD, BP 1386, Dakar, SENEGAL |
Title |
Soil factors influencing the growth response of Acacia holosericea A. Cunn. ex G. Don to ectomycorrhizal inoculation |
Source. Vol.(no):Page |
New Forests.35(2):105-117p. |
Categories |
Arbuscular Mycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
SENEGAL, Africa |
Abstracts |
Australian acacias like Acacia holosericea are excellent candidates for the
revegetation of arid zones in Africa. Their high ability to develop multiple symbioses with soil
microorganisms is crucial to their rapid development in adverse climatic and edaphic conditions.
These symbioses include nitrogen fixation with rhizobia, vesicular arbuscular mycorrhization and
ectomycorrhization. We set up an experiment to test the growth response of A. Holosericea to
ectomycorrhizal inoculation in 13 different soils from Senegal. After autoclaving the soil, the
experiment was conducted in a greenhouse for four weeks. Plants were inoculated with Pisolithus
albus strain IR100. The following parameters were measured: plant biomass, N, P, K and Ca foliar
composition, spontaneous nodulation rate, and ectomycorrhizal colonization. Data were analyzed in
light of the physical, chemical and total microbial characteristics of the soil. The results
demonstrated a global promoting effect of P. Albus inoculation on plant (shoot and root) growth
and on foliar P and K, together with a depressive effect on N, while Ca rates were barely
affected. Interestingly, spontaneous nodulation with putative water- or airborne rhizobia was
stimulated after P. Albus inoculation. However, these nodules seemed poorly effective, as they
failed to cause any change in plant growth or in foliar N composition within the nodulated and
nonnodulated control plants. These results show that plant growth response to ectomycorrhizal
inoculation is greatly dependent on soil characteristics, and that root ectomycorrhizal
colonization is influenced by biotic factors such as soil microbiota. From a practical point of
view, data from the present study demonstrate that it is possible to optimize the effect of fungi
on plant growth by screening soils under nursery conditions. |