Controlled mycorrhization applied to improving the productivity of eucalyptus industrial plantations in the wet tropics
biotec at goliat.ugr.es
biotec at goliat.ugr.es
Thu Mar 6 10:50:44 EST 1997
A project entitled Controlled mycorrhization applied to improving
the productivity of eucalyptus industrial plantations in the wet
tropics lead by Dr. J. Garbaye of INRA-France, in partnership with
other scientific institutions in France, Portugal, Brazil and Congo
was carried out under the European Union (D.G.XII) STD2 scientific
In a way this project is a follow up to another one STD1 programme,
focusing the application of controlled mycorrhization to pines in
The objective of the present research was to get knowledge about
symbiosis, specially concerned with types, distribution,
specificity, inoculation methods and some environmental effects. On
a more technical approach, to go further on the knowledge of
inoculation procedures, selection of fungal strains and the setting
up of experimental plantations.
The mycorrhizal status of eucalyptus was studied in plantation
(Congo and Brazil) and native stand (Australia and Papua Guinea).
The mechanisms of specificity plant-fungus were tested in
laboratory an differences on behaviour among fungal strains and
among eucalyptus species were also investigated, as well as the
effect of drought stress on the symbiosis. Also was tested the
ability of the fungal strains to solubilize the rock phosphate and
transfer orthophosphate to the root.
Tests were undertaken, in pots, nursery and greenhouse to evaluate
the environmental effects of ectomycorrhiza formation and for
optimising inoculation techniques.
In Portugal and Brazil different strains of Cenococum Geophilum,
Pisolithos tinctorius and mycorrhiza were compared with native
fungi from Australia, on seven plantations, which plants have been
inoculated in the nursery.
In several areas auspicious results were obtained, especially in
what concerns the knowledge of fungal strains associated with
tropical eucalyptus in its native area.
New knowledge was achieved in the field of mechanism of
specificity, aggressiveness (rapidity of infection), interaction
between ectomycorrhiza and endomycorrhiza from the answer of
ectomycorrhiza symbiosis drought stress and the fungal ability to
solubilize the rock phosphate.
Some results are very stimulating, the best of them, point out to a
30% increase in total height at 2 years, induced by strains of
We would like to finish by quoting the final summary report: This
project yielded a wide variety of new basic knowledge on the
mycorrhizal symbioses of eucalyptus, published in 43 articles,
communications and reports.
It also provided practical tools (laboratory tests) for a rapid
screen of fungal isolates for controlled mycorrhization, and lead
to the creation of experimental plantations which will produce new
information during the next years. All the conditions are now
favourable to technical experimentation on a larger scale.
For further information please contact:
Dr J. Garbaye
Institut Nationale de la Recherche Agronomique
145 rue de lUniversité
75007 Paris (France)
Phone (1) 42 75 90 00
Fax (1) 42 75 94 86
Contract number A-093
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