Induced suppressiveness to<Emphasis Type="Italic">Fusarium oxysporum</Emphasis> f.sp.<Emphasis Type="Italic">radicis lycopersici</Emphasis> in rockwool substrate used in closed soilless systems |
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Authors: | Andrea Minuto Francesca Clematis Maria Lodovica Gullino Angelo Garibaldi |
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Institution: | (1) Dpto. di Valorizzazione e Protezione delle Risorse Agroforestali (Di.Va.P.R.A.), University of Torino, 10095 Grugliasco, Italy;(2) Center of Competence for the Innovation in the Agro-environmental Sector (AGROINNOVA), University of Torino, 10095 Grugliasco, Italy |
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Abstract: | Tomatoes grown in soilless systems can be seriously damaged byFusarium oxysporum Schlect f.sp.radicis lycopersici (Forl) causing Fusarium crown and root rot (FCRR). FCRR suppression can be achieved through the use of chemicals, selected substrates,
composts and artificially introduced antagonistic microorganisms. This study evaluated the natural capacity of a used rockwool
to suppress FCRR infections. New and used rockwool, sampled from closed soilless systems, was either autoclaved or not, either
artificially inoculated withForl or not and, finally, sown with tomato seeds cv. ‘Cuore di Bue’. The effects of autoclaved/non-autoclaved and used/new rockwool
on FCRR incidence were assessed by evaluating the symptoms of crown rot on the root — shoot transition zone of tomato seedlings.
Non-autoclaved and inoculated used rockwool significantly reduced FCRR incidence when compared with non-autoclaved and inoculated
new rockwool. Autoclaved and inoculated used rockwool did not suppress FCRR, similarly to new and inoculated rockwool. These
findings are in accordance with other research that, on a cucumber/Pythium host/pathogen complex in a closed rockwool soilless system, demonstrated the key role of resident microflora in suppressing
the root rot disease.
http://www.phytoparasitica.org posting Dec. 8, 2006. |
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Keywords: | Fusarium crown and root rot tomato disease suppressiveness |
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