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Response of Dwarf Cavendish banana plantlets to inoculation with races 1 and 4 of Fusarium oxysporum f. sp. cubense at different levels of Zn nutrition

Published online by Cambridge University Press:  15 December 2004

Marino Fernández-Falcón ,
Andrés A. Borges  and
Andrés Borges-Pérez
Marino Fernández-Falcón
Affiliation:
Instituto de Productos Naturales y Agrobiología, CSIC, Avenida Astrofísico Francisco Sánchez 3, La Laguna, 38206 Tenerife, Spain
Andrés A. Borges
Affiliation:
Instituto de Productos Naturales y Agrobiología, CSIC, Avenida Astrofísico Francisco Sánchez 3, La Laguna, 38206 Tenerife, Spain
Andrés Borges-Pérez
Affiliation:
Instituto de Productos Naturales y Agrobiología, CSIC, Avenida Astrofísico Francisco Sánchez 3, La Laguna, 38206 Tenerife, Spain
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Abstract

Introduction. The causal agent of Panama disease in banana is Fusarium oxysporum f. sp. cubense (FOC). The authors put forward a hypothesis to account for certain disturbances of the natural defence mechanisms of banana plants against Panama disease as a consequence of very low Zn levels which could alter the mechanism of tylose formation. Materials and methods. A long-term experiment was carried out with 2-month-old banana plants in a growth chamber at 23 °C using three different levels of Zn nutrition. The nutrient solutions were inoculated with FOC 1 and FOC 4. Results and discussion. None of the total plants growing in a nutrient solution inoculated with FOC 1 showed infected rhizomes at the end of the experiment, but 75% of the plants growing in pots inoculated with FOC 4 had infected rhizomes. On the other hand, rhizome infection by FOC 4 was influenced by the nutrient solutions. The data showed that the number of plants with damaged rhizomes was significantly higher in the Zn-deficient treatments (100% of plants) than in the normal Zn solution (25% of plants), these internal symptoms being seen to worsen as the presence of Zn decreased in the nutrient solution. Conclusions. The results obtained seem to confirm the role played by Zn nutrition of banana plants in the appearance of Panama disease and are in accordance with our hypothesis concerning the relationships among plant Zn nutrition, plant IAA level, tylose formation and the incidence of the disease. Likewise, under our experimental conditions, race 1 of FOC is confirmed to be non-pathogenic against this banana cultivar, while race 4 is indeed pathogenic.

Keywords

SpainMusafungal diseasespathogensFusarium oxysporumplant nutritionzincEspagneMusamaladie fongiqueagent pathogèneFusarium oxysporumnutrition des planteszinc
Type
Research Article
Information
Fruits , Volume 59 , Issue 5 , September 2004 , pp. 319 - 323
Copyright
© CIRAD, EDP Sciences

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