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Abstract
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| The specie Crocus sativus L. is cultivated for its red stigmas which, once dried, becomes one of the most valuable spice: saffron. This specie is sterile and thus its multiplication is done directly by corms. The health status of these corms is of great importance as it can serve as a source of disease inoculum in the following years of cultivation. Last year, farmers from the municipalities of Minaya and Tarazona in Albacete area (Castilla la Mancha, Spain) were concerned about the loss of production of flowers and stigmas. Yield decreased drastically and over 80% of the corms were affected by the disease. The symptoms consisted in rotted corms that were initially soft consistency, but that progress and ended up in completely corm rot with a dark color that finally dried. Microbiological analyzes with rotted corms have consistently isolated Fusarium oxysporum, such analyzes have been completed with the molecular identification of the isolates obtained. Pathogenicity tests conducted on healthy corms of saffron have reproduced rot symptoms from initial samples. Finally the pathogen was re-isolated fulfilling Koch\'s postulates. F. oxysporum is a widely distributed specie characterized by including both nonpathogenic and pathogenic strains with a marked specificity. Furthermore, F.o. species has been subdivided into special forms (f. sp.) That only attacks a specific host or a narrow range of them. These special forms can be also classified in different races which define even more the specificity of the fungus pathogenicity on only one set of genotypes within the host specie. Due to the existence of different special forms affecting saffron (f. sp. croci, f. sp. gladioli and f. sp. iridacearum), inoculations were made on different species close to saffron such as gladiolus, ornamental crocuses and daffodils. Seven different isolates from saffron were used and one isolate of F. oxysporum f. sp. gladioliwas included as a control. Results have confirmed the pathogenicity of the isolates on the different inoculated species and genotypes and allow discussing the specific pathogenicity of the causative agent or corm rot of saffron. | |
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International
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No |
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Congress
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VII Congreso Ibérico de Agroingeniería y Ciencias Hortícolas |
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960 |
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Place
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Madrid |
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Reviewers
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No |
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ISBN/ISSN
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978-84-695-8844-4 |
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Start Date
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26/08/2013 |
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End Date
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29/08/2013 |
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From page
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74 |
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To page
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74 |
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Libro de Resumenes del VII Congreso Ibérico de Agroingeniería y Ciencias Hortícolas |