אסיף מאגר המחקר החקלאי

Vegetative compatibility grouping of Fusarium oxysporum f. sp. gladioli from saffron

Year:

2002

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Volume :

108

Co-Authors:

Di Primo, P., Lab. for Pest Management Research, Inst. of Agricultural Engineering, Volcani Center, Bet Dagan 50250, Israel
Cappelli, C., Dipto. Arboricoltura Protez. Piante, Università di Perugia, Borgo XX Giugno 74, 06121 Perugia, Italy
Katan, T., Department of Plant Pathology, ARO, Volcani Center, Bet Dagan 50250, Israel

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Abstract:

Fusarium corm rot of saffron (Crocus sativus L.), incited by Fusarium oxysporum f. sp. gladioli, causes severe yield losses in Italy. Major symptoms during flowering (October-November) include yellowing and wilting of shoots, basal stem rot and corm rot. Sixty-four isolates of F. oxysporum f. sp. gladioli, obtained from infected saffron crops located in Italy (Abruzzi, Tuscany and Umbria) and in Spain, were characterized by pathogenicity and vegetative compatibility. Chlorate-resistant, nitrate-nonutilizing (nit) mutants were used to determine vegetative compatibility among the isolates of the pathogen with the aim of examining the genetic relatedness among populations from different locations. All the isolates belonged to vegetative compatibility group 0340. Since saffron shares susceptibility to F. oxysporum f. sp. gladioli with other ornamental plants of the Iridaceae (Crocus, Gladiolus, Iris and Ixia), it is likely that a clone of the pathogen (VCG 0340) was introduced with other hosts and is responsible for the disease outbreak observed on saffron in Italy. Alternatively, or additionally, the clone of F. oxysporum f. sp. gladioli causing disease on saffron in other countries may have spread to the saffron fields in Italy through the import and dispersal of infested propagation material.

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