Fernandez Diana auteur aut IRD Ouinten Mohamed auteur aut IRD Tantaoui A. auteur aut IRD Geiger Jean-Paul auteur aut IRD text journalArticle eng text/pdf reformatted digital access The genetic diversity of the date palm wilt pathogen Fusarium oxysporum f. sp. albedinis in Algeria was assessed using vegetative compatibility, restriction fragment length polymorphism (RFLP) of mitochondrial DNA (mtDNA), and random amplified polymorphic DNA (RAPD). Ninety-eight isolates were collected from the main infested regions, Touat, Gourara and Mzab, and 6 isolates from Morocco were added for comparison. All isolates were vegetatively compatible and belonged to VCG 0170. No variation was detected in the mtDNA of a subset of 73 isolates and the RAPD analysis indicated that they were genetically very closely related. However, some geographic substructuring was apparent, suggesting that local diversification of the pathogen might have occurred. These results provide evidence that the Algerian isolates of F. oxysporum s. sp. albedinis belong to a same clonal lineage and support the hypothesis that they were probably founded by a single virulent clone that originated from the Moroccan oases where the date palm wilt (Bayoud disease) was first detected. Based on similarity of RAPD patterns occurring in different oases, and on historical records of the Bayoud disease in Algeria, spread of the pathogen in the different regions is discussed. (Résumé d'auteur) specialized PATHOLOGIE VEGETALE CHAMPIGNON PARASITE VARIABILITE GENETIQUE BIOLOGIE MOLECULAIRE GENETIQUE DE POPULATION 076MALPLA 103 5 485-490 1997 0929-1873 https://www.documentation.ird.fr/hor/fdi:010011162 10.1023/A:1008644515046 0929-1873 [F B010011162] https://www.documentation.ird.fr/hor/fdi:010011162 https://horizon.documentation.ird.fr/exl-doc/pleins_textes/pleins_textes_6/b_fdi_47-48/010011162.pdf IRD - Base Horizon / Pleins textes 1997-10-07 2017-08-07 fdi:010011162 fre