Pathogenic and genetic characterization of Iranian isolates of Fusarium oxysporum f. sp. Lentis by ISSR analysis
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Abstract
Lentis (Lens culinaris Medik.) is an important widely cultivated food legume crop in Iran. The wilt disease caused by Fusarium oxysporum f.sp. lentis has been observed in high incidence rates during recent years(2007-2008) and has caused high losses in some of the cultivated areas. In order to study the pathogenicity and genetic diversity of Fusarium oxysporum f. sp. Lentis (Fol) isolates. Forty five isolates of Fusarium oxysporum f. sp. Lentis isolated from wilted lentis plants collected from different lentis growing areas in Iran, with two isolates from ICARDA were investigated. A pathogenicity test were performed for all isolates. Results showed that the Fol isolates differ in their aggressiveness on the susceptible lines could be grouped into 3 categories based on bayaa scales. The amount of genetic variation were evaluated by ISSR technique, using six primers, all of them could show the diversity between isolates. The most diversity was observed by primers (CAG)5 and ISSR10 (93%) and the minimal diversity by ISSR02 (50%). Six ISSR primers produced 156 fragments that the number of fragment was variable, ranging from 6 to 17 fragments in each profile. The analysis showed that F. oxysporum f .sp. lentis isolates could be differentiated into 6 groups at 74% similarity, and that could partially separate isolates based on their geographical regions. But could not found any correlation between this marker and pathogenesis grouping.
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