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evaluation. --- evaluation --- Triticum aestivum --- Disease resistance

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Wheats --- Triticum aestivum --- Disease resistance --- Fusarium culmorum

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Crops --- Crops --- Plant diseases --- Plant diseases --- Disease resistance --- Disease resistance --- Selection. --- Selection

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Isolates of Phaeoisariopsis griseola, collected for the most in Africa, were characterized according to their virulence properties and their molecular patterns. Differences in symptom intensities caused by the isolates on the inoculated plant genotypes revealed an important pathogenic variability and complexity. SSCP analysis on ITS sequence of the ribosomal DNA as well as RAPD analysis were used for molecular characterization of the isolates. It has been observed that some isolates with dissimilar patterns were collected within a same area. Simultaneously, similar molecular patterns have been found for isolates collected in different sites. However, the molecular similarity is higher among isolates collected within a same area. Analysis of the reactions observed on the plant genotypes after their inoculation revealed the existence of vertical resistance genes in Phaseolus vulgaris as well as in its secondary gene pool. Interspecific hybridization between the genotype NI666 (Phaseolus coccineus), resistant to all the isolates tested, and the genotype Aroana (P. vulgaris), susceptible to most of the isolates, gave F1 hybrid plants resistant to angular leaf spot disease.

Phaseolus vulgaris --- Phaseolus vulgaris --- Phaeoisariopsis --- Phaeoisariopsis --- Pathogenicity --- Pathogenicity --- Genetic polymorphism --- Genetic polymorphism --- Disease resistance --- Disease resistance

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Rhizosphere. --- Rhizosphere --- Bacillus subtilis --- Bacillus subtilis --- Biopesticides --- Biopesticides --- Disease resistance --- Disease resistance --- Defence mechanisms --- Defence mechanisms