Pathogenic Variability of Isolates of Pseudocercospora griseola, the Cause of Common Bean Angular Leaf Spot, and its Implications for Resistance Breeding |
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| Authors: | Kaesel Jackson Damasceno e Silva Elaine Aparecida de Souza Aloisio Sartorato and Cassius nonato de Souza Freire |
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| Institution: | Authors' addresses: Embrapa Meio-Norte, Avenue Duque de Caxias, 5650, 64006-220 Teresina, PI, Brazil;;Laboratório de Resistência de Plantas a Doenças e Genética Molecular, Departamento de Biologia, Universidade Federal de Lavras –UFLA, PO Box 37, 37200-000 Lavras, MG, Brazil;;Embrapa Arroz e Feijão, PO Box 179, Santo Antônio de Goiás, GO, Brazil (correspondence to Kaesel Jackson Damasceno e Silva. E-mail: ) |
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| Abstract: | The pathogenic variability was evaluated of 48 Pseudocercospora griseola isolates collected in the State of Minas Gerais, Brazil. Isolates were inoculated to a set of 12 international differential cultivars in a greenhouse. Ten pathotypes (55-15, 63-7, 63-15, 63-23, 63-25, 63-27, 63-31, 63-47, 63-55 and 63-63) were identified, showing the great pathogenic variability of this fungus in Minas Gerais State. Pathotypes 55-15, 63-15, 63-25 and 63-27 had not previously been reported in the State. Of the 48 isolates, all except pathotype 55-1547 induced a compatible reaction with all cultivars from the Andean group. Isolates were highly pathogenic in both Andean and Mesoamerican cultivars, thus being classified as Mesoamerican pathotypes. Pathotype 63-63 was the most widespread, and overcame the resistance genes present in all differential cultivars. |
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| Keywords: | Phaeoisariopsis griseola Pseudocercospora griseola Phaseolus vulgaris differential cultivars pathotypes Brazil |
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