Identification of Phaeoisariopsis griseola pathotypes from five States in Brazil

Due to the increased importance of angular leaf spot of common bean (Phaseolus vulgaris) in Brazil, monitoring the pathogenic variability of its causal agent (Phaeoisariopsis griseola) is the best strategy for a breeding program aimed at developing resistant genotypes. Fifty one isolates of P. griseola collected in five Brazilian States were tested on a set of 12 international differential cultivars in the greenhouse. When inoculated plants showed symptoms but no sporulation was observed, they were transferred to a moist chamber for approximately 20-24 h. After this period of time, if no sporulation was observed, the plants were considered resistant; otherwise, they were considered susceptible. From the fifty-one tested isolates, seven different pathotypes were identified. No Andean pathotypes were identified; consequently, all isolates were classified as Middle American pathotypes. Pathotype 63-31 was the most widespread. Pathotype 63-63 overcame resistance genes present in all differential cultivars and also the resistance gene(s) present in the cultivar AND 277. This fact has important implications for breeding angular leaf spot resistance in beans, and suggests that searching for new resistance genes to angular leaf spot must be pursued.

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Association Between Angular Leaf Spot (Phaeoisariopsis griseola (Sacc.) Ferraris) and Common Bean (Phaseolus vulgaris L.) Yield Loss at Jimma, Southwestern Ethiopia

Plant Pathology Journal ◽

10.3923/ppj.2011.57.65 ◽

2011 ◽

Vol 10 (2) ◽

pp. 57-65 ◽

Cited By ~ 4

Author(s):

Fikre Lemessa ◽

Waktole Sori ◽

Mulatu Wakjira

Keyword(s):

Phaseolus Vulgaris ◽

Common Bean ◽

Leaf Spot ◽

Yield Loss ◽

Angular Leaf Spot ◽

Phaseolus Vulgaris L ◽

Phaeoisariopsis Griseola ◽

Southwestern Ethiopia

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Identification of resistance sources of common bean (Phaseolus vulgaris L.) to angular leaf spot (Pseudocercospora griseola)

Revista Facultad Nacional de Agronomía Medellín ◽

10.15446/rfnam.v72n2.70238 ◽

2019 ◽

Vol 72 (2) ◽

pp. 8785-8791

Author(s):

Diego Rodríguez ◽

James Beaver ◽

Consuelo Estévez de Jensen ◽

Tim Porch

Keyword(s):

Puerto Rico ◽

Phaseolus Vulgaris ◽

Common Bean ◽

Resistance Genes ◽

Leaf Spot ◽

Angular Leaf Spot ◽

Gene Pools ◽

Phaseolus Vulgaris L ◽

Breeding Programs ◽

Pseudocercospora Griseola

Common bean (Phaseolus vulgaris L.) is the most important edible legume in the world and is an important source of income for farmers and food for millions of families. Angular Leaf Spot (ALS), caused by the fungus Pseudocercospora griseola (Sacc.) Ferraris, is one of the most important diseases in the production of common bean with the potential to cause significant seed yield losses. An effective and environmentally friendly alternative to control this disease is the use of improved varieties that combine resistance genes of Andean and Mesoamerican origin. In this study, the response of 181 bean genotypes (coming from different breeding programs of several countries including the USA, Puerto Rico, Honduras, Ecuador, Colombia, Tanzania, Malawi, and Angola) to two angular spot isolates (races 61:11 and 63:51, prevalent in Isabela and Juana Díaz, Puerto Rico) were evaluated. Many of these genotypes contained resistant genes to different biotic and to abiotic stress. A total of 16 lines were identified to have resistance to both races. The resistant lines include the Andean breeding lines CAL 143, 277 and the Mesoamerican cultivar ‘Ouro Negro’ that possess the resistance genes Phg-5, Phg-1, Phg-3, respectively. This information can help common bean breeding programs to pyramid genes from the Andean and Mesoamerican gene pools to generate varieties with long-lasting resistance to this disease.

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