<Emphasis Type="Italic">Pseudocercospora griseola</Emphasis> Causing Angular Leaf Spot on <Emphasis Type="Italic">Phaseolus vulgaris</Emphasis> Produces 1,8-Dihydroxynaphthalene-Melanin |
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| Authors: | Mario C N Saparrat Geraldine E Fermoselle Sebastián A Stenglein Mónica B Aulicino Pedro A Balatti |
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| Institution: | 1.Instituto de Fisiología Vegetal (INFIVE),Universidad Nacional de La Plata (UNLP)-CCT-La Plata-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET),La Plata,Argentina;2.Instituto de Botánica Spegazzini, Facultad de Ciencias Naturales y Museo,Universidad Nacional de La Plata,La Plata,Argentina;3.Cátedra de Microbiología Agrícola, Facultad de Ciencias Agrarias y Forestales,Universidad Nacional de La Plata,La Plata,Argentina;4.Laboratorio de Biología Funcional y Biotecnología (BIOLAB)-CEBB-CONICET, Facultad de Agronomía de Azul,UNCPBA,Azul,Argentina;5.Instituto Fitotécnico de Santa Catalina, Facultad de Ciencias Agrarias y Forestales,Universidad Nacional de La Plata,Buenos Aires,Argentina;6.Cátedra de Fitopatología-CIDEFI, Facultad de Ciencias Agrarias y Forestales,Universidad Nacional de La Plata,La Plata,Argentina |
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| Abstract: | Pseudocercospora griseola is the causal agent of angular leaf spot of common bean (ALS). It has undergone parallel coevolution with its host and two
major groups have been defined, “Andean” (P. griseola f. griseola) and “Mesoamerican” (P. griseola f. mesoamericana). The aim of this study was to analyze the nature and the level of the dark pigment synthesized by the representatives of
each group. After 21 days of incubation on potato dextrose agar medium, P. griseola f. griseola isolate S3b developed colonies with diameters of 17.5 ± 1.3 mm and concentric rings of pigmentation. Isolate T4 of P. griseola f. mesoamericana presented smaller colonies (9.9 ± 0.3 mm) with a uniform dark-gray color. Both isolates, S3b and T4, produced the same pigment,
a 1,8-dihydroxynaphthalene-melanin, although different in quantity and structural features as suggested by the IR spectrum.
The P. griseola f. griseola isolate S3b had a higher growth rate and melanin content as well as smaller sensitivity to melanin synthesis inhibitors compared
to the isolate T4 of P. griseola f. mesoamericana. These results suggest a possible link between melanin and growth in P. griseola. |
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| Keywords: | Melanin Pseudocercospora griseola Phytopathogen Fungus Dark pigment Angular leaf spot Phaseolus vulgaris “ Mesoamerican” group “ Andean” group Variability |
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