Mycosphaerella leaf spot diseases of bananas - CBS

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Session 2 C. Molina et al. Fischer D. and K. Bachmann. 1998. Microsatellite enrichment in organisms with large genomes (Allium cepa). Biotechniques 24:796–802. Groppe K. and T. Boller. 1997. PCR assay based on a microsatellite-containing locus for detection and quantification of Epichloe endophytes in grass tissue. Applied and Environmental Microbiology 63:1543-1550. Leach R. 1941. Banana leaf spot, Mycosphaerella musicola, the perfect stage of Cercospora musae Zimm. Tropical Agriculture 18:91-95 Leach R. 1964. A new form of banana leaf spot in Fiji, black leaf streak. Wild Crops 16:60-64. Molina C., D. Kaemmer, S. Aponte, K. Weising and G. Kahl. 2001. Microsatellite markers for the fungal banana pathogen Mycosphaerella musicola. Molecular Ecology Notes 1:137-139. Mourichon X., J. Carlier and E. Fouré. 1997. Sigatoka Leaf Spot Diseases. INIBAP Musa disease fact sheet No.8. 4pp. Müller R., C. Pasberg-Gauhl, F. Gauhl, J. Ramser and G. Kahl. 1997. Oligonucleotide fingerprinting detects genetic variability at different levels in Nigerian Mycosphaerella fijiensis. Journal of Phytopathology 145:25-30. Neu C., D. Kaemmer, G. Kahl, D. Fischer and K. Weising. 1999. Polymorphic microsatellite markers for the banana pathogen Mycosphaerella fijiensis. Molecular Ecology 8:523–525. Price N. 1999. Highland Bananas in Colombia. INFOMUSA 8(2):26-28. Rohlf J. 1993. Numerical Taxonomy and Multivariate Analysis System. Version 1.8. Rozen S. and H.J. Skaletsky. 1997. Primer3. Available at http://www-genome.wi.mit.edu/ genome_software/other/primer3.html. Sambrook J., E.F. Fritsch and T. Maniatis. 1989. Molecular Cloning: a Laboratory Manual. 2 nd Edition. Cold Spring Harbor Laboratory Press, New York. Stover R.H. 1976. Distribution and cultural characteristics of the pathogens causing banana leaf spot. Tropical Agriculture 53:111-115. Unión de Países Exportadores de Banano (UPEB). 1994. The main lines of the banana industry in Latin America. INFOMUSA 5(1):14-19. Weising K.B. Beyermann, J. Ramser and G. Kahl. 1991. Plant DNA fingerprinting with radioactive and digoxigenated oligonucleotide probes complementary to simple repetitive DNA sequences. Electrophoresis 12:159–169. 139
Session 2 L. Conde-Ferráez et al. Poster An electrophoretic karyotype for Mycosphaerella fijiensis L. Conde-Ferráez,C.M.Rodríguez, L. Peraza-Echeverría and A. James Abstract In view of the current problems caused by black leaf streak disease in banana production, a knowledge and understanding of the genetics and organization of the genome of Mycosphaerella fijiensis could lead to the development of new control strategies. Regarding the former, mycelium was obtained from isolates of M. fijiensis from three sites in Mexico (Veracruz, Colima and Chiapas) in order to estimate the size of the genome by using the CHEF (Contour clamped Homogeneous Electric Field) system. Different conditions of pulse field electrophoresis enabled the separation of M. fijiensis chromosomes and a preliminary estimate of the karyotype of each isolate was obtained. Isolates from Colima and Chiapas had bands corresponding to at least 10 chromosomes in the size range 0.71 to 2.2 Mb. The Veracruz isolate had at least 14 chromosomes in a size range of 0.67 to 5.6 Mb. Genome size calculated for the Veracruz isolate was at least 28 Mb, which is comparable to that of some ascomycete fungi. Attempts were made to estimate the genome size of the Colima and Veracruz isolates. Differences in the principal band suggested the presence of polymorphisms in chromosome length between the isolates studied, as reported for other species of fungi. Resumen - Cariotipo molecular de Mycosphaerella fijiensis Ante la problemática actual ocasionada por la Sigatoka negra en la producción de banano, el conocimiento y la comprensión de la genética y la organización del genoma de Mycosphaerella fijiensis podrían conducir al desarrollo de nuevas estrategias para su control. Considerando lo anterior, se propuso obtener el cariotipo molecular de tres aislados de M. fijiensis por medio del sistema CHEF (Contour clamped Homogeneous Electric Field), así como estimar su tamaño genómico. Para ello, se utilizó el micelio de aislados procedentes de tres diferentes lugares de México (Veracruz, Colima y Chiapas). Se ensayaron diferentes condiciones de electroforesis de campo pulsante que permitieron separar los cromosomas de M. fijiensis. Se obtuvo una estimación preliminar del cariotipo de cada aislado. En los aislados de Colima y Chiapas se observaron bandas correspondientes a por lo menos 10 cromosomas, en un rango de tamaño entre 0.71 y 2.2 Mb. En Centro de Investigación Científica de Yucatán, Mérida, México. 141
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Contents Foreword . . . . . . . . .
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Foreword The rapid expansion in the
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Introduction to workshop Overview o
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Introduction to workshop X. Mourich
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Session 1 Impact of Mycosphaerella
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List of participants Catherine Abad
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List of participants Friedhelm Gauh
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List of participants Xavier Mourich
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List of participants Moises Soto Ba
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