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Preliminary studies ofin vitro stimulation of sexual mating among isolates ofMycosphaerella fijiensis, causal agent of black sigatoka disease in bananas and plantains

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Abstract

Single-ascospore-derived isolates ofMycosphaerella fijiensis Morelet from false horn ‘Agbagba’ plantain leaves obtained from five different villages in southern Nigeria were stimulated to mate under artificial conditions. Pairs of isolates were incubated under blacklight on potato dextrose agar (PDA) with surface-sterilized plantain leaves or on PDA with autoclaved plantain leaves. Some isolates were observed to be sexually compatible by their ability to produce spherical to bulb-shaped fruiting body structures (FBS) and ascospores on pairing. FBS were observed to measure between 39–65 µm (smallest diameter) and 39–104 µm (largest diameter; mean 55.3×71.1 µm) in diameter, whereas ascospore lengths measured between 13.0 and 14.9 µm. Length of incubation time required for FBS production was dependent on the pair of isolates involved, the average being 40.1 days. With some pairs, ascospores were observed after 35 days of incubation.

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Authors and Affiliations

  1. Plant Pathology Unit, Dept. of Biological Sciences, Rivers State University of Science and Technology, Nkpolu, Port Harcourt, Rivers State, Nigeria

    Ebimieowei Etebu & Lloyd Ayibo Daniel-Kalio

  2. P.M.B. 633-6150, Santa Ana, Costa Rica

    Cornelia Pasberg-Gauhl

  3. Chiquita Brands International, San José, Costa Rica

    Friedhelm Gauhl

Authors
  1. Ebimieowei Etebu
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  2. Cornelia Pasberg-Gauhl
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  3. Friedhelm Gauhl
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  4. Lloyd Ayibo Daniel-Kalio
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Correspondence to Ebimieowei Etebu.

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http://www.phytoparasitica.org posting Dec. 16, 2002.

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Etebu, E., Pasberg-Gauhl, C., Gauhl, F. et al. Preliminary studies ofin vitro stimulation of sexual mating among isolates ofMycosphaerella fijiensis, causal agent of black sigatoka disease in bananas and plantains. Phytoparasitica 31, 69–75 (2003). https://doi.org/10.1007/BF02979768

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