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A phenetic analysis of Colletotrichum gloeosporioides isolates from selected host plants

Authors:

PLT Gunawardhana ,

Department of Botany, University of Peradeniya, LK
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AMWK Senevirathna,

Rubber Research Institute, Darton Field, Agalawatta, LK
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NKB Adikaram,

Department of Botany, University of Peradeniya, LK
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DMD Yakandawala

Department of Botany, University of Peradeniya, LK
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Abstract

Colletotrichum gloeosporioides is a ubiquitous fungus which infects a wide variety of plants in tropical, sub-tropical and temperate regions. This fungus accounts for substantial economic losses through out the world via both preharvest and postharvest diseases. A phenetic analysis of C. gloeosporioides isolated from Capsicum frutescens, Carica papaya, Mangifera indica, Persea americana, Ficus religiosa and Hevea brasiliensis was carried out to identify sub-specific populations. A total of 40 isolates from these six host species were used. The overall similarity among different isolates of C. gloeosporioides was determined using culture, conidial and appressorial characteristics. According to the resulting phenogram, fungal isolates had divided into two distinct groups at the initial stage separating C. papaya isolates from the rest of the isolates. The subsequent branching has lead to separation of C. gloeosporioides isolates of different hosts into distinct groups. A high degree of similarity was observed among the isolates obtained from C. frutescens, H. brasiliensis and F. religiosa. Similarly, isolates of P. americana and M. indica appear to be morphologically more similar to each other. Further, the study confirms the cross infection potential of some C. gloeosporioides isolates and the presence of host specific populations

Key Words: anthracnose; phenetic analysis; cross inoculation

DOI: 10.4038/cjsbs.v38i2.1859

Cey. J. Sci. (Bio. Sci.) 38 (2): 57-66, 2009

DOI: http://doi.org/10.4038/cjsbs.v38i2.1859
How to Cite: Gunawardhana, P. et al., (2010). A phenetic analysis of Colletotrichum gloeosporioides isolates from selected host plants. Ceylon Journal of Science (Biological Sciences). 38(2), pp.57–66. DOI: http://doi.org/10.4038/cjsbs.v38i2.1859
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Published on 26 Apr 2010.
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