Phylogenetic relationships of coffee-tree species (Coffea L.) as inferred from ITS sequences of nuclear ribosomal DNA View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1997-06

AUTHORS

P. Lashermes, M. C. Combes, P. Trouslot, A. Charrier

ABSTRACT

Phylogenetic relationships of Coffea species were estimated from the sequences of the internal transcribed spacer (ITS 2) region of nuclear ribosomal DNA. The ITS 2 region of 37 accessions belonging to 26 Coffea taxa and to three Psilanthus species was directly sequenced from polymerase chain reaction (PCR)-amplified DNA fragments. The level of variation was high enough to make the ITS 2 a useful tool for phylogenetic reconstruction. However, an unusual level of intraspecific variation was observed leading to some difficulty in interpreting rDNA sequence divergences. Sequences were analysed using Wagner parsimony as well as the neighbour-joining distance method. Coffea taxa were divided into several major groups which present a strong geographical correspondence (i.e. Madagascar, East Africa, Central Africa and West Africa). This organisation is well supported by cytogenetic evidence. On the other hand, the results were in contradiction with the present classification of coffee-tree taxa into two genera, namely Coffea and Psilanthus. Furthermore, additivity of parental rDNA types was not observed in the allotetraploid species C. arabica. More... »

PAGES

947-955

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s001220050500

DOI

http://dx.doi.org/10.1007/s001220050500

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1028292636


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