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Annals of Botany 92: 709-714, 2003
© 2003 Annals of Botany Company

Genome Size Variations in Diploid African Coffea Species

M. NOIROT*,1, V. PONCET1, P. BARRE2, P. HAMON1, S. HAMON1 and A. DE KOCHKO1

1 IRD, BP 64501, 34394 Montpellier Cedex 5, France and 2 INRA-SAPF, 86600 Lusignan, France

* For correspondence. E-mail noirot{at}mpl.ird.fr

Received: 7 November 2002;; Returned for revision: 21 May 2003. Accepted: 3 July 2003

Flow cytometry was conducted to evaluate genome size diversity among African diploid species of the Coffea genus. The study included 15 species and six new taxa from Congolese and Cameroonian forest regions which have yet to be botanically characterized. Between-population differences were also recorded in some cases. These evaluations using an internal standard were highly correlated with previous results obtained with an external standard, but differences of up to 18 % existed for some species, involving stoichiometric errors. Consequently, genome size variation between species and within species are discussed as true genome size differences or stoichiometric errors. Environmental and phenotypic correlations with genome size are also discussed.

Key words: Coffea, genome size, flow cytometry, interspecific diversity, intraspecific diversity.


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