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Morphological characterization of the national cassava Manihot esculenta Crantz collection in Côte d'Ivoire

N'Zue B., Sangaré A., Letourmy P., Zohouri P.G., Vernier P.. 2009. African Journal of Root and Tuber Crops, 7 (1) : p. 32-38.

The collection of cassava (Manihot esculenta Crantz) in Côte d'Ivoire is composed of local and introduced varieties from various origins. A study concerning its morphological characterization was carried out from 2001 to 2002 at the CNRA's (Centre national de recherche agronomique) research station at Bouaké. It is based on 14 aerial and belowground qualitative descriptors applied to 340 accessions. Descriptors were recorded between 5 and 12 months after planting. Statistical analyses of data (multiple correspondences analysis, Aggregative hierarchical clustering, etc.), grouped the accessions into 8 homogenous classes. Class 1, 99(41)1 type, is composed of many improved varieties (68 %) while class 6, "Bonoua rouge" type, and class 7, CB type, each contains at least 80 % of traditional cultivars. All the clones with yellow flesh were assigned to class 2, "Agba bana" group. Some features, such as yellow flesh and white root skin have rarely been observed. Duplicate accessions account for 25 % of the germplasm. Therefore, the number of accessions could be reduced to 285 morphotypes.

Mots-clés : manihot esculenta; côte d'ivoire

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