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Kouam E. B., Avana-Tientcheu M. L., Lekeumo V. D., Akitio H. M., Khasa D. P., Pasquet Rémy. (2018). Agro-ecological distribution of the phenotypic diversity of aerial yam (Dioscorea bulbifera L.) in Cameroon using multivariate analysis : prospect for germplasm conservation and improvement. Open Agriculture, 3 (1), 190-206. ISSN 2391-9531

Fichier PDF disponiblehttp://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers18-12/010074472.pdf[ PDF Link ]

Lien direct chez l'éditeur doi:10.1515/opag-2018-0020

Titre
Agro-ecological distribution of the phenotypic diversity of aerial yam (Dioscorea bulbifera L.) in Cameroon using multivariate analysis : prospect for germplasm conservation and improvement
Année de publication2018
Type de documentArticle référencé dans le Web of Science WOS:000450372000003
AuteursKouam E. B., Avana-Tientcheu M. L., Lekeumo V. D., Akitio H. M., Khasa D. P., Pasquet Rémy.
SourceOpen Agriculture, 2018, 3 (1), p. 190-206. ISSN 2391-9531
RésuméAerial yam (Dioscorea bulbifera L.) is a crop of great economic importance and an excellent candidate for improving food security in developing countries. Understanding the genetic variability of any crop species is a decisive step for its improvement and requires characterization and evaluation of available germplasm. The objectives of this study were to determine the extent of genetic variability, estimate the association between agromorphological traits and clustering among 57 genotypes of aerial yam from three distinct agro-ecological zones in Cameroon using multivariate analysis. Thirty nine characters (23 qualitative and 16 quantitative) were used for the study. Significant differences in genetic diversity indices were found. Accessions from the bimodal humid forest zone (Na = 2.08, He = 0.27) showed significantly lower diversity compared to both western highland (Na = 2.30, He = 0.34) and humid monomodal forest zones (Na = 2.57, He = 0.32). Means values of most quantitative traits also showed significant differences between agro-ecological zones. Batingla-3 and Bawouwoua-1 had important bulbil yield, reaching 3500 g / plant. Significant associations were found between many traits. The use of the Unweighted Pair Group Method with Arithmetic Mean allowed the distribution of the 57 genotypes into six distinct clusters with the clustering pattern not showing any parallelism with location sites or agro-ecological zones. Mahalanobis D-2 statistics revealed the highest inter-cluster distance between cluster II and VI. Accessions of these clusters are potential parents for future breeding programs. This study showed that aerial yam from Cameroon has an enormous wealth of traits variation, indicating huge potential for its genetic improvement through selection and hybridization.
Plan de classementSciences du monde végétal [076]
Descr. géo.CAMEROUN
LocalisationFonds IRD [F B010074472]
Identifiant IRDfdi:010074472
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010074472

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