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Objectif: la presente etude a pour objectif de caracteriser trente-six accessions de voandzou cultivees dans la Region de l’Extreme-Nord Cameroun afin d’evaluer leurs diversites sur le plan phenologique, morphologique et agronomique. Methodologie et resultats: l’essai a ete conduit suivant un dispositif en bloc de Fisher completement randomise, comprenant trente-six accessions de voandzou, repetees quatre fois. Les donnees sur les caracteres phenologiques, morphologiques et agronomiques ont ete analysees avec le logiciel GenStat 12 th edition et XLSTAT version 2013. Les resultats montrent d’importantes variations entre les accessions. Les variabilites les plus importantes sont observees avec le nombre de gousses (cv=37,08), le poids des gousses (cv=36,10) et le poids des graines (cv=37,01). Les variables les plus pertinentes regroupees en trois composantes principales (CP1, CP2 et CP3) expliquent pres de 75% les variations totales observees. Conclusion et application des resultats: il ressort de cette etude une forte heterogeneite observee au sein des accessions de voandzou : temps d’emergence (6 a 7 JAS), debut floraison (29 a 37 JAS), 50% floraison (33 a 42 JAS), poids des gousses (280,50 a 1447 kg/ha), et poids des graines (240,5 a 1066 kg/ha). Les correlations fortes et significatives observees entre le temps d’emergence des plantules et l’entree en floraison (r=0,664 ; p<0,01), l’entree en floraison et les 50% floraison (r=0,937; p<0,01) ; longueurs et largeurs des folioles principales (r=0,647; p<0,01) ; nombre de gousses et poids des gousses (r= 0,817 ; p<0,01) ; poids des gousses et poids des graines (r=0,945 ; p<0,01) suggerent une forte variabilite au sein de la collection. Les 10 accessions de la CP1 (Acc13, Acc1, Acc11, Acc6, Acc12, Acc38, Acc42, Acc24, Acc25, et Acc33) qui expliquent 31,88% la variabilite totale observee ; et les 13 accessions de la CP2 (Acc7, Acc37, Acc2, Acc17, Acc43, Acc14, Acc41, Acc9, Acc23, Acc36, Acc44, Acc19, et Acc31), qui expliquent 26,29% de variabilite totale observee s’avere interessantes. Elles constituent des  potentiels parents dont l’integration de leurs genotypes pourrait servir dans les programmes de selection varietale de voandzou. Mots cles: Voandzou, accession, morphotype, ecotype, Extreme-Nord Cameroun English Title: Agromorphological diversity of thirty-three landraces of Bambara groundnut [ Vigna subterranea (L.) Verdcourt] cultivated in the Far North Region of Cameroon English Abstract Objective: The objective of this study is to characterize thirty-six species of Bambara groundnut cultivated in the Far North Region of Cameroon to evaluate some of their phenological, morphological and agronomical diversity. Methodology and application of result: The experiment was conducted using a Fisher block dispositive which is a randomized complete block with thirty-six landraces replicated four times. The data concern phenological, morphological and agronomical characters which are being collected and analyzed using Genstat 12 edition and XLSTAT version 2013. The results show important variations among the landraces. The most important variability is observed with the number of pods (cv=37.08), pod yield (cv=36.10), and grains yield (cv=37.01). The most relevant variables are being grouped into three principal components (PC1, PC2 and PC3) which explain 75% of the total variations observed. Conclusion and application of results: High heterogeneity is being seeing concerning landraces of Bambara groundnut: number of days to emerge (6 - 7 DAS), number of days to flowering (29 - 37 DAS), 50% flowering (33 - 42 DAS), pod yield (280.50 to 1447 kg/ha), and grain yield (240.5 to 1066 kg/ha). Highly significant correlations were shown between number of days to emerge and flowering (r=0.664; p<0.01); beginning flowering and 50% flowering (r=0.937; p<001), leaf length and width (r=0.647; p<0.01), number of pods and pods weight (r=0.817; p<0.01), pods weight and grains weight (r=0.945; p<0.01), suggesting a high variability among the collection. The 10 landraces of the PC1 (Acc13, Acc1, Acc11, Acc6, Acc12, Acc38, Acc42, Acc24, Acc25, and Acc33) which explain 31,88% of the total variability observed; and the 13 landraces of the PC2 (Acc7, Acc37, Acc2, Acc17, Acc43, Acc14, Acc41, Acc9, Acc23, Acc36, Acc44, Acc19, et Acc31) which explain 26.29% of the total variability observed are reveal interesting. They constitute potentials parents while the integration of their genotypes perhaps can enhance improvement program of Bambara groundnut in selection. Keywords: Bambara groundnut, landraces, morphotype, ecotype, Far North Cameroon

journal of applied biosciences

Diversités agro morphologiques de trente-six accessions de voandzou [&lt;i&gt;Vigna subterranea&lt;/i&gt; (L.) Verdcourt] cultivées dans la région de l’Extrême-Nord Cameroun