Diversity and agromorphological patterns of cassava (Manihot esculenta Crantz) accessions cultivated in Gabons northern and northeastern regions

Describing the agromorphological traits of cassava varieties helps to identify high-yielding types or those best suited to specific farming systems and is essential for making informed varietal selection decisions. This study assessed the agromorphological diversity of cassava accessions from the Woleu-Ntem and Ogooué-Ivindo provinces of Gabon. Agronomic characterization of 212 accessions was carried out using 12 descriptors in a completely randomized design. Data analysis revealed high heterogeneity and substantial phenotypic variation. Hierarchical classification grouped the accessions into three distinct clusters, with an agglomeration coefficient of 0.995, indicating strong dissimilarity among the groups. Accessions in Group G1 allocated more biomass to aerial organs, whereas those in Group G3 favored root biomass, resulting in higher root yields. Group G2 exhibited an intermediate biomass allocation strategy. These contrasts in morpho-physiological traits suggest underlying genetic and environmental differences. This diversity is valuable for selecting cassava varieties with high yield potential or adaptation to specific cropping systems. Key words: Accessions, cassava, sustainable agriculture, varietal diversity, Africa.