» qui à travers son projet « AFTP4A » a soutenu financièrement les travaux de recherche. RESUME A Kisangani, le kolatier, Cola acuminata est utilisé à des fins thérapeutiques et sociales et procure des revenus non négligeables aux personnes impliquées dans sa filière. Les produits de kolatier (noix, écorce, feuille) sont obtenus par des récoltes en forêt qui est pourtant menacée. Sa domestication est une nécessité. La présente étude avait pour objet de déterminer le diamètre et l'orientation des branches pour la multiplication végétative de kolatier. La technique de marcottage aérien a été utilisée. Trois classes de diamètre (2,0-2,9 ; 3,0-3,9 et 4,0-4,9 cm) et deux orientations (plagiotrope et orthotrope) des branches ont été investiguées pour leurs effets sur l'enracinement. Les résultats ont montré que les racines apparaissent à partir de la 6 e semaine après la pose des marcottes. Des taux d'enracinement de 82,2 ± 5,7% et 75,5 ± 6,4% ont été obtenus avec les branches orthotropes et plagiotropes respectivement. Les différentes classes de diamètre de branches ont donné 76,7 ± 7,8% ; 63,3 ± 8,9% et 43,3 ± 9,2% pour 4,0-4,9 cm ; 3,0-3,9 cm et 2,0-2,9 cm respectivement. Ces résultats indiquent que C. acuminata répond bien à la technique de marcottage, et que les branches orthotropes de diamètre compris entre 4 et 4,9 cm sont bien indiquées pour un enracinement meilleur des marcottes. La technique de marcottage peut de ce fait être utilisée pour la multiplication conforme des individus élites chez cette espèce.
particular. The people involved in its sector (producers, traders) earn a significant income. The kola nuts, appreciated in the country, are mostly taken from the trees in the forest which are currently threatened by the anthropic activities. It would therefore be desirable to preserve this species in the environment by domestication. For this purpose, this study aims at the multiplication of C. acuminata by cuttings. Methodology and results: Substrate type factors, leaf area, stem length of cuttings and the Idol Butyric Acid (IBA) auxin were experimented. The substrates used are river sand, sawdust, rice husks and their combinations in pairs. The leaf surfaces 25 and 37.5cm² and the stems lengths 3; 5 and 7 cm were compared. Two tests were carried out, the first testing the substrates types in a monofactorial device in randomized complete block, the other factors conducted, in the second trial, in a tri-factorial device, split plot. The sand substrate allowed more of cuttings rooted (81.11 ± 11.67%). The combinations lengths of cuttings 7cm with leaf area 37,5cm²-AIB auxin and leaf area 25cm²-without AIB auxin are better, 70% of rooted cuttings. Conclusion and application of results: The species C. acuminata adapts well to the technique of vegetative propagation by cuttings. Up to 81% of cuttings were rooted. The substrate type factor greatly affects the rooting rate. The other factors did not significantly influence this parameter. Since the cuttings were rooted, subsequent work should focus on in situ monitoring of the growth and development of rooted cuttings. By this technique, it is possible to obtain sufficient seedlings, to be made available to producers, for the domestication of Cola acuminata.
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