Influence du génotype et du nombre de feuilles sur la croissance en pépinière des boutures du colatier (<i>Cola nitida</i> [Vent.] Schott et Endlicher.)

Abstract

Malgré son importance socioéconomique, la production ivoirienne de noix de cola est confrontée à plusieurs difficultés. Le manque de techniques culturales éprouvées constitue une des contraintes pour la domestication et la culture du colatier. Il est donc nécessaire de mettre au point des techniques adaptées à l’espèce cultivée. L’objectif de cette étude est d’optimiser la méthode de bouturage sous tunnel du colatier (Cola nitida), face aux inconvénients de la multiplication générative. Le dispositif expérimental utilisé est un Split-Splot avec deux facteurs : le génotype avec cinq modalités (5 génotypes) et le nombre de feuilles avec cinq (05) modalités (1, 2, 3, 4 et 5 feuilles diminuées de moitié). Nous avons le génotype en grande parcelle et le nombre de feuilles en petite parcelle. L’aptitude des génotypes au bouturage a été évaluée à six mois à travers le taux de survie et la mesure des paramètres de croissance et de développement. Le génotype L18A1D9 a montré la meilleure aptitude au bouturage avec un taux de survie de 41,7%. Les boutures avec 4 feuilles diminuées de moitié ont eu le meilleur taux de survie (41,7%), un bon enracinement des boutures vivantes (88,9%), une biomasse totale fraîche (4,2 g) et totale sèche (1,7 g) élevée. Le succès du bouturage sous tunnel du colatier est tributaire du génotype et du nombre de feuilles. Le nombre de feuilles recommandé par bouture est de quatre (4) pour le bouturage du colatier sous tunnel.Mot clés : Bouturage, nombre de feuilles, Cola nitida, génotype. Englsih Title: Influence of genotype and number of leaves on the growth in nurseries of cola cuttings (Cola nitida [Wind.] Schott and Endlicher.)Despite its socio-economic importance, kola nut production faces several challenges. Domestication and cultivation of kola requires the adoption of propagation techniques adapted to the crop species. The objective of this study is to optimize kola (Cola nitida) vegetative propagation by cutting under tunnel. The experimental design used was a split-splot with two factors: genotype with five modalities (5 genotypes,) and leave number with five (05) modalities (1, 2, 3, 4 and 5 leaves cut in half). The ability of genotype to cutting propagation was assessed by measuring growth parameters. The survival rate of the cuttings was evaluated at six months. Root growth, number of new leaves, height gain and biomass were subsequently measured. Genotype L18A1D9 has the best ability for vegetative propagation by cuttings with a survival rate of 41.7%. To optimize vegetative propagation by cuttings under tunnel, 4 leaves cut in half by cuttings must be used for acceptable success rate (41.7%), good rooting (88.9%), a high total fresh biomass (4.2 g) and total biomass (1.7g). The success of kola vegetative propagation depends of genotype and the leave number per cutting. The number of leaves per cuttings recommended per cuttings is four (4) for kola vegetative propagation.Keywords: Cuttings, number of leaves, Cola nitida, genotype.

Vegetative propagation of cocoa (Theobroma cacao) by grafting: Aptitude of grafting on four clones

“…These findings line up with those of Essola et al (2017) who reported a mean survival of 45 and 52.57% for cuttings of SNK16 and T79/501 respectively. Similarly, Kamga et al (2018) obtained a 60% survival rate with hybrid cocoa cuttings, whereas Séry et al (2019) reported a 41.7% survival rate with Cola nitida cuttings. From the 4320 grafted plants established in this experiment, 4039 grafted plants were recorded after data cleaning and 3285 (81%) survived at the first week of measurement and then decreased to 1794 (44,4%) at the fourth week data collection.…”

Study of the effect of indole-3-butyric acid (IBA) on the rooting of kola tree cuttings (Cola nitida [Vent.] Schott and Endlicher.)

“…These factors are, among others, the genotype, the number of leaves, the type of substrate, the length of the cuttings, the type of branch, the number and position of nodes as well as the concentration of plant hormones . In addition, the survival and rooting rates obtained from kola tree cuttings were relatively low (Sery et al, 2019). It is therefore necessary to propose methods to accelerate the growth and root development of kola tree cuttings.…”

Mini-review on the phyto-chemistry, pharmacology and toxicology of <i>Cola nitida</i> (Vent.) Schott & Endl. (Malvaceae): A medically interesting bio-resource of multiple purposes in Africa

“…This genus is well-known for its medicinal benefits as well as for its many uses throughout Africa (Ouattara et al, 2018;Sery et al, 2019). It contains several species, but only two are cultivated for their scientific and economic values.…”