Abstract
<i>B. costatum</i> is a local species of great socio-economique importance whose flowers are consummed and commercialized in local and regional market. Despite its economical and social value in local communities, it is still in the wild stand in the Guinean Savannah Highlands of Cameroon. The objective of the study is to contribute to its domestication by root segments cuttings. Root system of the mother trees was carefully excavated and the root samples (0.5−1kg) for the carbohydrate analysis were collected monthly throughout the year. In addition, a total of 180 root segments cuttings (RSC) were collected from 20 parent trees of different diameters at breast height (dbh) (15 - 30 cm; 30.1 - 45 cm and > 45 cm) in «Gamba» and «Karna manga». The experimental design explorated was a split - plot with 03 replicates. The trial was conducted in a non mist polypropagator. The results reveal that among the carbohydrates evaluated, fructose decreased from the dry to the rainy seasons while soluble and total sugars move in inverse order. The first buds appear 08 weeks after planting. At the end of the essay, the highest budding rate (81.11±19.65%) was obtained in root segments cuttings from Karna manga against 68.33±34.88% in RSC from mother trees of dbh 30.1-45 cm. Regarding the origin of root segments cuttings by dbh of parent trees interaction, the budding rate varied significantly from 36.66±5.77% in RSC from mother trees of dbh 15.1-30 cm originated from Gamba to 100±0% in those from parent trees of the same dbh in Karna manga (0.0046 < 0.01). The average height of leafy shoots varied from 8.28±5.23 cm in RSC from Gamba to 11.91±7.35 cm in those from Karna manga. The rooting rate fluctuated from 3.33±2.53% in root segments cuttings from mother trees of dbh 30.1 - 45 cm and dbh > 45 cm originated respectively from Gamba and Karna manga to 50±26.45% in those from parent trees of dbh 15 - 30 cm from Karna manga. These results will help to elaborate appropriate domestication and conservation strategies of the species.
Highlights
Bombax costatum, locally known as ‘’Djoye‘’ in peulh, is among the most socio-economic important tree species of the Guinean Savannah Highlands (GSH) of Adamawa in Cameroon [1, 2]
Root segments cuttings (RSC) used in the study were sampled in 20 genotypes from «Gamba» and «Karna manga» located in Guinean Savannah Highlands of Adamawa region
Root concentrations of carbohydrates clearly fluctuated the end of rainy season and lowest at the end of dry season under field conditions throughout the year, being highest at except for fructose
Summary
Locally known as ‘’Djoye‘’ in peulh, is among the most socio-economic important tree species of the Guinean Savannah Highlands (GSH) of Adamawa in Cameroon [1, 2]. Plants that bear edible Non Timber Forest Products are subjected to abuse by the operators They offer flowers and fruits that are regularly harvested and consumed or sold in local and regional markets [3]. In the agro-ecological conditions of the GSH of Cameroon, numerous works have been carried out on the propagation by root segments cuttings (RSC) of many species [13,14,15,16,17]. None of these works was focused in B. costatum. In addition to a test of this putative relationship, we wanted to profile the fluctuation of carbohydrates during the seasonal cycle of one year
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