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Objectif: La presente etude a ete initiee dans l’objectif de favoriser l’utilisation des champignons mycorhizien dans le reboisement des essences locales. Methodologie et resultats: Pour y parvenir, des echantillonnages de racines et de sol ont ete realises sous des pieds de Fromager et de Makore du Jardin Botanique de Bingerville. Les spores ont ete isolees des echantillons de sols par tamisage humide et les racines, colorees avec le bleu trypan. Le potentiel infectieux (PIM) des sols a ete evalue par la methode du nombre le plus probable. Les resultats montrent que la densite de spores est plus grande sous le Makore. L’observation des racines atteste d’une mycorhization arbusculaire des deux especes d’arbres. La frequence de mycorhization des racines est superieure a 90 % pour les deux essences. S’agissant des proportions du cortex racinaire mycorhizee, elles ont ete de 48,30 ± 4,98 et de 31,20 ± 4,30 pour le Fromager et le Makore, respectivement. Aussi, les spores isolees appartiennent aux genres Scutellospora , Gigaspora , Acaulospora , et Glomus . Le PIM des sols est eleve pour les essences etudiees. Conclusion et application des resultats: Il ressort de cette etude que les essences etudiees admettent des symbioses endomycorhizienne et abritent dans leurs rhizospheres quatre genres de champignons MA. Les intensites de mycorhization montrent que le Fromager et le Makore tirent profit de cette association pour leur croissance. Au vu de ces resultats, la mycorhization pourrait etre utilisee pour faciliter la croissance de ces arbres. Aussi, les spores des CMA peuvent etre isolees et multipliees pour constituer un inoculum l’indigene. Mots cles: Ceiba pentandra , Thieghemella heckelii , champignons arbusculaire, potentiel mycorhizogene English Title: Evaluation of the mycorrhizal status of Ceiba pentandra and Tieghemella heckelii trees in the Bingerville Botanical Garden in Cote d'Ivoire English Abstract Objectives: This study was carry out aimpt for promoting the use of mycorrhizal fungi in the reforestation of local species. Methodology and Results: To achieve this, root and soil samples were taken under the trees Ceiba pentandra and Tieghemella heckelii from the Bingerville Botanical Garden. The spores were isolated from the soil samples by wet sieving and the roots, stained with trypan blue. Soil infectivity potential (MIP) was assessed by the most probable number method. The results show that the spore density is higher under T. heckelii. Observation of the roots shows that both tree species have arbuscular mycorrhization. The frequency of root mycorrhization is greater than 90% for both species. The proportion of the mycorrhized root cortex was 48.30 ± 4.98 and 31.20 ± 4.30 for Ceiba pentandra and Tieghemella heckelii , respectively. Also, isolated spores belong to the genus Scutellospora , Gigaspora , Acaulospora , and Glomus . The soil MIP is high for the species studied. Conclusions and application of findings: it appears from this study that the species studied admit endomycorrhizal symbioses and harbour four genera of AM fungi in their rhizospheres. The mycorrhization intensities show that Ceiba pentandra and Tieghemella heckelii benefit from this association for their growth. With these results, mycorrhization could be used to facilitate the growth of these trees. Also, CMA spores can be isolated and multiplied to form an indigenous inoculum. Keywords: Ceiba pentandra , Tieghemella heckelii , arbuscular mycorrhizal, mycorrhizal potential

journal of applied biosciences

Evaluation du statut mycorhizien d’arbres de &lt;i&gt;Ceiba pentandra&lt;/i&gt; (L), Gaertn et &lt;i&gt;Tieghemella heckelii&lt;/i&gt; (A.Chev), Pierre, du jardin Botanique de Bingerville en Côte d’Ivoire