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[This article belongs to Volume - 57, Issue - 05]

Abstract : Despite the importance acquired by Casuarina in Algeria since their introduction at the beginning of the 19th century, the number of species now present in the country, their identity, their distribution as well as their symbiotic status are still largely unknown. Through this present study, we proposed to make a contribution to the knowledge of the symbiotic relationships of Casuarina equisetifolia (Forst) in the station of Ben Mhidi (wilaya of El Tarf). We first identified the Casuarina species present in the study station then we demonstrated root colonization by arbuscular endomycorrhizas and actinorhizas. Through a field study, we described stem nodulation in Casuarina equisetifolia and Casuarina cunninghamiana and concluded that there is a relationship between aerial nodules-Casuarina species-age of the plant-environmental conditions. The study of the biodiversity of Glomales spores has made it possible to describe more than twenty morphotypes, mainly belonging to the Glomus genus.