Arbuscular mycorrhizal fungi species associated with rhizosphere of Phoenix dactylifera L. in Morocco

A survey of arbuscular mycorrhizal fungi (AMF) diversity and date palm (Phoenix dactylifera L.) tree root colonization in arid areas was undertaken in ten palm groves located along the Ziz valley (Tafilalet, south-west Morocco). The frequency and the mean intensity of root colonization reached 72 and 43% respectively and the spore population varied from 238 to 1840 spores/10g of soil. The AMF colonization levels of field date palm roots were found to be negatively correlated with soil phosphorus content (r2 =-0,64). A total of ten AMF species were trapped from the 10 studied sites with a population of 4 to 7 species per sites. The isolated species included: Glomus mosseae, G. fasciculatum, G. constrictum, G. aggregatum, G. macrocarpum, 3 undescribed species of Acaulospora and two of Scutellospora genera. The latter two species were trapped only at the second trapping cycle.Keywords: AMF, diversity, Morocco, palm grove, Phoenix dactylifer,

Étude du pouvoir pathogène des isolats de Verticillium dahliae Kleb. issus de l'olivier (picholine marocaine) au Maroc

La picholine marocaine est la variété d’olivier la plus cultivée au Maroc. Elle occupe plus de 92% de la superficie oléicole. Malheureusement, elle s’est avérée sensible à la verticilliose. Une centaine d’isolats de Verticillium dahliae kleb. ont été collectés sur cette variété, dans différentes régions du Maroc. Parmi cette collection, 12 isolats ont été sélectionnés et testés pour l’analyse des pouvoirs pathogènes de Verticillium dahliae sur la variété picholine marocaine. Un continuum du degré de pathogénicité a été observé depuis les plus agressives jusqu’au moins agressives. Les isolats issus de la région Sud ont montré une grande variabilité du pouvoir pathogène. Les isolats 97, 153, 166 (issus des régions Nord) et l’isolat 210 (région du Sud) ont montré les degrés de pathogénicité les plus élevés

Full Length Research Paper - Arbuscular mycorrhizal fungi species associated with rhizosphere of Phoenix dactylifera L. in Morocco

A survey of arbuscular mycorrhizal fungi (AMF) diversity and date palm (Phoenix dactylifera L.) tree root colonization in arid areas was undertaken in ten palm groves located along the Ziz valley (Tafilalet, south-west Morocco). The frequency and the mean intensity of root colonization reached 72 and 43% respectively and the spore population varied from 238 to 1840 spores/10g of soil. The AMF colonization levels of field date palm roots were found to be negatively correlated with soil phosphorus content (r2 = -0,64). A total of ten AMF species were trapped from the 10 studied sites with a population of 4 to 7 species per sites. The isolated species included: Glomus mosseae, G. fasciculatum, G. constrictum, G. aggregatum, G. macrocarpum, 3 undescribed species of Acaulospora and two of Scutellospora genera . The latter two species were trapped only at the second trapping cycle