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Inoculation of olive plants with a composite endomycorrhizal inoculum showed a good installation of
mycorrhizal symbiosis on the inoculated plants. Root fresh weight, aerial weight, aerial height, stem
diameter and branch number were respectively 1066 and 950 g, 422.8 and 460 g, 103.8 and 102.4 cm,
3.06 and 2.52 cm, 57.2 and 59.6 for both of the mycorrhized Haouzia and Dahbia olive varieties
compared to control, 294 and 353 g, 62 and 101 g, 68 and 74.8 cm, 1.3 and 1.48 cm, 26.8 and 25.4. An
increase of growth ranged between 101 ± 466 cm for Dahbia and 92 ± 422.8 cm for Haouzia was
obtained with mycorrhizal inoculation.
Mycorrhizal intensity, arbuscular content, vesicular content and spores number of the mycorrhized
Dahbia and Haouzia plants were respectively 83.83 and 67.83%, 88 and 83.33%, 42 and 50%, 365.5 and
365.5 spores /100 g of soil, compared to control, 1.76 and 1.856%, 12.25 and 9.32%, 8.62 and 9.32%, 35
and 22 spores/ 100g of soil. 100% of roots of the inoculated plant varieties were mycorrhized and only
25% and 27% of the roots of the non inoculated Dahbia and Haouzia were naturelly mycorrhized.
Twenty three species of Vesicular-Arbuscular Mycorrhizae (VAM) were isolated from the rhizosphere of
the inoculated olive plants. The genus of Glomus was the dominant with a percentage of 52 %,
represented by twelve identified Glomus species and three non identified morphotypes. Six other different
genus were identified belonging to Scutellospora (1), Acaulospora (2), Gigaspora (2) and
Entrophospora(1).
Keywords: Olive tree, Vesicular-Arbuscular Mycorrhizae, mycorrhization, Morocco.