Tetraclinis articulata
is an essence of great socio-economic value. The development of the resistance
and survival potential of this species to sometimes extreme environmental
conditions are a concern of the managers. for that, the present work is fixed
as an objective to evaluate the rate of mycorrhization of thuya roots and to
highlight the diversity of arbuscular mycorrhizal fungi (AMF) of thuya from two
sites (Beni Souhane and Aderj) of the region of Sefrou (Middle Eastern Atlas).
The results obtained showed that the thuya roots carry different structures of
endomycorrhizal fungi. The frequencies of mycorrhization of the roots are of
the order of 93.3% at the level of site Aderj and 80% at Beni Souhane. The
mycorrhizal root intensities are respectively 45.8% and 40% for the Beni
Souhane and Aderj sites. Moreover, the arbuscule contents are 26.05% in Beni
Souhane and 25.52% in Aderj. The vesicle contents are 14.89% in Aderj and
21.51% in Beni Souhane. The density of endomycorrhizal spores in the
rhizosphere of Thuya is 98 and 26 spores / 100 g of soil, respectively in Beni
Souhane and Aderj. The identification of isolated spores allowed to note the
presence of 37 species belonging to 7 genera, 7 families and 3 orders. The
genus Glomus is the most abundant, with a distribution percentage of 63.5%. The
species richness is 29 taxa in the site of Beni Souhane and 18 species at the
level of Aderj. Besides, the thuya of the Beni Souhane site shows a better rate
of mycorrhization of roots and a mycorrhizal species richness greater than that
of the Aderj site. This is reflected on the state of forest formation that is
coming well to Beni Souhane. It would, therefore, be valuable to develop
inocula from the endomycorrhizal fungi present in the Thuya rhizosphere and
proceed to controlled mycorrhization in nurseries to obtain resistant and
vigorous plants.
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