Mycorrhizal diversity and root colonization potential of agricultural soils – Doukkala, Morocco

Abstract Underarid and semi-arid ecosystems where drought, soil salinity and low soil fertility considerably limit crop production. Under such stressful growing conditions, an appropriate management of mycorrhizae may have a determinant impact on plant production, on the improvement of soil quality and the diversification of cultivated crops. In this context, the diversity of the arbuscularmycorrhizae flora in semi-arid agricultural soils of OuledGhanem and SidiBennour sites of the Doukkala region, Morocco was evaluated and the impact of soil physico-chemical factors on their root-colonization potential studied. The two selected studied sites are respectively characterised by neutral to alkaline substrates, low level of organic matter but differed in their respective texture, sandy soil and muddy soil and their low to medium available P contents. The comparative analysis of the arbuscular mycorrhizal flora reveals a certain amount of shared species and is characterized in sandy soils by a good proportion of Diversisporales: Scutellosporacalospora, Acaulosporacavernata, Entrophosporainfrequens, Gigaspora margarita when the muddy soils are inhabited with a majority of Glomerales (Glomus.sp). Correlation between physico-chemical and biological soil data enlighted the negative impact of alkalinity and available phosphorus on the soil root colonization potential. The comparative data analyses bring in a critical look at the possible interaction between fungal diversity, mycotrophic plant and root colonization.

Keywords Arbuscular, mycorrhiza,biodiversity, Glomeromycetes, mycotrophic.

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Mycorrhizal diversity and root colonization potential of agricultural soils

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