Diversity of native endomycorrhizal fungi in selected strawberry field soils of southern Quebec

摘要

Prolific sporulation exhibited by some indigenous endomycorrhizal fungus species in agricultural field soils is not necessarily synonymous with effective plant root colonization. To determine whether proliferating fungus species found in field soilsare the species actually colonizing host plant roots, arbuscular mycorrhizal fungi (AMF) were collected and identified from strawberry field soils and in root-initiated greenhouse trap cultures of sorghum and strawberry. The composition of AM fungus species from strawberry field soils did not perfectly match the fungus populations recovered from the root-initiated successive trap cultures. The study detected ten AM fungus species, half of which were found in trap cultures but not in the field soil samples. AMF species displayed different sporulation patterns with varying spore densities depending on the sample sites, the number of trap culture cycles, and the bait host plant. Glomus mosseae and G. macrocarpum were detected at two of the three samplingsites, across all of the trap cultures, regardless of the test plant involved. G. constrictum and Sclerocystis rubiformis were detected initially in the strawberry field soils, but could not be recovered throughout successive bait cultures. The study emphasizes both the merits and the limits of spores as a tool for AM species detection.