A seedborne septate fungus (Aspergillus sp.) formed intimate nondestructive interfaces with seedling radicles of germinating fourwing saltbush (Atriplex canescens [Pursh] Nutt.) seedlings. When seedlings were separated from insoluble phosphorus sources with a screen that excluded roots but allowed passage of extraradicle hyphae, which accessed plant insoluble phosphate and transported it through the barrier to the plant. The fungi enhanced phosphorus uptake, biomass production of the host plants and aggregated sand similar to functions attributed to mycorrhizal fungi. The importance of symbiotic fungi in the remediation and stabilization of arid ecosystems is discussed.

Fort Collins, CO