ARS | Publication request: MYCORRHIZAL SIMILARITIES OF SEPTATE FUNGAL ROOT ENDOPHYTES IN NATIVE PLANT SPECIES OF ARID ECOSYSTEMS

Submitted to: International Conference on Mycorrhizae Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: August 1, 1996
Publication Date: N/A

Technical Abstract: Levels of fungal colonization in the roots of fourwing saltbush Atriplex canescens and other dominant native grass and shrub species from an arid ecosystem have been studied. It was shown that colonization by septate fungal colonization was 2.7 times greater in fourwing saltbush than colonization by VAM fungi. Historically studies have focused on the role of VAM fungi and how they affect the plant. The septate fungi bear severa similarities to other types of mycorrhizae. They formed extensive non-dest ve interfaces, primarily by vegetative hyphae, within the root cortex. They enhance nutrient uptake at low concentrations and restrict uptake at high concentrations. They also protect against high salt concentrations. Some are competent decomposers and appear to enhance seedling vigor and establishment by supplying nutrients from external organic matter. They modify soil by binding sand particles to the root surface. We propose that septate fungal endophytes have a major function in ecosystem processes.