Semester

Fall

Date of Graduation

1999

Document Type

Thesis

Degree Type

MS

College

Davis College of Agriculture, Natural Resources and Design

Department

Horticulture

Committee Chair

Joseph Morton.

Abstract

Relative effectiveness of ten species of arbuscular mycorrhizal fungi native to a revegetated coal strip mine site was tested on red clover against a non-mycorrhizal control and against inocula of two commercial isolates. Most (70%) of the isolated species in a native fungal community were as effective at promoting growth as commercial isolates. The net benefit of native colonizing fungi likely was positive, since the majority of the fungi colonizing two-year-old apple and grape in the field also were effective symbionts. The relationship between colonization and sporulation was compared among one Acaulospora , two Glomus, one Gigaspora, and one Scutellospora species on red clover. Threshold levels of colonization at which sporulation was initiated ranged from 10% ( G. etunicatum) to a maximum of 30% (Gi. gigantea, S. heterogama ).

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