Rose A. Meier

Publication Date


Document Type


First Advisor

Toth, Ronald

Degree Name

M.S. (Master of Science)

Legacy Department

Department of Biological Sciences


Triticum Aestivum L; Mycorrhizas; Glomus fasciculatum


Three parameters of the vesicular arbuscular mycorrhiza (VAM) formed between Glomus fasciculatum and roots of Triticum aestivum L. were quantified. These were: 1) the percentage of host cell occupied by fungus Vv (f,c), 2) the percentage of host cell occupied by host cytoplasm, Vy (cy,c), and 3) the ratio of surface area of the host protoplast to the volume of the whole host cell, Sv (pr,c). Penetration by the fungus caused the host protoplast to invaginate around the hyphae, thus increasing the Sv (pr,c) from 0.12/μm²/μm³ (in an uninfected cell) to 1.13 μm²/μm³ (average maximum of a mature arbuscule). Since the protoplast shrunk in volume upon infection, the Sv of the protoplast to its own volume is greater (2.62 μm²/μm³) than the Sv of the protoplast to the volume of the whole host cell. Arbuscular branch formation progressed slowly at first, but increased late in development as the arbuscule reached maturity (when branches occupied 20% of the host cell). Degeneration of branches also occurred rapidly after maturity of the arbuscule. At maximum, total fungus occupied 35% of the cell; 15% of that was trunk. Development and degeneration of the trunk progressed more linearly than that of the branches. The onset of arbuscule degeneration resulted in an initially sharp decline in all parameters studied.


Bibliography: pages 43-45.


vi, 57 pages,




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