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Root infection by arbuscular mycorrhizal and other fungi in
response to elevated atmospheric carbon dioxide and
fertilization in a mediterranean annual grassland
POSTER
ALLEN, MICHAEL F.1, MATTHIAS C.
RILLIG1, JOHN N. KLIRONOMOS2, NONA R.
CHIARIELLO3 & CHRISTOPHER B. FIELD4
1Biology Department, San Diego State University,
San Diego, CA 92182, U.S.A.
2Department of Botany, University of Guelph,
Guelph, ON, Canada N1G 2W1
3Department of Biological Sciences, Stanford
University, Stanford, CA 94305, U.S.A.
4Department of Plant Biology, Carnegie
Institution of Washington, Stanford, CA 94305, U.S.A.
ICOM1 Abstract
In a 5 x 2 x 2 factorial experiment, 5 plant species of an
annual mediterranean grassland were grown for four months
in pots inside open-top chambers at the Jasper Ridge
Biological Preserve MECCA facility (San Mateo County,
California). The plant species consisted of three annual
grasses (Bromus hordeaceus, Vulpia microstachys var.
pauciflora, Avena barbata) and two herbs (Linanthus
parviflorus, and Calycadenia multiglandulosa). Per plant
species, four pots were used for each of the 4 treatment
combinations, in which atmospheric carbon dioxide
concentration (elevated and ambient) was crossed
factorially with NPK fertilization (fertilized and
unfertilized). Root infection by arbuscular mycorrhizal and
other fungi (e.g., melanized, clamped, regularly septate
hyphae) was assessed, and extraradical hyphal lengths were
measured.