Record ID No. |
2088 |
Author(s) |
He X.H., Horwath W.R., Zasoski R.J., Aanderud Z., Bledsoe C.S , 2007 |
Affiliation |
University of California Davis, Department of Land Air & Water Resources, 1 Shields Ave, Davis,CA 95616 USA |
Title |
Nitrogen sink strength of ectomycorrhizal morphotypes of Quercus douglasii, Q-garryana, and Q-agrifolia seedlings grown in a northern California oak woodland |
Source. Vol.(no):Page |
Mycorrhiza.18(1):33-41p. |
Categories |
Ectomycorrhiza |
Subjects |
Biochemistry |
Sub-subjects |
Miscellaneous |
Organism |
n.a. |
Country |
United States |
Abstracts |
Little information is known on what the magnitude of nitrogen (N) processed by
ectomycorrhizal (ECM) fungal species in the field. In a common garden experiment performed in a
northern California oak woodland, we investigated transfer of nitrogen applied as (NH4)-N-15 or
(NO3)-N-15 from leaves to ectomycorrhizal roots of three oak species, Quercus agrifolia, Q.
Douglasii, and Q. Garryana. Oak seedlings formed five common ectomycorrhizal morphotypes on root
tips. Mycorrhizal tips were more enriched in N-15 than fine roots. N transfer was greater to the
less common morphotypes than to the more common types. N-15 transfer from leaves to roots was
greater when (NO3-)-N-15, not (NH4+)-N-15, was supplied. N-15 transfer to roots was greater in
seedlings of Q. Agrifolia than in Q. Douglasii and Q. Garryana. Differential N transfer to
ectomycorrhizal root tips suggests that ectomycorrhizal morphotypes can influence flows of N from
leaves to roots and that mycorrhizal diversity may influence the total N requirement of plants. |