Does resource exchange in ectomycorrhizal symbiosis vary with competitive context and nitrogen addition?

Bogar, Laura M.; Tavasieff, Oceana S.; Raab, Ted K.; Peay, Kabir G.

doi:10.1111/nph.17871

Does resource exchange in ectomycorrhizal symbiosis vary with competitive context and nitrogen addition?

Journal Article · Fri Nov 19 04:00:00 EST 2021 · New Phytologist

DOI:https://doi.org/10.1111/nph.17871· OSTI ID:1844252

^[1]; Tavasieff, Oceana S. ^[2]; ^[3]; ^[4]

Univ. of California, Santa Barbara, CA (United States); Stanford University
Univ. of California, Santa Barbara, CA (United States)
Carnegie Institution for Science, Stanford, CA (United States)
Stanford Univ., CA (United States)

Ectomycorrhizal symbiosis is essential for the nutrition of most temperate forest trees and helps regulate the movement of carbon and nitrogen through forested ecosystems. The factors governing the exchange of plant carbon for fungal nitrogen, however, remain obscure. Because competition and soil resources may influence ectomycorrhizal resource movement, we performed a ten month split-root microcosm study using Pinus muricata seedlings with Thelephora terrestris, Suillus pungens, or no ectomycorrhizal fungus, under two nitrogen levels in artificial soil. Fungi competed directly with roots, and indirectly with each other. We used stable isotope enrichment to track plant photosynthate and fungal nitrogen. For Thelephora, plants received N commensurate with the C given to their fungal partners. Thelephora was a superior mutualist under high nitrogen. For Suillus, plant C and fungal N exchange were not coupled. However, in low nitrogen, plants preferentially allocated C to Suillus rather than Thelephora. Our results suggest that ectomycorrhizal resource transfer depends on competitive and nutritional context. Plants can exchange C for fungal N, but coupling of these resources can depend on the fungal species and soil N. Here, understanding the diversity of fungal strategies, and how they change with environmental context, reveals mechanisms driving this important symbiosis.

View Accepted Manuscript (DOE)

Research Organization:: Stanford Univ., CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0016097

OSTI ID:: 1844252

Alternate ID(s):: OSTI ID: 1834444

Journal Information:: New Phytologist, Journal Name: New Phytologist Journal Issue: 3 Vol. 233; ISSN 0028-646X

Publisher:: WileyCopyright Statement

Country of Publication:: United States

Language:: English

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