Controls over mycorrhizal uptake of organic nitrogen

By J. M. Talbot, K. Treseder. 2010

139 citations recorded by the source corpus.

Abstract Mycorrhizal plants from a variety of ecosystems have the capacity to take up organic forms of nitrogen, yet the fraction of plant nitrogen demand met by organic N (ON) uptake remains unclear. ON uptake by mycorrhizal plants is a biochemical process that involves multiple steps, including breakdown and uptake of soil ON by mycorrhizal fungi, internal transformation of ON, and transfer of N to the host plant. We present hypothetical mechanisms controlling each of these steps and outline predictions for how these mechanisms structure patterns of ON uptake by mycorrhizal plants in ecosystems. Using a synthesis of published data, we found that uptake of amino acids by mycorrhizal fungi is related to the relative abundance, N content, and carbon structure of the amino acid. We hypothesize that the bond strength and structural diversity of soil ON controls the breakdown of polymeric ON by mycorrhizal fungi. In addition, the availability of carbon resources for the mycorrhizal fungus influences the capacity for mycorrhizal fungi to assimilate amino acids and produce extracellular enzymes that catalyze the breakdown of polymeric ON.

Subfields: Plant Science, Soil Science

View Paper: https://www.semanticscholar.org/paper/85cf9cb084939202033b88ac2bd1c4bc4020291f

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Plant Science

1. K. Peay
2. Bernard Henrissat
3. Francis Martin
4. T. Bruns
5. J. M. Talbot
6. Leho Tedersoo
7. Andy F. S. Taylor
8. A. Dahlberg

In Soil Science

1. K. Peay
2. Bernard Henrissat
3. A. Kohler
4. Francis Martin
5. T. Bruns
6. J. M. Talbot

Citations in the corpus

• Functional guild classification predicts the enzymatic role of fungi in litter and soil biogeochemistry (2015, background): “, 2009), can release a variety of extracellular enzymes in culture (Talbot and Treseder, 2010; Pritsch and Garbaye, 2011; Burke et al., 2014), and can acquire nutrients from complex soil organic matter in microcosms (Bending and Read, 1995a,b).”
• Independent roles of ectomycorrhizal and saprotrophic communities in soil organic matter decomposition (2013, background): “The genetic and/or physiological capability to produce enzymes that degrade N-rich or phenolic polymers appears to be distributed across a wide phylogenetic range of ECM taxa (Bödeker et al., 2009; Plett and Martin, 2011; Talbot and Treseder, 2010).”