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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Carbon and nitrogen balance in beech roots under competitive pressure of soil-borne microorganisms induced by girdling, drought and glucose application.
Funct. Plant Biol. 37, 879-889 (2010)
The goal of this work was to increase the understanding of factors regulating nitrogen (N) competition between roots and soil microbes. For this purpose, root assimilate supply was diminished or abolished in beech (Fagus sylvatica L.) seedlings by girdling, drought stress or a combination of both factors. This was revealed by C-13 tracer abundance in root tips after (CO2)-C-13 pulse labelling of the shoots. Analysis of different root tip fractions revealed that only 6% were ectomycorrhizal. Carbon (C) allocation to ectomycorrhizal and vital non-mycorrhizal root tips was similar to 26% higher than to distorted root tips. Drought resulted in similar to 30% increased ammonium (NH4+) and amino acid concentrations in roots and similar to 65% increased soil NH4+ concentrations, probably because of lower consumption of NH4+ by free-living microorganisms. Root uptake of glutamine of 13 nmol g(-1) fresh mass h(-1) decreased 2-fold with drought, although the number of vital root tips did not decrease. Carbon content in biomass of free-living microbes increased with glucose application regardless of drought, resulting in significant depletion in soil nitrate (NO3-), root NH4+ and amino acid concentrations. Our results suggest that the root-soil system of young beech trees was C-limited, and this prevented amino acid metabolism in roots and microbial NO3- consumption in the soil, thereby exerting feedback inhibition on uptake of inorganic N by roots. We suggest that rhizodeposition is a key link in regulating the plant-microbial N balance.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Competition; Ectomycorrhiza; Fagus sylvatica; Microorganisms; Root Demography; Stable isotopes
ISSN (print) / ISBN
1445-4408
e-ISSN
0310-7841
Zeitschrift
Functional Plant Biology
Quellenangaben
Band: 37,
Heft: 9,
Seiten: 879-889
Verlag
CSIRO PUBLISHING
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed
Institut(e)
Research Unit Environmental Simulation (EUS)