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Arbuscular mycorrhizas in phosphate-polluted soil:\ud interrelations between root colonization and nitrogen

By Verena Blanke, Markus Wagner, Carsten Renker, Hannelore Lippert, Manfred Michulitz, Arnd J. Kuhn and Francois Buscot


To investigate whether arbuscular mycorrhizal fungi (AMF) – abundant in a phosphate-polluted but nitrogen-poor field site – improve plant N nutrition, we carried out a two-factorial experiment, including N fertilization and fungicide treatment.\ud Percentage of root length colonized (% RLC) by AMF and tissue element concentrations were determined for four resident plant species. Furthermore, soil nutrient levels and N effects on aboveground biomass of individual species were measured. Nitrogen fertilization lowered % RLC by AMF of\ud Artemisia vulgaris L., Picris hieracioides L. and Poa compressa L., but not of Bromus japonicus Thunb. This – together with positive N addition effects on N status, N:P-ratio and aboveground biomass of most species – suggested that plants are mycorrhizal because of N deficiency. Fungicide treatment, which reduced % RLC in all species, resulted in lower N concentrations in A. vulgaris and P. hieracioides, a higher N concentration in P. compressa, and did not consistently affect N status of B. japonicus. Evidently, AMF had an influence on the N nutrition of plants in this P-rich soil; however – potentially due to differences in their mycorrhizal responsiveness – not all species seemed to benefit froma mycorrhiza-mediated N uptake and accordingly, N distribution

Topics: Botany, Agriculture and Soil Science, Biology and Microbiology, Ecology and Environment
Year: 2011
DOI identifier: 10.1007/s11104-011-0727-9
OAI identifier:

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