Details

Autor(en) / Beteiligte

• Blanke, Verena
• Renker, Carsten
• Wagner, Markus
• Füllner, Kerstin
• Held, Matthias
• Kuhn, Arnd J.
• Buscot, François

Titel

Nitrogen supply affects arbuscular mycorrhizal colonization of Artemisia vulgaris in a phosphate-polluted field site

Ist Teil von

• The New phytologist, 2005-06, Vol.166 (3), p.981-992

Ort / Verlag

Oxford, UK: Blackwell Science

Erscheinungsjahr

2005

Quelle

Wiley Online Library - AutoHoldings Journals

Beschreibungen/Notizen

• $\bullet$ Root colonization by arbuscular mycorrhizal fungi (AMF) was investigated in industrially polluted grassland characterized by exceptionally high phosphorus levels (up to $120 g kg^{-1}$ soil). $\bullet$ Along a pollution-induced nitrogen gradient, soil and tissue element concentrations of Artemisia vulgaris plants and their mycorrhizal status were determined. Additionally, we compared mycorrhization rates and above-ground biomass of A. vulgaris at N-fertilized and control plots in the N-poor area. $\bullet$ Despite high soil and tissue P concentrations, plants from N-deficient plots, which were characterized by low tissue N concentrations and N : P ratios, were strongly colonized by AMF, whereas at a plot with comparable P levels, but higher soil and plant N concentrations and N : P ratios, mycorrhization rates were significantly lower. Correlation analyses revealed a negative relationship between percentage root colonization of A. vulgaris by AMF and both tissue N concentration and N : P ratio. Accordingly, in the fertilization experiment, control plants had higher mycorrhization rates than N-fertilized plants, whereas the species attained higher biomass at N-fertilized plots. $\bullet$ The results suggest that N deficiency stimulates root colonization by AMF in this extraordinarily P-rich field site.