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Changes in ectomycorrhizal colonization and root peroxidase activity in Pinus sylvestris nursery seedlings planted in forest humus

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Plant biomass, root colonization by ectomycorrhizal (ECM) fungi and root peroxidase (POD) activity were monitored in Scots pine ( Pinus sylvestris L.) nursery seedlings during the first growing season after planting (after 4, 8 and 16 weeks, in July, August and October, respectively) in forest humus in outdoor open-top chambers with gaseous atmospheric pollutants (combinations of low levels of ozone, sulfur dioxide and nitrogen oxides). The number of ECM morphotypes as well as root biomass increased towards the end of the growing season, while root POD activity decreased. Fungal biomass estimated as ergosterol concentration peaked in August, 8 weeks after planting. The seedling growth, mycorrhizal status and POD activity in the roots were not affected by the gaseous pollutants.
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Keywords: Biomass allocation; POD; Scots pine; ectomycorrhiza; growing season; root peroxidase activity

Document Type: Research Article

Affiliations: 1: Muhos Research Station, Finnish Forest Research Institute, Kirkkosaarentie 7, FI-91500, Muhos, Finland 2: Department of Biology, University of Oulu, FI-90014, Oulun Yliopisto, Finland 3: Department of Mathematics, Natural and Computer Science, University College of Gävle, SE-801 76, Gävle, Sweden 4: Division of Biology, Kansas State University, 125 Ackert Hall, Manhattan, KS, 66506, U.S.A 5: Department of Ecological and Environmental Sciences, University of Helsinki, Niemenkatu 73, FI-15140, Lahti, Finland

Publication date: 2004-12-01

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