The co-occurrence of ectomycorrhizal,arbuscular mycorrhizal,and dark septate fungi in seedlings of four members of the Pinaceae |
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Authors: | Cameron Wagg Michael Pautler Hugues B Massicotte R Larry Peterson |
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Institution: | (1) Department of Molecular and Cellular Biology, University of Guelph, Guelph, Ontario, N1G 2W1, Canada;(2) Ecosystem Science and Management Program, University of Northern British Columbia, 3333 University Way, Prince George, British Columbia, V2N 4Z9, Canada |
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Abstract: | Although roots of species in the Pinaceae are usually colonized by ectomycorrhizal (EM) fungi, there are increasing reports
of the presence of arbuscular mycorrhizal (AM) and dark septate endophytic (DSE) fungi in these species. The objective of
this study was to determine the colonization patterns in seedlings of three Pinus (pine) species (Pinus banksiana, Pinus strobus, Pinus contorta) and Picea glauca x Picea engelmannii (hybrid spruce) grown in soil collected from a disturbed forest site. Seedlings of all three pine species and hybrid spruce
became colonized by EM, AM, and DSE fungi. The dominant EM morphotype belonged to the E-strain category; limited colonization
by a Tuber sp. was found on roots of Pinus strobus and an unknown morphotype (cf. Suillus–Rhizopogon group) with thick, cottony white mycelium was present on short roots of all species. The three fungal categories tended to
occupy different niches in a single root system. No correlation was found between the percent root colonized by EM and percent
colonization by either AM or DSE, although there was a positive correlation between percent root length colonized by AM and
DSE. Hyphae and vesicles were the only AM intracellular structures found in roots of all species; arbuscules were not observed
in any roots. |
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Keywords: | Conifers Symbiosis Fungal endophytes Mycorrhiza |
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