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Experimental study of establishment of ectomycorrhizas in different regions of birch root systems

Experimental study of establishment of ectomycorrhizas in different regions of birch root systems

Transactions of the British Mycological Society 91(2): 239-252

Mycelial inocula of ectomycorrhizal fungi were added to 2-yr old saplings of birch (Betula pendula) transplanted, with washed roots, from colliery spoil to brown earth soil in troughs in a glasshouse. Lactarius pubescens infected only in older regions of the root systems whereas Hebeloma crustuliniforme (and some Hebeloma spp., from air-borne spores) developed mycorrhizas in all root regions. Mycorrhizas of Thelephora terrestris, Inocybe sp., Paxillus involutus, Laccaria sp., Cenococcum sp. and Leccinum sp. developed from air-borne spores or (P. involutus) from inoculum originally on the sapling roots. Their distributions differed along the root systems. Fruit bodies of T. terrestris, Inocybe lacera and H. crustuliniforme showed different distribution within and between years, indicative of a fruit body succession. Periodic inspection of the lower soil surface revealed an increase in occurrence of Hebeloma mycorrhizas with time, but root regions heavily infected by Hebeloma spp. at the end of the second season were also heavily infected after the third season. The results confirm previously reported developmental sequences of mycorrhizas. and suggest that mycorrhizal fungi differ in ability to infect root tips from inoculum in soil, depending on the age of the subtending root region.

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Accession: 001832016

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DOI: 10.1016/s0007-1536(88)80211-0

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