Ability of native ectomycorrhizal fungi from northern Spain to colonize Douglas-fir and other introduced conifers

摘要

Thirty-six isolates from 27 species of native ectomycorrhizal fungi collected in northern Spain were tested for ectomycorrhiza formation withPseudotsuga menziesiiseedlings in pure culture syntheses. Thirteen of those species were also tested for ectomycorrhiza formation with six other species of conifers (two native and four introduced) to compare their colonization potential. Twenty-three fungal isolates from 18 species formed ectomycorrhizas withPseudotsuga menziesii. The colonization level of the root system varied markedly among the different fungal species. Eight fungi colonized over 50 of the short roots. Nine fungi did not form ectomycorrhizas even though some of them were collected in pure stands ofPseudotsuga menziesii.Laccaria laccata,Lyophyllum decastes,Pisolithus tinctorius, andScleroderma citrinumformed abundant ectomycorrhizas on all the conifers tested.Lactariusdeliciosus,Rhizopogonspp., andSuillus luteusshowed the greatest host specificity. The success in the introduction of some exotic conifers for reforestation in northern Spain is discussed in relation to their compatibility with native ectomycorrhizal fung