Abstract
The effect of mycorrhizal infection on the response to mineral nitrogen was studied in Orchis morio L., Dactylorhiza praetermissa (Druce) Soó var. junialis (Vermln.) Sengh., Dactylorhiza majalis (Reichb.) Hunt & Summerh., and Dactylorhiza incarnata (L.) Soó, using two strains of Ceratorhiza sp. and two of Epulorhiza repens (Bernard) Moore as mycorrhizal symbionts. Both types of endophyte appeared to be able to stimulate orchid growth at relatively low nitrogen availability in the culture medium. The Ceratorhiza strains decreased nitrogen tolerance of associated orchid protocorms and had pronounced negative effects on the growth and survival of D. majalis and D. incarnata at high concentrations of ammonium nitrate. Such effects did not occur in symbioses involving the Epulorhiza strains. Within orchid species, differences were observed in the extent to which fungal strains stimulated growth. The Ceratorhiza isolates were incompatible with O. morio while the Epulorhiza strains were generally less efficient for Dactylorhiza spp. Key words: orchid mycorrhiza, nitrogen, Dactylorhiza spp., Orchis morio, Ceratorhiza spp., Epulorhiza repens.
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