tailieunhanh - Báo cáo khoa học: "Mycorrhization helper bacteria associated with the Douglas fir-Laccaria laccata symbiosis: effects in aseptic and in glasshouse conditions"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Mycorrhization helper bacteria associated with the Douglas fir-Laccaria laccata symbiosis: effects in aseptic and in glasshouse conditions. | Ann Sci For 1991 48 239-251 Elsevier INRA 239 Original article Mycorrhization helper bacteria associated with the Douglas fir-Laccaria laccata symbiosis effects in aseptic and in glasshouse conditions R Duponnois 1. J Garbaye 2 1BIOSEM Laboratoire de Technologie des Semences Avenue du Bois de l Abbe F-49070 Beaucouze 2INRA Centre de Recherches Forestieres de Nancy Champenoux F-54280 Seichamps France Received 8 October 1990 accepted 19 December 1990 Summary A range of bacterial isolates from Laccaria laccata mycorrhizas and sporocarps were tested for their effect on ectomycorrhizal development of Douglas fir with L laccata. The experiments were carried out in aseptic conditions and in the glasshouse under summer and winter conditions. Fourteen isolates increased mycorrhizal development after 16 wk of growth in the summer experiment. Seven bacterial isolates displayed a significant stimulating effect in the winter experiment. All bacterial isolates tested under aseptic conditions displayed a significant stimulating effect. In the winter experiment the treatments without L laccata inoculation were contaminated by Thelephora ter-restris ectomycorrhizal basidiomycete a natural contaminant in the glasshouse Six bacterial isolates displayed a significant inhibiting effect towards ectomycorrhizal infection by T terrestris Three isolates enhanced the ectomycorrhizal development of Douglas fir with L laccata in all experiments. It is confirmed that the inoculation techniques in forest nurseries could be improved by such mycor-rhization helper bacteria MHB . The results with T terrestris suggest that the mechanisms involved in interactions between bacteria and mycorrhizal establishment are partly fungus-specific. The results of the experiments in aseptic conditons suggest that the MHB act directly on the plant or and on the fungus. Their stimulating effect is not the result of the suppression of root pathogens or other inhibitors of mycorrhizal infection. MHB could be used .

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