TAILIEUCHUNG - Báo cáo khoa học: " The effects of ectomycorrhizal status on carbon dioxide assimilation capacity, water-use efficiency and response to transplanting in seedlings of Pseudotsuga menziesii (Mirb) Franco"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:" The effects of ectomycorrhizal status on carbon dioxide assimilation capacity, water-use efficiency and response to transplanting in seedlings of Pseudotsuga menziesii (Mirb) Franco. | Ann Sci For 1990 21 551 -563 Elsevier INRA 551 Original article The effects of ectomycorrhizal status on carbon dioxide assimilation capacity water-use efficiency and response to transplanting in seedlings of Pseudotsuga menziesii Mirb Franco JM Guehl 1 J Garbaye 2 1INRA Centre de Recherches de Nancy Laboratoire de Bioclimatologie et d Ecophysiologie Forestidres 54280 Champenoux 2INRA Centre de Recherches de Nancy Laboratoire de Microbiologie Forestidre F 54280 Champenoux France Received 30 March 1990 accepted 5 December 1990 Summary One year-old Douglas fir seedlings mycorrhizal with Laccaria laccata or with Thele-phora terrestris and grown at two levels of phosphorus in the nutrient solution 10 and 40 mg-l 1 P were compared for water relations and gas exchange before and after transplanting in non-limiting water conditions. The results show that I L laccata is more efficient than T terrestris in increasing photosynthesis and water use efficiency ii phosphorus deficiency reduces photosynthesis and water use efficiency Hi the stimulating effect of L laccata on photosynthesis and water use efficiency is at least partly due to the improvement of phosphorus nutrition iv the photosynthesis reduction resulting from transplanting is due to a non-stomatal mechanism and v the recovery of photosynthesis involves the regrowth of the external mycelium of mycorrhizas. These results are discussed from the viewpoint of the plant-fungus relationships. ectomycorrhizae phosphorus nutrition co2 assimilation water-use efficiency I transplanting Résumé Effets du statut mycorhizien sur la capacité d assimilation de co2 I efficience d utilisation de J eau et la réponse à la transplantation de semis de Pseudotsuga menziesii Mlrb Franco. Des semis de 1 an de douglas mycorhizds par Laccaria laccata OU Thelephora ter-restris ont dtd elevds durant une saison de croissance à 2 niveaux de phosphore dans la solution nutritive 10 et 40 mg l 1P et ont été compards du point de vue des relations .

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