tailieunhanh - Báo cáo khoa học: "Effect of endomycorrhizas and nematodes on the growth of seedlings of Dicorynia guianensis Amshoff, a tree species of the tropical rain forest in French Guiana "

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Effect of endomycorrhizas and nematodes on the growth of seedlings of Dicorynia guianensis Amshoff, a tree species of the tropical rain forest in French Guiana. | Ann Sci For 1997 54 271-277 Elsevier INRA 271 Original article Effect of endomycorrhizas and nematodes on the growth of seedlings of Dicorynia guianensis Amshoff a tree species of the tropical rain forest in French Guiana M Béreau1 E Louisanna J Garbaye2 Station de recherchesforestieres Inra BP 709 97387 Kourou Centre de recherchesforestieres de Nancy. Inra 54280 Champenoux France Received 30 November 1995 accepted 17 July 1996 Summary - Seedlings of Dicorynia guianensis Amshoff an economically important timber tree species of the primary tropical rain forest of French Guiana were grown in pots containing a disinfected soil inoculated or not with forest soil mycorrhizal roots of D or nematodes. Plant growth parameters and root endomycorrhizal colonization were measured after 200 days. The results are inconclusive about the role of nematodes but clearly show that D guianensis is dependent on endomycorrhizal symbiosis for its development the top dry weights of the seedlings inoculated with soil or roots with 87-84 endomycorrhizal roots are 77 and 54 higher respectively than that of the uninoculated seedlings with no mycorrhizas observed . In relation with previous observations in the forest these results support the hypothesis that endomycorrhizas play a major role in the regeneration of D guianensis. tropical rain forest Dicorynia guianensis seedlings endomycorrhizas experimental approach Resume - Effet des endomycorhizes et des nematodes sur la croissance des semis de Dicorynia guianensis Amshoff une essence de la foret tropicale humide primaire de Guyane franẹaise. Des semis de D guianensis ont été cultivés en pots sur un sol désiníecté inoculé OU non avec un sol forestier des racines mycorhizees de D guianensis ou des nematodes. Des paramètres de croissance des plantes et la colonisation endomycorhizienne des racines ont été mesurés au bout de 200 j. Les résul-tats ne sont pas concluants en ce qui concerne le role des nematodes mais montrent .