TAILIEUCHUNG - Báo cáo khoa học: "Optimisation de l’élevage des pieds-mères de Douglas (Pseudotsuga menziesii (Mirb.)Franco) pour la multiplication végétative en vrac"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Optimisation de l’élevage des pieds-mères de Douglas (Pseudotsuga menziesii (Mirb.)Franco) pour la multiplication végétative en vrac. | Ann. Sci. For. 55 1998 785-799 Inra Elsevier Paris 785 Article original Optimisation de 1 élevage des pieds-mères de Douglas Pseudotsuga menziesii Mirb. Franco pour la multiplication vegetative en vrac Michel Verger a Celine Le Pichonb Michel Cazetb a Inra station d amelioration des arbres forestiers 45160 Ardon France bCemagref division ressources génétiques et plants forestiers domaine des Barres 45290 Nogent Vernisson France Reẹu le 12 mai 1997 accepté le ler avril 1998 Abstract - study of the optimal stock-plant management of Douglas-fir Pseudotsuga men-ziesii Mirb. Franco for bulk vegetative propagation. The French breeding program of Dou-glas-fir produces seeds of very high genetic value half or full-sib families but in insufficient quantity to provide an important source of reforestation planting stock. Bulk vegetative propagation offers the possibility to amplify the reforestation potential of these seed lots. Two strategies are currently being explored a selection of families for their ability for bulk vegetative propagation 31 and b improvement of the production system to enable a cheap stock-plant management. Three experiments were conducted between 1992 and 1997 at Orleans Inra and Nogent Vemisson Cemagref to investigate different methods of managing stock-plants the effects of different growing environments of artificial and natural lighting and of pruning and the behaviour of top and intermediate-cuttings were compared. The best management consists in a first crop of cuttings on 2-year-old stock-plants grown on nursery soil with a plastic mulch and under a 50 white shaded tunnel. In this case the multiplication rate number of rooted cuttings per stock-plant reaches 160 within 4 years of propagation without any decrease in vegetative propagation ability. A pilot production will now be carried out. Inra Elsevier Paris. bulk vegetative propagation cutting stock-plant I Douglas-fir Pseudostuga menziesii Resume - Le programme franẹais d amelioration .

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