TAILIEUCHUNG - Báo cáo khoa học: " Sélection de familles de sapin de Douglas (Pseudotsuga menziesii) pour leur aptitude au bouturage : conséquences pour la diffusion de variétés améliorées"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: " Sélection de familles de sapin de Douglas (Pseudotsuga menziesii) pour leur aptitude au bouturage : conséquences pour la diffusion de variétés améliorées. | Ann Sci For 1996 53 1113-1126 Elsevier INRA 1113 Article original Selection de families de sapin de Douglas Pseudotsuga menziesii pour leur aptitude au bouturage consequences pour la diffusion de variétés améliorées N Schermann M Verger JC Bastien station d amelioration des arbres forestiers Inra 45160 Ardon France Reẹu le 3 mars 1995 accepté le 24 avril 1995 Summary - Bulk vegetative propagation of Douglas fir Pseudotsuga menziesii full-sib families. Vegetative propagation of elite full-sib families is one of the most promising means to obtain high genetic value material for intensive forestry. In France selection for vegetative propagation ability would be necessary for operational production of cuttings from Douglas fir elite full-sib family seedlings on economical and technical grounds. Potential for such a selection was appreciated on Douglas fir full-sib families from a 7 X 7 half-diallel fig 1 . Tip cuttings were collected on seedlings raised in greenhouse with intensive conditions for 1 year and rooted under fog in a complete block design experiment. The multiplication coefficient Coef number of well rooted cuttings per seedling was broken down into three traits number of cuttings NB rooting rate Rac and root quality Qual . Altogether data were collected on 14 573 cuttings. At the family level all study traits Coef NB Rac Qual and height of stock plants HT show high values of variability and heritability as well as favourable correlations tables I and II giving rise to appreciable expected genetic gains on multiplication coefficient. Thus in the present experiment NB Qual and Rac vary in a 1 to 2 ratio and Coef in a 1 to 4 ratio between extreme family values. Selecting 10 of the best families would increase the multiplication coefficient from 15 to 26 well rooted tip cuttings per seedling. Variability between full-sib families for the multiplication coefficient and its components is mostly due to general combining ability GCA effects fig 2 and coefficient R

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp