TAILIEUCHUNG - Báo cáo khoa học: "Tree improvement programs for European goals and strategies"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Tree improvement programs for European goals and strategies. | 368s Ann Sci For 1993 50 Suppl 1 368S-383S Elsevier INRA Review article Tree improvement programs for European oaks goals and strategies PS Savill PJ Kanowski Oxford Forestry Institute Department of Plant Sciences University of Oxford South Parks Road Oxford ox 1 3RB UK Summary Most work concerned with the improvement of European oaks is concentrated on Quercus robur and Q petraea. Improvement is constrained by limited knowledge of the extent and pattern of genetic variation the long period to reproductive maturity levels of seed production relative to demand and difficulties in vegetative multiplication. The goals of improvement activities have focused on straightness vigor and desirable branching on wood anatomy shrinkage density and color and susceptibility to problems such as frost cracks shakes and defoliation. Three aspects of breeding are currently receiving attention 1 in vitro methods for regeneration flower induction and genetic manipulation 2 technologies for clonal multiplication and 3 elements of classical breeding programs. Recent conceptual and technological advances and greatly increased research activity have raised expectations of genetic progress which will need to be accompanied by developments in associated topics such as silviculture pathology and wood science. oak Quercus I breeding genetic conservation improvement Resume Programmes d amelioration des chênes européens objectifs et strategies. La plu-part des travaux concernant amelioration des chênes européens est concentrée sur Quercus robur et Q petraea. L amelioration est rendue difficile du fait de la connaissance limitée des variations gé-nétiques de la longue période pour atteindre la maturité reproductive de la quantité de graines pro-duites par rapport à la demande et des problèmes rencontres concernant la multiplication vegetative. Les buts de ramélioration ont été concentres sur la rectitude la vigueur et la ramification ainsi que I anatomie du bois le retrait la densité la couleur

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