TAILIEUCHUNG - Báo cáo lâm nghiệp: "Roles of European and Japanese larch in the genetic control of growth, architecture and wood quality traits in interspecific hybrids (Larix × eurolepis Henry)"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Roles of European and Japanese larch in the genetic control of growth, architecture and wood quality traits in interspecific hybrids (Larix × eurolepis Henry). | Ann. For. Sci. 61 2004 25-33 INRA EDP Sciences 2004 DOI forest 2003081 25 Original article Roles of European and Japanese larch in the genetic control of growth architecture and wood quality traits in interspecific hybrids Larix X eurolepis Henry Luc E. PÂQUES INRA Unité d Amélioration de Génétique et de Physiologie des Arbres forestiers 45166 Olivet Cedex France Received 7 November 2001 accepted 23 December 2002 Abstract - The respective roles of European and Japanese larch species in the genetic control of traits in interspecific hybrids are examined. Two incomplete factorial mating design experiments involving European larch clones of Sudetan origin as the female parent and Japanese larch clones as the male parent have been used for that purpose. Traits investigated include growth architecture and wood quality parameters up to 16 years old. Results indicate that traits can be grouped into three categories according to the level of control by parental species i height growth controlled nearly equally by both parents ii BH diameter stem volume and architecture traits under a strong Japanese larch control and iii wood quality parameters predominantly controlled by the European larch. Several traits showed moderate to high full-sib family heritabilities over total height stem volume branch angle and wood density while others like heartwood proportion taper density of branching or stem straightness showed low values. Several traits appear to be under non-negligible non-additive genes effects heartwood proportion taper stem straightness BH girth and modulus of elasticity. Implications for further breeding are discussed. Larix hybridisation heritability growth stem form wood properties Résumé - Contribution du mélèze d Europe et du mélèze du Japon dans le contrôle génétique de la croissance de l architecture et de la qualité du bois chez le mélèze hybride Larix X eurolepis Henry . Cette étude examine l importance relative du mélèze d Europe et du mélèze du

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