Đang chuẩn bị liên kết để tải về tài liệu:
Báo cáo khoa học: "Allozyme assessment of genetic diversity within the relic Sicilian fir Abies nebrodensis (Lojac.) Mattei"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Allozyme assessment of genetic diversity within the relic Sicilian fir Abies nebrodensis (Lojac.) Mattei. | 345 Ann. For. Sci. 56 1999 345-355 Inra Elsevier Paris Original article Allozyme assessment of genetic diversity within the relic Sicilian fir Abies nebrodensis Lojac. Mattei Fulvio Duccia Roberta Proiettia Jean-Michel Favreb a Istituto Sperimentale per la Selvicoltura viale s. Margherita 80-52100 Arezzo Italy bLaboratoire de biologie forestiere associé Inra faculte des sciences BP 239 54506 Vandoeuvre-lès-Nancy cedex France Received 9 April 1997 accepted 11 February 1999 Abstract - Allozyme markers 11 loci 32 alleles have been used to estimate the genetic diversity within the unique surviving population of the relic species Abies nebrodensis. Results were analysed in comparison with a reference system composed of 16 Italian populations of A. alba and one representative provenance of A. cephalonica A. equi-trojani A. bornmuelleriana and A. nordmanni-ana. These investigations allowed us i to show that alleles Idh-2a and Pgi-la have contributed to the differentiation of the A. nebro-densis population from those of the reference system ii to show that the genetic diversity within A. nebrodensis is similar to that of dynamic silver fir populations growing in analogous isolation and progressive drifting situations while simultaneously a very high excess of homozygotes is detected iii to identify in situ three different zones which corresponded to the diversity core of the species one site in recolonizing phase and one site in an extinction phase. The origin of this particular situation is discussed and silvicultural interventions to relaunch the dynamics of the species are suggested. Inra Elsevier Paris. Abies nebrodensis I mediterranean firs genetic diversity allozymes Résumé - Evaluation par analyse du polymorphisme alloenzymatique de la diversité génétique au sein de 1 espèce relique Abies nebrodensis Lojac. Mattei. Des marqueurs alloenzymatiques 11 loci 32 allèles ont été utilises pour évaluer la diversite génétique au sein de la seule population existante de 1 .