TAILIEUCHUNG - Báo cáo lâm nghiệp: " Zygotic embryogenesis and empty seed formation in European larch (Larix decidua Mill.)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài:" Zygotic embryogenesis and empty seed formation in European larch (Larix decidua Mill.)" | Ann. For. Sci. 62 2005 129-134 INRA EDP Sciences 2005 DOI forest 2005004 129 Original article Zygotic embryogenesis and empty seed formation in European larch Larix decidua Mill. Branko SLOBODNÍKa Helmut GUTTENBERGERb a Department of Phytology Faculty of Forestry Technical University in Zvolen T. G. Masaryka 24 960 53 Zvolen Slovakia b Department of Plant Physiology University of Graz SchubertstraBe 51 8010 Graz Austria Received 25 November 2003 accepted 22 November 2004 Abstract - Zygotic embryo development and its influence on empty seed formation of the European larch Larix decidua Mill. was studied within a seed orchard in the Slovak Republic. Histological study revealed a fertilization date early June. Although embryogenesis was most intensive in June fully morphologically differentiated embryos were observed no earlier than in the second half of July. Multiple fertilization and simple polyembryony were relatively rare but their frequencies correlated with the efficiency of pollination. Only a small percentage of developing embryos reached full maturity. Degeneration included suppressed embryos from polyembryony as well as normal embryos occupying the optimal position within the corrosion cavity of the female gametophyte. The mean proportion of fertilized ovules without a viable embryo was 61 after open pollination and as high as 88 after controlled selfing. In total embryo degeneration reduced the potential full seed percentage by almost 40 and is therefore considered the most important cause of unsound seed development in European larch. larch embryo embryogenesis empty seed Résumé - Embryogenèse zygotique et formation des graines vides chez le mélèze d Europe Larix decidua Mill. . Le développement des embryons zygotiques et son influence sur la formation des graines vides du mélèze d Europe Larix decidua Mill. ont été observés en condition de verger à graines en République Slovaque. L étude histologique révèle que la période de fécondation la plus .

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