TAILIEUCHUNG - Báo cáo toán học: "The effect of temperature and water stress on laboratory germination of Eucalyptus globulus Labill. seeds of different sizes"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: The effect of temperature and water stress on laboratory germination of Eucalyptus globulus Labill. seeds of different sizes. | 245 Ann. For. Sci. 57 2000 245-250 INRA EDP Sciences Original article The effect of temperature and water stress on laboratory germination of Eucalyptus globulus Labill. seeds of different sizes Marian Lopez Jaime M. Humara Abelardo Casares and Juan Majada Dpto. Biología de Organismos y Sistemas Unidad de Fisiologia Vegetal C Catedrático Rodrigo Uría s n and Instituto Universitario de Biotecnología de Asturias-CNB CSIC Universidad de Oviedo E-33071 Oviedo Asturias Spain Received 4 February 1999 accepted 16 August 1999 Abstract - Germination rate and germination capacity of Eucalyptus globulus Labill. increased significantly with increasing temperature 13 to 33 C for all seed sizes to an optimum at 28 C then decreased. Biggest seeds generally germinated best at all temperatures. Germination was also very sensitive to water potential 0 to MPa with no germination occuring at potentials below MPa. Eucalyptus globulus germination polyethylene glycol seed size temperature water potential Résumé - Effet de la temperature et du stress hydrique sur la germination en laboratoire de graines d Eucalyptus globulus Labill de differentes tailles. On a étudié l influence sur la germination des graines d Eucalyptus globulus Labill de temperatures constantes comprises entre 13 et 33 C et de potentiels hydriques compris entre 0 et -0 75 MPa. La germination était significative-ment influencee par la temperature et la taille des graines. La vitesse et le taux de germination augmentaient avec la temperature pour atteindre un optimum à 28 C et ensuite diminuaient. Quand la germination était effectuee en conditions de stress on observait une diminution du taux de germination entre -0 01 et -0 75 MPa. Plus aucune graine ne germait à -0 25 MPa et au-delà. Eucalyptus globulus germination dimension de la semence temperature potentiel hydrique 1. INTRODUCTION Eucalypt pulp has excellent properties for paper making and is in high demand. The development of new pulping technologies .

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