Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Effects of saline stress on Eucalyptus seedlings. | 376s Ann. Sci. For. 1989 46 suppl. 376s-378s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA Effects of saline stress on Eucalyptus seedlings . Fathi and D. Prat Laboratoire de Génétique des Populations d Arbres Forestiers Laboratoire associé CTFT-ENGREF ENGREF 14 rue Girardet F-54042 Nancy France Introduction Forests in arid countries especially around the Sahel are overexploited because of the great needs of local populations for wood. Native species adapted to aridity do not produce enough wood. Plantations of adapted and fast-growing species seem to be the best way to meet local demand. Difficulties arise not only from drought but also from the salinity of soils Chapman 1975 . Plants must be selected for drought- and salt-tolerance and then grown in a favorable environment. Some woody species such as Eucalyptus are fast-growing and very plastic Martin 1987 . Eucalyptus plantations may be one of the ways to produce wood under these difficult conditions and thus spare the natural stands. Three Eucalyptus species E. alba E. camaldu-lensis and E. microtheca were tested for their salt-tolerance. Saline stress was applied at germination and to seedlings in a greenhouse. Materials and Methods Seeds were collected in the natural range of the 3 species they were available as species representative seedlots or provenance-representative seedlots. Seeds were sown on perlite soaked with nutritive medium Murashige and Skoog 1962 in jars with salt NaCI 50-200 mM added to study salt-tolerance at the germination stage. For measurement of salt-tolerance of seedlings in the greenhouse seeds were sown on vermiculite plants were replanted in seed-pans filled with vermiculite and watered with a dilute nutritive solution N p K and oligonutrients . 3 mo old seedlings were watered for 1 mo with and a saline solution NaCI 100-600 mM added to the nutritive solution Fathi 1987 . Mineral elements Ca K and Na in the plants were estimated by flame photometry Chloride was .
