Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Variations in seed and seedling responses to water stress in three provenances of Eucalyptus camaldulensis Dehnh. | 388s Ann. Sci. For. 1989 46 suppl. 388S-392S Forest Tree Physiology E. Dreyer ef al. eds. Elsevier INRA Variations in seed and seedling responses to water stress in three provenances of Eucalyptus camaldulen-sis Dehnh. A. Gibson and . Bachelard Department of Forestry Australian National University Canberra Australia Introduction Previous work Bachelard 1985 1986a b Gibson and Bachelard 1987 Yang et al. 1988 has shown that seeds and seedlings of eucalypt species subspecies and provenances within a species may differ in their germination and growth responses to water stress. Seeds from 3 provenances of Eucalyptus camaldulensis Dehnh. differed in their abilities to germinate under different atmospheric vapour pressure deficits VPD and plate matric potentials in a manner consistent with the moisture conditions in the environment in which these provenances occur naturally Gibson and Bachelard 1987 . In this study the effects of water stress on the initial establishment and early growth of seedlings from 3 provenances of E. camaldu-lensis were examined. Materials and Methods The 3 provenances of E. camaldulensis Katherine and Petford from monsoonal sites Tennant Creek from a semi-arid site were the same as those used previously Gibson and Bachelard 1987 . The initial establishment hypocotyl raised cotyledons opened of seedlings from germinated seeds placed on the surface of soils at different moisture contents 35 18 and 10 w w in containers in a controlled environment cabinet was observed and early seedling growth measured. Effects of water stress 10 . for 6 wk on tissue-water relations water use efficiency partitioning of dry matter into roots stems and leaves leaf growth and morphology were also determined in 8 wk old seedlings grown in pots in a glasshouse with and without added fertiliser. Results Establishment and early seedling growth Seedlings established from most seeds sown on the surface of soils at 35 . with slightly fewer Katherine seedlings .
