TAILIEUCHUNG - Báo cáo lâm nghiệp: "Influence of exogenous L-proline on embryogenic cultures of larch (Larix leptoeuropaea Dengler), sitka spruce (Picea sitchensis (Bong.) Carr.) and oak (Quercus robur L.) subjected to cold and salt stress"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Influence of exogenous L-proline on embryogenic cultures of larch (Larix leptoeuropaea Dengler), sitka spruce (Picea sitchensis (Bong.) Carr.) and oak (Quercus robur L.) subjected to cold and salt stress. | Ann. For. Sci. 61 2004 125-128 INRA EDP Sciences 2004 DOI forest 2004003 125 Note Influence of exogenous L-proline on embryogenic cultures of larch Larix leptoeuropaea Dengler sitka spruce Picea sitchensis Bong. Carr. and oak Quercus robur L. subjected to cold and salt stress Deirdre GLEESONa Marie-Anne LELU-WALTERb Michael PARKINSONa a Plant Cell Culture Laboratory School of Biotechnology Dublin City University Dublin 9 Ireland b Unité Amélioration Génétique et Physiologie Forestières INRA-CRO BP 20 619 Ardon 45166 Olivet Cedex France Received 8 July 2002 accepted 6 March 2003 Abstract - The effect of exogenous L-proline 1 mM 10 mM and 100 mM on embryogenic cultures of larch sitka spruce and oak subjected to environmental stresses was examined. Low temperature 4 C completely inhibited growth of the cultures and this was partially alleviated by the addition of proline. Our studies show that not only can cultures survive low temperatures but are capable of active growth while the cold stress is still being applied. Growth was inversely related to NaCl with complete inhibition at 200 mM. Proline stimulated growth at all concentrations tested permitting growth with 200 mM NaCl even at low 1 mM proline concentrations. Release of internal cellular potassium was inversely related to freezing temperature and this release was reduced by exogenous proline. These results for cultures of forest species are consistent with findings previously reported for deciduous herbaceous angiosperms and suggest that proline may have a role in protection of forest species from environmental stresses. trees chilling environmental stress tolerance Résumé - Effet de la L-proline apportée de manière exogène à des cultures embryogènes de mélèze hybride Larix leptoeuropaea Dengler d épicéa de sitka Picea sitchensis Bong. et de chêne Quercus robur L. soumises à des stress au froid et salin. Des cultures embryogènes de mélèze hybride d épicéa de sitka et de chêne ont été soumises à .

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