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Báo cáo khoa học: "Compatible solutes in different organs of mangrove trees "

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Compatible solutes in different organs of mangrove trees . | 842s Ann. Sci. For. 1989 46 suppl. 842s-844s Forest Tree Physiology E. Dreyer etal. eds Elsevier INRA Compatible solutes in different organs of mangrove trees M. Popp1 and J. Polania2 1 Institut fur Angewandte Botanik Universitat Munster F.R.G. and 2 Institut fiir Pflanzenphysiologie Universitẳt Wien Austria Introduction According to Brown and Simpson 1972 a compatible solute may be loosely defined as one which at high concentration allows an enzyme to function effectively . This definition was developed from work on sugar-tolerant yeast and was later adapted to halophytes which also need osmolytes in the cytoplasm to assure the intracellular osmotic adjustment between vacuole rich in NaCI and cytoplasm poor in NaCI Stewart eta . 1979 . Earlier work on mangroves has revealed that these halophytic trees stored high concentrations of either mannitol pinitol quebrachitol proline or glycine betaine in their leaves Popp et al. 1985 . In the meantime further work on the Rhizophor-aceae showed that the cyclitol formerly identified as pinitol was iD-O-methyl-muco-inositol Richter Thonke and Popp manuscript in preparation . The present study was undertaken to elucidate the role of these organic solutes in various mangrove species by investigating their distribution in different plant organs and their reaction to long- and short-term variations in salinity. Materials and Methods Mangrove material was collected at the Dampier Archipelago Western Australia during March April 1984. Sample preparation and analytical procedures were those described by Popp et al. 1985 Culture experiments were carried out in a glass-house in Vienna with additional light and a temperature regime of 28-30 C during the day and 20 C at night. Plants were grown on a substrate of volcanic beads and supplied with appropriate concentrations of seawater prepared from commercially available sea-salt for aquariums. 1 mM NH4NO3 1 mM NH4CI 0.1 mM KH2PO4 and 0.05 mM FeEDTA were added to the seawater. The .