title: Floridoside, L-Isofloridoside, and D-Isofloridoside in the Red Alga Porphyra columbina (Seasonal and Osmotic Effects).
abstract: The quantitative heteroside distribution in Porphyra columbina Montagne and Bangia atropurpurea (Roth) C. Agardh (Bangiales, Rhodophyta) has been measured using 13C-nuclear magnetic resonance spectroscopy and gas-liquid chromatography. In P. columbina, floridoside and both D- and L-isofloridoside were recorded, with concentrations of L-isofloridoside exceeding those of floridoside. All three compounds were also measured in B. atropurpurea. Marked changes in the relative amounts of the heterosides were recorded throughout the season. The role of L-isofloridoside in the osmotic acclimation of P. columbina has been demonstrated.
authors.affiliation: School of Biological Science (U.K., R.J.K.) and School of Biochemistry and Molecular Genetics (K.D.B.), University of New South Wales, Kensington 2033, Australia.
authors.forename: U.
authors.initials: U
authors.lastname: Karsten
authors.forename: K. D.
authors.initials: KD
authors.lastname: Barrow
authors.forename: R. J.
authors.initials: RJ
authors.lastname: King