Effect of UV-B radiation on the fatty acid composition of the marine phytoplankter Tetraselmis sp.. relationship to cellular pigments

Abstract

Effect of UV-B radiation on the fatty acid composition of the marine phytoplankter Tetraselmis sp.: relationship to cellular pigments Joaquim I. ~o e s l *~, Nobuhiko H a n d a l , Satoru ~a g u c h i~, Takeo ~a m a '

Metabolism of neutral monosaccharide constituents of storage and structural carbohydrates in natural assemblages of marine phytoplankton exposed to ultraviolet radiation

“…Also note that although expos,ure to UVR resulted in reduced nitrogen assimilation, such exposure did not seem extreme enough to completely inhibit protein synthesis and induce the diversion of newly fixed carbon into storage glucose. In support of this view, our studies on the effects of UVR on amino acid synthesis in the same samples as used in the present study (Goes et al 1995a) and in Tetraselmis sp. (Goes et al 1995b) showed that amino acids and protein synthesis continued, although at a slower rate, during incubations in the presence of UVR (Table 2).…”

“…Based on the present study and our earlier studies (Goes et al 1994(Goes et al , 1995a, we have illustrated in Fig. 5 the impact of UVR on the major metabolic biosynthetic pathways in phytoplankton.…”

“…Recently, we have been investigating changes in the rates of biosynthesis and in composition of biochemical compounds (fatty acids, Goes et al 1994; amino acids, Goes et al 1995a,b) that accompany decreases in the photosynthetic rates in phytoplankton exposed to UVBR. In this study, we describe the effects of natural UVR on the patterns of biosynthesis and the composition of monosaccharide components within the carbohydrate pool of marine phytoplankton.…”

“…The Pyrex bottles were covered with a plastic sheet that was transparent to white light but opaque to UVR, and these served as the -UV samples. The light transmission characteristics of the quartz and Pyrex incubation bottles and the plastic UVR shield, as measured by a Shimadzu UV-VIS 160 UV-visible spectrophotometer, and the incubation conditions during the experiments were presented by Goes et al (1995a). Incubation experiments began at dawn and ended well before dusk (incubation period, 7-8 h), after which the samples were filtered for nutrients, pigments, bulk carbon assimilation, and uptake of 13C into watersoluble and water-insoluble monosaccharides.…”

Effects of UV radiation on five marine microphytobenthic Wadden sea diatoms, isolated from the Solthörn tidal flat (Lower Saxony, southern North Sea) – Part II: changes in carbohydrate, amino acid and fatty acid composition

“…Several studies have reported that UV-B has qualitative effects on the distribution of fatty acids (FA) in algae (e.g. Goes et al, 1994;Wang & Chai, 1994;. Besides others, the relative increase of short-chained fatty acids and a decrease of polyunsaturated fatty acids (PUFAs) are described as common responses in UV-stressed phytoplankton cells (e.g.…”