Abstract Absorption spectra of intact thalli and t heb pigment compositions of eleven species of chlorophycean seaweeds were investigated. The in vivo absorption spectra of six species including Ulva japonica, Cladophora wrightiana, Valonia macrophysa, Codium adhaerens, Codium mamillosa and Codium fragile showed a broad but distinct peak around 540 nm. The green light-absorbing pigment in these algae was chiomatographically identified äs siphonaxanthin. The occurrence of this pigment in the "deep-water species" seemed rather to emphasize its ecological importance than its correlation to the algal taxonomy. Introduction In a previous paper, Yokohama (1973) reported that the absorption spectrum of the intact thallus of Ulva japonica, a deep-water species of chlorophycean seaweeds, showed an absorption peak at about 540 nm, and that this alga can utilize green light for photosynthesis äs effectively äs white light. The results suggest that this green alga may contain a particular pigment having an absorption band at about 540 nm in vivo and it is related to the photosynthetic activity of the alga äs an important factor. We, therefore, attempted to identify the pigment. The result will be reported in this paper. Materials and Methods Eleven species of chlorophycean seaweeds were collected from the intertidal
Botanica Marina – de Gruyter
Published: Jan 1, 1977
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