Journal Article

Distribution and Geometric Isomerism of Neoxanthin in Oxygenic Phototrophs: 9′-<i>Cis</i>, a Sole Molecular Form

Shinichi Takaichi and Mamoru Mirauro

in Plant and Cell Physiology

Published on behalf of Japanese Society of Plant Physiologists

Volume 39, issue 9, pages 968-977
Published in print September 1998 | ISSN: 0032-0781
Published online September 1998 | e-ISSN: 1471-9053 | DOI: https://dx.doi.org/10.1093/oxfordjournals.pcp.a029461
Distribution and Geometric Isomerism of Neoxanthin in Oxygenic Phototrophs: 9′-Cis, a Sole Molecular Form

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The distribution and geometric form (cis or trans) of neoxanthin, one of the major carotenoids of oxygenic phototrophs, were systematically examined. The 9′-cis form of neoxanthin, but not the all-trans form, was found in chlo-roplasts of seed plants, ferns, mosses and green algae, all of which contain chlorophylls a and b. In contrast, neoxanthin was not found in other algal classes, such as Hetero-kontophyta, Rhodophyta and oxygenic phototrophic pro-karyotes. Consequently, with regard to phylogeny, the appearance of neoxanthin appears to be associated with the appearance of chlorophyll b. In non-photosynthetic organs, such as petals and fruits, the presence of neoxanthin was classified into four types; those having only the 9′-cis form, those with only the all-trans form, those with both forms, and those without either form. Thus only 9′-cis neoxanthin is found in chloroplasts, and the all-trans neoxanthin is found only in non-photosynthetic organs. Because the absorption spectra of both forms are almost identical, their functions in photosynthesis might be similar. 9′-Cis neoxanthin is not involved in the xanthophyll-cycle, whereas it is a suitable substrate for abscisic acid synthesis. Differences in geometric isomerism are discussed in relation to abscisic acid synthesis.

Keywords: Abscisic acid; Carotenoid; Chlorophyll b; 9′-Cis neoxanthin; Neoxanthin; Phylogeny

Journal Article.  0 words. 

Subjects: Biochemistry ; Molecular and Cell Biology ; Plant Sciences and Forestry

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