Pigment and quinone content of two photosynthetic barley mutants

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Abstract
The pigment and quinone content of wild‐type barley (Hordeum vulgareL., cv. Svalöfs Bonus) and of two photosynthetic mutants was assayed. Wild type plants and the photosystem Hacking mutantviridis zb63contained chlorophyll a and b. whereaschlorina‐f2contained only chlorophyll a The inability of the mutant chlorina‐f2 to convert chlorophyll a into chlorophyll a appears to he the primary effect of the mutation. In both mutants, the carotenoid composition was virtually identical to that of the wild type. As compared to the wild type.chlorina‐f2contained less lutein and neoxanthin. The mutantviridis‐zb63contained less β‐carotene but more antheraxanthin and xeaxanthin than the wild type. The quinone content and composition of the wild type and the photosynthetic mutants was similar, and both mutants biosynthesized plastid quinones and chromanols starting from [14C]‐labeled tyrosine. The data indicate that carotenoid and quinone biosynthesis are not altered in the two mutants as compared to the wild type.