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Chlorophyll b-Deficient Mutants of Rice: I. Absorption and Fluorescence Spectra and Chlorophyll a/b Ratios |
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| Authors: | Terao Tomio; Yamashita Atsushi; Katoh Sakae |
| Institution: | 1Department of Applied Physiology, National Institute of Agrobiological Resources Tsukuba Science City, Ibaragi 305, Japan 2Department of Moleculer Biology, National Institute of Agrobiological Resources Tsukuba Science City, Ibaragi 305, Japan 3Department of Pure and Applied Sciences, College of Arts and Sciences, University of Tokyo Komaba, Meguroku, Tokyo 153, Japan |
| Abstract: | Absorption spectra and their fourth derivatives of chloroplastsisolated from 16 different rice chlorina mutants were determinedat liquid nitrogen temperature. The results suggest that Chlb is absent from 10 mutants labelled chlorina-1 to -10, while6 mutants named chlorina-11 to -16 contain low levels of Chlb. Low temperature fluorescence emission spectra indicate thata light-harvesting Chl a/b protein of photosystem I is presentin chlorina-11 to -16 but not in chlorina-1 to -10. Reinvestigationof Chl a/b ratios by a sensitive fluorescence method shows thatthe 16 mutants are divided into three groups different in thedegree of Chl b-deficiency; chlorina-1 to -10 totally lack Chlb (Type I), chlorina-11 to -13 have Chl a/b ratio of about 10(Type II-A) and chlorina-14 to -16 have the ratio of about 15(Type II-B). (Received June 6, 1985; Accepted August 6, 1985) |
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