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Plant and Cell Physiology, 1985, Vol. 26, No. 7 1361-1367
© 1985

Article

Chlorophyll b-Deficient Mutants of Rice

I. Absorption and Fluorescence Spectra and Chlorophyll a/b Ratios

Tomio Terao1, Atsushi Yamashita2 and Sakae Katoh3

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

Absorption spectra and their fourth derivatives of chloroplasts isolated from 16 different rice chlorina mutants were determined at liquid nitrogen temperature. The results suggest that Chl b is absent from 10 mutants labelled chlorina-1 to -10, while 6 mutants named chlorina-11 to -16 contain low levels of Chl b. Low temperature fluorescence emission spectra indicate that a light-harvesting Chl a/b protein of photosystem I is present in chlorina-11 to -16 but not in chlorina-1 to -10. Reinvestigation of Chl a/b ratios by a sensitive fluorescence method shows that the 16 mutants are divided into three groups different in the degree of Chl b-deficiency; chlorina-1 to -10 totally lack Chl b (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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