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Plant and Cell Physiology, 1986, Vol. 27, No. 7 1361-1368
© 1986

Article

Effects of Growth Regulators on the Induction of Anthocyanin Synthesis in Carrot Suspension Cultures

Yoshihiro Ozeki1 and Atsushi Komamine2

Department of Botany, Faculty of Science, The University of Tokyo Hongo, Tokyo 113, Japan

The effects of plant growth regulators were investigated on anthocyanin synthesis induced by removing auxin from carrot suspension cultures. Of the auxins tested, 2,4-D showed the strongest inhibiting effect on anthocyanin synthesis and had the strongest promoting effect on undifferentiated growth. When 2,4-D was added to anthocyanin synthesizing cells, in which cell division had ceased, anthocyanin synthesis was repressed immediately, accumulated anthocyanin disappeared and cell division resumed. All cytokinins examined promoted anthocyanin synthesis in the absence of auxin. Both gibberellic acid (GA3) and abscisic acid inhibited anthocyanin synthesis in media lacking 2,4-D, though GA3 showed no effect on cell division. These effects of growth regulators on anthocyanin synthesis are similar to those reported for their effects on embryogenesis [Fujimura and Komamine (1975) Plant Sci. Lett. 5: 359, (1979) Z. Pflanzenphysiol. 95: 13, (1980) Z. PJlanzenphysiol. 99: 1]. The relationship between the induction of anthocyanin synthesis, metabolic differentiation, and embryogenesis are discussed.

1 Present address: Department of Biology, College of Arts and Sciences, The University of Tokyo, Komaba, Meguro-ku, Tokyo 153, Japan.

2 Present address: Biological Institute, Faculty of Science, Tohoku University, Sendai, Miyagi 980, Japan.

(Received November 28, 1985; Accepted July 23, 1986)
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