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Inhibition by Cytokinin of the Accumulation of Betacyanin in Suspension Cultures of Phytolacca americana

1992; De Gruyter; Volume: 47; Issue: 9-10 Linguagem: Inglês

10.1515/znc-1992-9-1012

1865-7125

Hiroshi Hirano, Masaaki Sakuta, Atsushi Komamine,

Seed Germination and Physiology

The accumulation of betacyanin was reduced by the addition of various cytokinins to suspension cultures of Phytolacca americana. The decrease in the accumulation of betacyanin was overcome by exogenously supplied tyrosine which is a precursor of betacyanin. Benzylaminopurine (BAP) decreased the level of free tyrosine in the cells. Feeding experiments using labeled tyrosine revealed that BAP reduced the incorporation of labeled tyrosine into betacyanins (to about 50% of the control rate). These results suggest that both the availability of tyrosine and the biosynthetic activity of the pathway from tyrosine to the betacyanins are involved in the inhibition of the accumulation of betacyanins by cytokinins in Phytolacca americana cells.