Planta 1976-Jan
Betacyanin biosynthesis in the isolated hypocotyls bei Acetabularia mediterranea.
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Isolated hypocotyls synthesize betacyanin after light exposure in Amaranthus caudatus L. Pigment synthesizing capacity is reduced in the hypocotyls with increased incubation of seedlings in dark after 24h. External feeding of precursors of betacyanin L-tyrosine and DOPA enhances pigment synthesis in the isolated hypocotyls to equal that of intact hypocotyls. Cotyledons are probably the source of precursors while both cotyledons and hypocotyls are the sites of betacyanin synthesis. Betacyanin synthesizing capacity is progressively lost from the base of the hypocotyl and precursors could not induce pigment synthesis in these regions.