Abstract
Induction of anthocyanin synthesis occurs during metabolic differentiation in carrot suspension cultured cells grown in medium lacking 2,4-dichlorophenoxyacetic acid (2,4-D), and is closely correlated with embryogenesis. Anthocyanin synthesis may also be induced by light-irradiation under different culture conditions. The phenylalanine ammonia-lyase (PAL) gene (TRN-PAL), which was transiently induced by the transfer effect, was also rapidly induced after light-irradiation. However, TRN-PAL was not involved in anthocyanin synthesis. A second PAL gene, ANT-PAL, was involved in anthocyanin synthesis. ANT-PAL was induced during metabolic differentiation in medium lacking 2,4-D parallel with the induction of chalcone synthase (CHS). PAL genes in the carrot genome are expressed differentially depending on the nature of the environmental stimulus, e.g. transfer effect and light, and other parameters which also affect anthocyanin synthesis.
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