Abstract
From a physiological point of view, a close correlation has been suggested between the induction of embryogenesis, i.e. morphological differentiation, and that of anthocyanln synthesis, i.e. metabolic differentiation. I established a carrot suspension culture system in which anthocyanin synthesis and embryogenesis could be induced in the same culture and studled their relations. The results suggested that induction of anthocyanin and that of cell division, or undifferentiated growth, were the alter natures regulated by 2, 4-dichlorophenoxyacetic acid (2, 4-D). The activities of phenylalanine ammonia-lyase (PAL) and chalcone synthase (CHS) were found to play key roles in the regulation of anthocyanin synthesis by 2, 4-D. PAL and CHS genes and their transcripts were analyzed in detail, which indicated that there are two PAL genes in carrot, one being transiently and rapidly activated by stress, and the other being specifically induced during the 2, 4-D regulated anthocyanin synthesis.
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