| Abstract: | Cobaltous ions (Co2+) inhibited light-mediated anthocyanin synthesisin excised first internodes of Sorghum bicolor (L.) Moench.Studies with precursors/intermediates of the anthocyanin biosyntheticpathway, such as acetate, phenylalanine, t-cinnamic acid, tyrosine,and p-coumaric acid were undertaken to identify the metabolicsite at which Co2+ ions inhibit anthocyanin synthesis. p-Coumaricacid partially restored anthocyanin synthesis. No other intermediatewas effective in bringing about recovery. It is suggested thatCo2+ might interfere with process/es which leads to the formationof p-coumaric acid, an intermediate of the anthocyanin biosyntheticpathway. Key words: Sorghum bicolor (L.) Moench, anthocyanin, cobaltous ions, phenylalanine ammonia-lyase |
