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Flavonoids are natural pigments occurring in plants and are present in fruits, leaves, stems, roots, and flowers. Tobacco plants transformed with an  MYB  regulatory gene from either  Solanum chilense  ( Sc ) or  S. lycopersicum  ( Sl ) demonstrate that  ScANT1  induces a higher level of anthocyanin accumulation in comparison to  SlANT1  and that this gene is sufficient to promote increased anthocyanin levels. We compared the aptitude of ScANT1 protein to induce anthocyanin accumulation to that of SlANT1 protein in tobacco plants. We also tested the effect of amino acid substitutions in  Sc ANT1 and  Sl ANT1. We examined these synthetic alleles' effect following the over‐expression of additional anthocyanin synthesis regulators, such as the tomato bHLH (SlJAF13) protein. Our results show that the amino acid changes that differentiate  ScANT1  from  SlANT1  are the main contributors to the advantage that  ScANT1  has over  SlANT1  in anthocyanin accumulation per transcript unit. We further demonstrated that altering the amino acid composition of  Sl ANT1 could increase anthocyanin accumulation, while reciprocally modifying ScANT1 lowers the anthocyanin level. These results confirm the increased anthocyanin level in tobacco is attributed to the amino acid differences between  Sc ANT1 and  Sl ANT1. We also show that the co‐expression of  SlJAF13  with SlANT1 in tobacco plants represses the anthocyanin production.

physiologia plantarum

Functional analysis of   MYB   alleles from   Solanum chilense   and   Solanum lycopersicum   in controlling anthocyanin levels in heterologous tobacco plants