Differential Regulation of Phytoene Synthase PSY1 During Fruit Carotenogenesis in Cultivated and Wild Tomato Species (<i>Solanum</i> section Lycopersicon).

In this regard, it is interesting that PSY1 expression and PSY1 enzymatic activity are quite significant in the fruit of GF S. habrochaites (accession LA1777); however, there is no carotenoid accumulation because of impaired chromoplast formation [ 33 ] due to a mutation in the ORANGE protein [ 35 , 54 ].

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