ClTST2 increases sugar accumulation in fruits. A to C, The parental lines 97103, G35, F1, and BC1 fruits for NIL population construction. D, Sugar content and relative expression levels of ClTST2 in (from left to right) 97103 and G35 parental lines, F1, BC1 plants, and 50 segregating (BC2F2) NILs. E, Suc injection induces early maturity in strawberry fruits; red arrows point at the injection site. F to H, ClTST2 overexpressing strawberry fruit sections (OE), coloration compared to the empty vector control. I, Accumulation of sugars in ClTST2 overexpressing strawberry fruit sections (OE) and in the empty vector control. J, Semiquantitative RT-PCR expression analysis of FaACT and ClTST2 in the empty vector controls 1 to 3 and in ClTST2 overexpressing strawberry fruit sections (ClTST2-1-3 OE). The same sample order as in I for FaACT and ClTST2 expression analyses, respectively.