One important thing to remember about this study is that the introgression lines typically have the true tomato parent in common, and are backcrossed or otherwise genetically manipulated to introduce one small definable segment of a wild parent genome while maintaining the majority of genes from that same tomato parent.
So the predictive value of leaflets for sweetness might not hold true at all in the general tomato population - unless they have wild tomato genes in the mix.
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