The characteristic foliage smell in SunGold (and SunSugar) is definitely heritable. There are likely multiple genes associated with this foliage smell and also for fruit taste. In advanced filial generations with crosses to SunGold and SunSugar, I don't see a tight association between fruit flavor and foliage smell, so doubt of many of the genes associated with these two traits are tightly linked. Having said that, the best stable line I have that was derived from such crosses has both the characteristic smell and the sweet, fruity flavor of the SunSugar parent.
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