Fruit of pennellii and its hybrid with tomato
Fruit of S. pennellii (R), cultivated tomato (L), and the F1 hybrid. [photo C.M. Rick]

Tomatoes Once Tasted Like Cucumbers

This article by Bea Perks writing for Chemistry World magazine, titled Tomatoes Once Tasted Like Cucumbers, tells about the discovery of a class of volatile compounds (C9 aldehydes) associated with cucumber-like flavor in fruit of S. pennellii, but absent in cultivated tomato.