Changes in tomato fruit size over the course of domestication: A) wild ancestor Solanum pimpinellifolium; B) semi-domesticated S. lycopersicum variety cerasiforme; C-F) domesticated Solanum lycopersicum varieties: D) lc mutant; E) lc and fas mutant; and F) ENO mutant
Fernando J. Yuste-Lisbona, Sandra Bretones, and Rafael Lozano

Amutation in the newly identified tomato fruit transcription factor EXCESSIVE NUMBER OF FLORAL ORGANS (ENO) promotes larger flowers and fruit in cultivated tomatoes, according to a study published on March 16 in PNAS.

ENO regulates the activity of a gene that maintains floral stem-cell homeostasis in the meristem, a region near the tips of the roots and shoots of plants that is rich in undifferentiated cells, the authors report in the paper, and a variant in the ENO promoter that was selected for during the domestication of tomatoes has resulted in the large fruits we recognize today.


F.J. Yuste-Lisbona et al., “ENO regulates tomato fruit size through the floral meristem development network,” PNAS, doi:10.1073/pnas.1913688117, 2020.

Interested in reading more?

The Scientist ARCHIVES

Become a Member of

Receive full access to more than 35 years of archives, as well as TS Digest, digital editions of The Scientist, feature stories, and much more!
Already a member?