Take the tomato genome and look at any random pigmenting gene. There are a finite number of mutations (flips, insertions, deletions) to change that into a gene

Take the tomato genome and look at any random pigmenting gene. There are a finite number of mutations (flips, insertions, deletions) to change that into a gene producing glow-in-the-dark proteins. All of those mutations can, and do, occur without human intervention. If only there was any Darwinian advantage for tomatoes to glow in the dark, they would most likely be doing so already.