The metabolism can possibly optimized for the habitat:
- better endurance for dark periods (e.g. dust storms, havaries, etc. )
- ability to cope with dim sunlight (grow slow, but grow ...)
- ability to cope with radiation
Compared with legacy vegetables the new developed genetically engineered plants may not be stable in the long run. Genetic alteration will be necessary after a while, maybe unexpectedly. It should be used only if the settlers have the ability to do corrections. Same with computer software. If a software bug shows up in a vital system (e.g. Y2K), the settlers would want someone who can fix it. DNA is a kind of software.
- What genetic alterations exist up to now?