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It's important to save and continue to grow heirloom species, sure. But almost no cultivated species are native to where they're grown.
Patent bullshit aside.
It's interesting about native species. Think about apple trees in the UK. They grow very well here, the climate is suited perfectly, they don't seem to be invasive (talking as a layperson here). Yet they were introduced about 2000 years ago by the Romans. Does that mean they're old enough to now count as native? I mean, if you go back far enough, everything came from somewhere else. Unless you're looking at a deep-sea vent where life very first evolved, then it has spread from somewhere else.
Maybe if I was a botanist or ecologist, I would know the actual answer. But I'm just a person who loves thinking about things in a philosophical way, without necessarily wanting to research in-depth answers for every little puzzle
Rice is a well-understood plant with well-understood properties. One of these properties is that it just doesn't have many vitamins. If you want vitamins, you have to get another plant as a side-dish.
What these mad scientists propose is to change the very nature of rice to make it something that it is not, to solve a problem (Vitamin A deficiency) that could be approached with much less severe measures (like, growing carrots as a side-dish).
Agriculture is like medicine: You should always attempt to use the approach that is least invasive and has the smallest possible impact, while still solving the problem. This way, you minimize complications and reduce risks.
Rice already has the beta-carotene genetic pathway. It's just missing the final enzyme gene to cause production of the precursor product.
Furthermore, people have already tried to introduce alternative crops. But people who live there aren't interested. If a crop like carrots isn't a part of their cuisine, they have little to no interest in altering the foods they eat. Especially if they're already subsistence farmers with limited crop growing areas.