[thelastgallon]

This is happening. It is better to do it in rice which is widely consumed, staple in most asian countries.

"C4 rice research, currently in its early phases, hopes to develop a new type of rice with improved photosynthesis capacity, known as C4. There are classes of plants known as “C3” and “C4” – referring to how they convert light energy into sugar or photosynthesize. Rice has a C3 photosynthetic pathway. C3 photosynthesis is inefficient at converting inputs to grain, as opposed to the C4 pathway, in which resources are processed more efficiently and converted into higher grain production." [1]

In C3 plants, the carbon dioxide fixation takes place only at one place. In C4 plants, the carbon dioxide fixation takes places twice (one in mesophyll cells, second in bundle sheath cells). C3 plants possess only one CO2 acceptor. C4 plants possess two CO2 acceptors (primary acceptor and secondary acceptor).[2]

[1] https://www.irri.org/news-and-events/news/rice-future-gets-f...

[2] https://www.easybiologyclass.com/similarities-and-difference...).