i am looking for a plant-biology expert,
what would you say ? Which one is more complex?
C3 or C4 photosynthesis ?
I had a debate with a guy who has an education in plant biology, and i was told that C4 photosynthesis is a sort of C3-downgrade ...
i was told, that the C4 excluded a very complex photo-respiration step, therefore, the C4 is less complex, it is a 'C3 downgrade' and easy to evolve 60+ times over and over (by convergent evolution)
However, from what i could understand, the C4 is more complex, because there are newly evolved steps, newly evolved specialized cell anatomy, which seems to be more complex...
So which one is more complex? Could the C4 be considered as a C3-downgrade ?
Could some plant-biology expert comment on this?