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Anatomical differences between C3 and C4 leaves. (A) C3 (Oryza sativa L., rice variety IR64) and (B) C4 (Setaria viridis) leaf. Mesophyll cell (MC) of rice is filled with chloroplasts which is more than 90% of the total chloroplasts, whereas, the bundle sheath cells (BSC) have very few number of chloroplasts which account for less than 10% of the total chloroplasts in the rice leaves. In C4 leaf, chloroplasts are localized in BSC as well as in MC.
