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Photosynthesis in $\mathrm{C}_4$ plants is relatively less limited by atmospheric $\mathrm{CO}_2$ levels because
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the primary fixation of $\mathrm{CO}_2$ is mediated via PEP carboxylase
The fixation of $\mathrm{CO}_2$ in $\mathrm{C}_4$ plants takes place in two places and by two different organic compounds. Phosphoenol pyruvate (PEP) is found in mesophyll cells which primarily fixes atmospheric $\mathrm{CO}_2$ into oxaloacetic acid (4C).
RUBISCO is present in bundle sheath cells where final fixation of $\mathrm{CO}_2$ in hexose sugars takes place. $\mathrm{CO}_2$ is primarily fixed by PEP carboxylase because this enzyme has greater affinity to $\mathrm{CO}_2$ than RUBISCO.
RUBISCO is present in bundle sheath cells where final fixation of $\mathrm{CO}_2$ in hexose sugars takes place. $\mathrm{CO}_2$ is primarily fixed by PEP carboxylase because this enzyme has greater affinity to $\mathrm{CO}_2$ than RUBISCO.
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