Describe C₄ path way

* C₄ plants exhibit c4 cycle. In this first formed product is oxaloacetic acid (OAA).
* In c₄ plants bundle sheath cells show "kranz anatomy".
* The primary aceptor of CO₂ is PEP (phosphoenol pyruvate) in mesophyll cells.
$\mathrm{PEP}+{\mathrm{Co}}_2\stackrel{\mathrm{PEPcase}}{\to }\mathrm{OAA}+\mathrm{Pi}$
* Later malic acid is formed from OAA in chloroplast of mesophyll cells.
$\mathrm{OAA}+\mathrm{NADPH}+{\mathrm{H}}^{+}\stackrel{\mathrm{Malic}enzyme}{\to }\text{ Malicacid }+{\mathrm{NADP}}^{+}$
* After entering of malic acid into bundle sheath cells, it forms pyruvicacid and CO₂.
$\text{ malicacid }\stackrel{\mathrm{breakdown}}{\to }{\mathrm{Co}}_2{+}_{\left(3\mathrm{c}\right)}\text{ pyruvicacid }$
* The pyruvic acid again goes into mesophyll cells and convert into PEP. CO₂ enters into calvin cycle.