describe Kranz anatomy
Answers
Explanation:
The word Kranz means “wreath” or “ring”. Kranz anatomy is a specialized structure in C4 Plants where the mesophyll cells are clustered around the bundle-sheath cells in a ring-like fashion. The number of chloroplasts in the bundle-sheath cells is more than that in the mesophyll cells. This is found in C4 grasses such as maize and a few dicots. The Kranz anatomy is developed in three different steps:
Initiation of procambium
Bundle sheath and mesophyll cell specification
Chloroplast development and integration of the C4 cycle
The light-dependent reactions and the Calvin cycle are separated in the C4 plants. The Calvin cycle occurs in the bundle-sheath cells and the light-dependent reactions occur in the mesophyll cells.
The atmospheric oxygen is fixed first to form 4-carbon compound oxaloacetate in the mesophyll cells, catalyzed by PEP carboxylase.