Figure 2.

Lateral root development. (I) Lateral root initiation—Anticlinal division of lateral root founder cells in the pericycle; (II) Outer and inner cell layers are formed by periclinal divisions; (III) Periclinal divisions of the outer layer makes dome shape of the LRP is apparent (three-layered); (IV) As a result of periclinal divisions the primordium becomes four-layered; (V) After anticlinal divisions, the primordium begins to push through the cortex of the primary root; (VI) Different cell types are being formed; (VII) Lateral root meristem is established and primordium enlarges; and (VIII) Primordium is about to emerge after which the lateral root meristem will be activated (Based on Malamy and Benfey, 1997 [7]).