Various scenarios of the cell pattern formation in Arabidopsis lateral root

Abstract

During lateral root (LR) development a coordinate sequence of cell divisions, accompanied by a change of the organ form takes place. Both the order of anatomical events and morphological features may vary for individual primordia. At early stages of LR primordia development oblique division walls are inserted in cells that are symmetrically located on both sides of the axis of the developing LR primordium, and thereby allow for the protrusion of the LR. We hypothesize that both oblique cell wall insertion and continuous changes in primordium form could be a consequence of a local change in stress distribution in the region of the LR initiation.

Growth rate distribution in the forming lateral root of arabidopsis

“…Initial anticlinal divisions of the founder cells are followed by periclinal divisions, resulting in the formation of two cell layers (Casimiro et al, 2003). Subsequently, after a more or less co-ordinated series of both periclinal and anticlinal divisions (Malamy and Benfey, 1997;Białek et al, 2014) a meristem resembling that of the parent root is formed. The protrusion grows through tissues of the parental root and eventually emerges through its surface (Malamy and Benfey, 1997).…”

“…This also means that an individual local field of growth arises dedicated to the new LR primordium (Szymanowska-Pułka and Nakielski, 2010). This field is thought to become independent of the growth field of the parent root (Hejnowicz and Hejnowicz, 1991) as early as the occurrence of new oblique cell division walls (Szymanowska-Pułka et al, 2012;Białek et al, 2014), resulting in the establishment of new principal directions of growth (direction in which growth rates attain extreme values; Hejnowicz and Romberger, 1984) within the primordium.…”