  This article presents formalistic tool for description of structural and
biochemical relations between cells in the course of development of the body of
plants. This is flexible formalistic space, based on the Category theory and
the Petri Net approach, which embeds and mutually supplements biological data
from methodically different sources. Relation between functional and
morphological ways of plant description was mathematically realized with help
of the adjoint functors. It was shown that histology and proliferative activity
of the formative tissues give a template for the gene interaction networks.
