These cell files form gradients of cell differentiation as cells acquire more differentiated characteristics the further away they move from the cambium. We are interested in genes that regulate the various aspects of wood development. Our topic is an example of a plant developmental problem. Plants have probably evolved a multicellular, terrestrial life style independently from animals. Therefore, it is interesting to investigate the molecular basis of this unique developmental strategy.
Wood is an example of a plant conductive tissue, vascular tissue.
There is quite an impressive diversity in the morphology of vascular tissue representing various plant forms. Plants are classified based on this morphology, indicating its important position in the evolution of land plants. Evolution of proper vascular tissue was a prerequisite for diversification of plant kingdom. Wood represents a climax of this evolution process. The thick cell walls of tracheary elements of wood provide both the strength and conductive properties required for a tree like life form dominating in many areas of earth.