Abstract
Previous researches showed that genes expressed in the adaxial or the abaxial region are important for lateral growth of a leaf. However, it is still unclear how their expression pattern is regulated and how lateral growth of a leaf is controlled.
It is reported that the PRS gene, one of the WOX family genes, is specifically expressed in marginal region of an early-stage leaf primordia. We previously demonstrated that PRS and WOX1 redundantly function lateral growth and development of marginal tissues.
We showed that WOX1 is expressed in the marginal region of the early-stage leaf primordia and in cells at the adaxial-abaxial boundary of the later-stage leaf primordia. The marginal region corresponds to the epidermis located at the adaxial-abaxial boundary. In addition to the marginal tissues prs wox1 double mutant show abnormal phenotype in leaf vein patterning. Leaf vein is formed along the adaxial-abaxial boundary. These results suggest that PRS and WOX1 are expressed in the adaxial-abaxial boundary and involved in lateral growth and development of adaxial-abaxial boundary tissues.
