Role of LBD29 gene in lateral root initiation of Arabidopsis thaliana

The effect of LBD29 gene on diffentiation of pericycle cells and lateral root initiation in Arabidopsis thaliana were investigated using microscopy and electron microscopy.The results showed that:(1)compared with wild-type of Arabidopsis thaliana,lbd29 forms fewer lateral roots in a later period;(2)the pericycle cells in maturation zone of root tip consist of two types of cells in differentiation degree and the pericycle founder cells at xylem pole divide to form lateral root primordium after dedifferentiation;(3)lbd29 pericycle cells are too insensitive to ectohormone to dedifferentiate.Thus,LBD29 may affect lateral root initiation by regulating dedifferentiation and division via auxin response pathway.