MORPHOGENESIS OF GLANDULAR HAIRS ON THE LEAVES OF PERILLA FRUTESCENS (L. ) BRITTON

The leaves of Perilla frutescens (L.) Britton beared two types of glandularhairs,peltate and capitate, which comprised one hasal cell,one stalk cell and one head.The head of peltate glandular hairs consisted of one,two, four or eight secretory cellsand was peltate--shaped while that of capitate glandular hairs was composed of one,two,or four secretory cells and was globose-shaped.The initial cells of both types of glandular hairs originated from the protodermal cells and created a hasal cell,a stalk cell and anapical cell through two successive periclinal divisions.During the late stage of the morphogenesis of glandular hairs,the type of glandular hairs was affected by the differentiation degree of the stalk cell.The apical cell would develop into the head cells of peltateglandular hairs if the stalk cell kept meristematic and flat-shaped.The apical cell woulddevelop into the head cells of capitate glandular hairs if the stalk cell rapidly enlargedlongitudinally and was of vacuolization.