Abstract: There are two layers of cells in the tunica of the shoot apex of Sesamum indicum and the initiation of leaf primordum originates from the second layer of cells of tunica.The middle layer of laminae is brought about either by submarginal initials of by the first cell of the abaxial layer of mesophyll alone or by both of them.The ability and acting period of cell division in plate meristem increase from abaxial layer mesophyll to adaxial one.Among the palisade tissue,spongy tissue and epidermis, the acting period of cell division shows: the palisade tissue is the longest, the spongy tissue is longer,and the epidermis is the shortest.The laminae of Sesamum indicum has a layer palisade tissue cells, and has 3-4 layers spongy tissue cells.The strong water logging-resistant varieties have bigger intercellular spaces in mesophyll tissue than the weak water logging-resistant varieties.

Key words: Sesamum indicum, Laminae, Development, Initial cell

CLC Number: 

• S565.3