关键词: 马占相思, 种皮结构, 明线

Abstract: The seed coat of Acacia mangium was investigated by light and scanning electron microscopy. The testa comprises a palisade epidermis, an osteosclerid layer and a thick-walled parenchyma with lignified walls, a thin cuticle covering a pectinaceous subcuticular layer which together form the outer covering of the layer of palisade cells. It is indicated that the impermeability barrier lies in the palisade layer, and suggested that light line zone situated on the outer ends of the palisade is surrounded by a compact layer of cellulous, which is probably responsible for the optical phenomenon known as the light line.

Key words: Acacia mangium, Seed coat anatomy, Light line