烟草花蜜腺发育的解剖学研究

烟草的花蜜腺位于子房基部 ,围绕子房 ,属于子房蜜腺。蜜腺由分泌表皮和泌蜜组织组成 ,分泌表皮角质膜厚薄不匀 ,表皮上分布少量气孔器 ,气孔凹陷 ,孔下室不明显 ,泌蜜组织细胞多层。蜜腺邻接子房壁维管束 ,本身没有维管组织。蜜腺由子房基部的外壁表皮及其相邻的内侧细胞经分裂、生长、分化而来 ,在发育过程中 ,细胞中的液泡和淀粉粒都呈现一定的消长规律。原蜜汁由子房壁维管束提供 ,经过泌蜜组织细胞加工后 ,蜜汁通过气孔和薄的角质膜处泌出。

Anatomical studies on the development of thefloral nectary of Nicotiana tabacum

The floral nectary of Nicotiana tabacum is at the base of the ovary. It belongs to ovarial nectary. The nectary is composed of secretory epidermis and nectariferous tissue with no vascular bundles in it. The secretary epidermis is of one layer of cells. Cuticle which is on the surface of the cells is not well-distributed. Only small amount of stoma appratus scatter in it and their chamber is comparatively smaller. The nectariferous tissue is of many layers of cells. At early time of bud,the divission growth and differentiation of the cells of ovarial outer epidermis and its adjacent inner side result in the formation of folral nectary. During the development,the vacuoles and the amount of starch in the cells of nectary take on regular changes. Pre-nectar is provided by the vascular bundles in ovarial wall. Nectar formed in nectariferous tissue is secreted through the stomata and thin cuticle.