【摘要】 田菁的花蜜腺位于雄蕊和子房之间的花托上 ,表面呈规则的条形突起 ,属于花托蜜腺。蜜腺由分泌表皮和泌蜜组织组成 ,不含维管束。分泌表皮为一层长方形细胞 ,表皮上有少量的气孔器 ,孔下室较小 ,泌蜜组织为多层小的多边形细胞。蜜腺由花托表皮及其内侧的细胞发育而来 ,在发育过程中 ,蜜腺细胞中的液泡以及淀粉和蛋白质均呈现出规律性的变化。原蜜由蜜腺相邻的花托维管束提供 ,经过蜜腺细胞加工成蜜汁后 ,通过气孔和相邻表皮细胞的角质膜断裂处泌出更多还原

【Abstract】 The floral nectary of Sesbania cannabina is on the receptacle between stamen and ovary It belongs to receptacular nectary There are ten regular stripes on its surface The nectary is composed of secretory epidermisf and nectariferous tissue with no vascular bundles in it The secretory epidermis is of one layer of rectangle cells Only small amount of stoma apparatus scatter in it and their chamber is smaller The nectariferous tissue is of many layers of small polygon cells At early time of budding,the division,growth and differentiation of the cells of receptacular epidermis and its adjacent inner side result in the formation of floral nectary During the development,the vacuoles,the amount of starch and protein in the cells of nectary take on regular changes Pre-nectar is provided by the vascular bundles of receptacle Nectar formed in nectariferous tissue is secreted through the stomate and crevice of cuticle更多还原