摘要
荇菜 (Nymphoides peltatum (Gmel.) O.Kuntz)腺毛由具分泌功能的单列圆筒状细胞组成。它们起源于苗端倒数第二叶原基近轴面 ,由原表皮细胞发育而来。处于分泌期的腺毛细胞其胞质浓厚 ,液泡化程度小。细胞内具丰富的线粒体、高尔基体和内质网等细胞器 ,还具发达的胞间连丝。粘液物质由高尔基体分泌小泡、内质网分泌小泡及多膜体共同携带至细胞边缘 ,经胞吐和渗透相结合的方式分泌至细胞外。腺毛细胞侧壁因积有大量分泌物而呈膨胀状态。经检测 ,粘液由多糖和蛋白质组成 ,对营养芽的生长发育起保护作用。
Each glandular hair of Nymphoides peltatum (Gmel.) O. Kuntz consisted of only one row of cylindar cells with secretory function. The hairs originated from the protoderm cells on the adaxial surface of the second leaf primordium from the shoot apex.Cells of the glandular hairs prossessed dense cytoplast during the secretory period,but the vacuoles were very small. There were not only abundant mitochondria, Golgi bodies and endoplasmic reticulum in the glandular hair cells, but also many plasmodesmata. The authors research indicated that the mucilage was carried to the edge of the cells by the membranous multilamellar bodies and the vesicles from both Golgi bodies and endoplasmic reticulum. The mucilage was secreted extracellularly by either exocytosis or ecrine secretion. The side walls of the glandular hairs swelled because of mucilage mass accumulation in the walls. The mucilage,being tested to be composed of polysaccharides and a trace of protein, played an important role in protecting the development of the vegetative buds of N.peltatum.
基金
江苏省教委自然科学基金资助项目
关键词
龙胆科
荇菜
腺毛
发育
分泌
超微结构
Nymphoides peltatum
Glandular hair
Development
Secretion
Ultrastructure
