摘要
薄切片研究表明,枳〔Poncirus trifoliata(L.)Raf.〕的分泌囊原始细胞团起源于表皮下的薄壁组织。通过原始细胞间中层分离成小腔,相邻细胞壁进一步分离使腔隙扩大,周围细胞分化为分泌细胞和鞘细胞。枳果实、茎和叶内成熟的分泌囊均由2—5层鞘细胞和2—3层分泌细胞围绕腔隙构成。腔隙四周的细胞始终保持完整。用不同的固定剂、包埋剂和切片方法对枳、甜橙(CitTussinensis(L.)Osbeck)和柑桔(Citrus,reticulata Blanco)内分泌囊的研究结果不同。研究认为,芸香科植物分泌囊的发育方式普遍为裂生型。
Light microscopical observation of thin sections revealed that the initials of secretory cavities in Poncirus trifoliata (L.) Raf. originated from parenchyma cells below the epidermis in early stages of development. The cavity lumen appeared in the center of the initials and gradually en- larged during subsequent development. Concurrently the cells surrounding the central space differ- entiated into secretory cells and sheath cells. The developed cavities of fruit,stem and leaf consist- ed of 2--5 layers of sheath cells and 2--3 layers of secretory cells surrounding a spherical space. The secretory cells lining the space were observed to remain intact throughout the plant′S life. On the basis of comparative studies with the aid of difforent kinds of fixatives,embedding media and sectionings,it was suggested that the manner of formation of the lacunae of secretory cavities in fruit peels of P. trifoliata, Citrus reticulata and C, sinensis were different. However,as seen in thin sections the secretory cavities of all the 3 species developed schizogenously. Our result with refer- ence to views of other authers concluded the existance of a common schizogenous cavity forma- tion in Rutaceae.
关键词
枳
分泌囊
结构
发育
Poncirus trifoliats
Secretory cavity
