Sobotnik J, Weyda F
Institute of Organic Chemistry and Biochemistry, Flemingovo nám. 2, Praha 6, CZ-166 10, Czech Republic.
Arthropod Struct Dev. 2003 Apr;31(4):255-70. doi: 10.1016/S1467-8039(03)00002-1.
The labial glands in Prorhinotermes simplex consist of secretory cells organized into acini, water sacs and the ducts connecting the gland parts to the basis of the labium. Acini are composed of central and parietal cells. Central cells type I contain predominantly lucent vacuoles and are involved probably in hydroquinone production. They are lacking in soldiers. Type II central cells produce vacuoles of proteinaceous content which are of the same electron density (type IIa) or present in more shades (type IIb). Type IIa cells are present in all older individuals, whereas type IIb are lacking in soldiers and neotenics. Type III cells represent a specific stage of type I cells development, but they are definite functional secretory cells in soldiers. Acini of first instar larvae contain undifferentiated cells which differentiate into type I cells during the second instar. Specific larval central cells start to change into type II cells during first instar. The central cells of presoldiers show a transition from the pseudergate into the soldier situation. The parietal cells keep a uniform structure throughout the whole ontogeny. Only one type of cells form the water sacs in all castes. The cells are very flat with scarce organelles. The water sac cells produce lipid-like secretion, small lucent vacuoles and bunches of angulated vacuoles. The water sac probably functions as water storage organ only. Ontogenetical changes in water sac development are small. The acinar ducts originate inside the acinus where they are formed by flat cells with rare organelles. At the acinus border, cells equipped with mitochondria, microvilli and basal invaginations appear. The water sac ducts are formed by flat cells with rare organelles. Acinar ducts outside the acinus and water sac ducts are equipped with taenidiuam.
简单原鼻白蚁的唇腺由组成腺泡的分泌细胞、水囊以及将腺体各部分连接到唇基部的导管构成。腺泡由中央细胞和壁细胞组成。I型中央细胞主要含有透明液泡，可能参与对苯二酚的产生。兵蚁中没有这种细胞。II型中央细胞产生含有蛋白质的液泡，这些液泡具有相同的电子密度（IIa型）或呈现更多种色调（IIb型）。IIa型细胞存在于所有较年长的个体中，而IIb型细胞在兵蚁和幼态持续个体中不存在。III型细胞代表I型细胞发育的一个特定阶段，但它们是兵蚁中明确的功能性分泌细胞。一龄幼虫的腺泡含有未分化细胞，这些细胞在二龄时分化为I型细胞。特定的幼虫中央细胞在一龄时开始转变为II型细胞。预兵蚁的中央细胞显示出从拟工蚁状态向兵蚁状态的转变。壁细胞在整个个体发育过程中保持统一的结构。所有品级中只有一种类型的细胞形成水囊。这些细胞非常扁平，细胞器稀少。水囊细胞产生类脂分泌物、小的透明液泡和成束的有角液泡。水囊可能仅作为储水器官发挥作用。水囊发育过程中的个体发育变化很小。腺泡导管起源于腺泡内部，由细胞器稀少的扁平细胞形成。在腺泡边界，出现了配备线粒体、微绒毛和基底内陷的细胞。水囊导管由细胞器稀少的扁平细胞形成。腺泡外部的腺泡导管和水囊导管都有螺旋丝。
