墨兰的解剖学研究

Anatomy of Cymbidium sinense(Andr.)Willd.

运用石蜡切片法和扫描电镜技术,对墨兰营养器官和生殖器官进行了研究。结果表明墨兰叶片表面具较厚的角质层。气孔多为四轮列型,分布在下表皮。叶肉没有海绵组织和栅栏组织的分化,但叶尖部和叶中部中脉附近的叶肉细胞常伸长,类似栅栏组织细胞。平行脉,外韧型维管束。在假鳞茎中,维管束散生在基本组织中。根具根被、皮层和维管柱三部分。花被各部分基本结构均相似。唇瓣和合蕊柱的表皮为腺表皮,具花柱道。三心皮雌蕊,一室,侧膜胎座。四合花粉,表面无纹饰。蒴果。

The vegetative and propagative organs of Cymbidium sinense were studied by paraffin method and observed under scanning elect ron microscope. The results show that leaf surfaces of Cymbidium sin ense are covered with cuticle. The stomata with tetracyclic type are found t o distribute in the abaxial epidermis. The mesophyll is not differentiated into spongy and palisade tissues, but mesophyll near midrib in tip and middle parts o f leaf is often lengthened to appear as palisade-liked tissue. Vascular bundles of leaf with parallel venation are collateral bundles. Vascular boundles in pseu dobulb are scattered in ground tissue. In cross section view, from outer to inne r part, root includes velamen, cortex, and vascular cylinder. Basic structure of each part of perianth is similar to each other and is composed of epidermis, gr ound tissue and vascule bundle. Epidermis of lip and column are glandular epider mis, with a stylar canal in column. Tricarpous pistil has one-locular ovary with parietal placentation. Tetrads have no ornamentation in appearance. A capsule f ruit.