波温苏铁(Bowenia spectabilis)营养器官的解剖结构研究

The Anatomy of Vegetative Organs of Bowenia spectabilis Hook.ex Hook.f

报道了波温苏铁(BoweniaspectabilisHook.exHook.f)根、茎、叶的解剖结构。根的初生结构由表皮、皮层和中柱三部分组成,为二原型木质部。茎具大量薄壁组织,薄壁细胞富含淀粉粒,维管束为外韧并生。叶柄中含有5-8束维管束,呈弧形排列。羽片叶角质层厚,有小叶脉产生,气孔主要分布在下表皮。根、茎、叶木质部中的管胞主要是螺纹和孔纹管胞,有少量纤维分化;茎中管胞的侧壁呈现凹凸不平,部分管胞具有分枝或分叉现象。

The anatomy of the roots, stems and leaves of Bowenia spectabilis Hook. ex Hook. f were studied. The primary structure of roots consists of epidermis, cortex and stele. Primary xylem is diarch. There are a large number of parenchyma cells with abundant starch grains in stems. The vascular bundles are collateral bundle. There are 5-8 vascular bundles in petioles and arranged in the shape of arch. Cuticle of the upper epidermis is thicker than that of the lower one, and stomata are restricted to the lower epidermis. There are small veins in mesophyll of pinnae. The xylem in roots, stems and leaves mainly consists of spiral and reticulated or pitted tracheids, and small amount of fibers. The tracheid wall in stems appears convexo-concave, and some tracheids are forked or branched.