两种蕨类植物孢子囊柄的结构观察

Anatomical Study on the Pedicels of Two Ferns

孢子囊柄是蕨类植物孢子囊与叶片的连接结构,但其形态结构和功能并不完全清楚。本文作者在观察维明鳞毛蕨(Dryopteris zhuweimingii)和东方荚果蕨(Pentarhizidium orientale)孢子囊柄的结构时发现:(1)两者的孢子囊柄都由3列细胞组成;(2)两者孢子囊柄的细胞壁可明显分为内外两层,内层为次生细胞壁的S1层,呈螺旋状紧密排列,紧贴外壁但容易分离;外层为初生细胞壁。这一结构对支持和保护孢子囊具有重要意义。

Pedicel is a stalk connecting sporangia with frond in ferns, and its structure and function are not clear. In this paper, we studied the pedicels of Dryopteris zhuu,eimingii and Pentarhizidium orientale. We found that the pedicels consist of three lines of ceils, and the cell wall can he separated into two layers. The inner layer is secondary cell wail （ S1 ） that spiral and cling to the outer layer. The outer layer is primary cell wall. And when we broke the pedicel into two sections, the inner layer of the cell wall could be pulled out like a spiral belt. This structure may be important to support and protect the sporangia.