互花米草、狐米草和大绳草茎秆的比较解剖观察

互花米草、狐米草和大绳草的表皮均由长细胞、短细胞(栓质细胞和硅质细胞)、盐腺和气孔器组成。它们成纵行交互排列。盐腺的结构与大米草相似,但三个种的盐腺和气孔器的数目不同,尤其以大绳草最多。它们的内部结构是由气道、不同大小的维管束、基本组织以及厚壁组织组成。然而,维管束的数目及厚壁组织的发育各不相同。狐米草和大绳草有高度木质化的厚壁组织细胞,而互花米草的厚壁组织木质化较弱。大绳草的维管束多于其他两种。

AN ANATOMICAL STUDY ON THE CULM OF SPARTINA ALTERNIFLORA,S.PATENS AND S.CYNOSUROIDES

The epidermis of culm of S. alterniflora, S. patens and S. cynosuroides is all made up of long cells, short cells (cork cells and silica cells), salt glands and stomatal apertures. They are arranged alternately in longitudinal rows. The structure of salt glands is similar to that of S.anglica. But the number of the salt glands and the stomatal apparatus is different in these three species, especially, they are more abundant in S.cynosuroides than the others. Their internal structures consist of air passages, vascular bundles of various size, ground tissues and sclerenchyma. However, the number of vascular bundles and the development of sclerenchyma are not uniform with each other. Both of S.patens and S.cynosuroides have highly lignified sclerenchyma cells. In contract, the sclerenehyma cells in S.alterniflora have little lignification. The vascular bundles of S.cynosuroides are more than the others.