文档介绍：Lot. Mag. Tokyo 90: 129—141 1977
Anatomical Study on the Shoot Apex of Osmunda japonica Thunb.
关于紫萁枝条尖的解剖研究
RYOKO JMAIcHI*
Depart ,eent of Biology, Faculty of Science, Ockanomizu University, Oktsuka, Bunkyo-ku, Tokyo 112
The ic and seasonal variations in anization of the shoot apical meristem of Osmunda japonica Thunb. were investigated. The meristem posed of an apical segmentation zone (SZ), a mother cell zone of the stele (MS) and a peripheral zone (PZ). A single apical cell is mostly discernible in all seasons throoghout the whole process of ontogeny observed in the present study. The apical cell is usually four-sided, nearly triangular, with a regular segmentation pattern in transverse view. However, it is sometimes accurately three-sided with a highly regular segmentation pattern in the active season, while it is often four-sided, nearly trapezoid or five- or six-sided, with a less regular segmentation pattern in the inactive season. The size of the apical cell represented by its free surface area increases with the increase in size of the plant body in the young plants. However, in the adolt plants, the size of the apical cell is smaller in the active season and larger in the dormant season. anization pattern of the shoot apical meristem of 0. joponica does not show an intermediate type between the eusporangiate and the leptosporangiate ferns, but the leptosporangiate fern type.
对于紫萁枝条顶端分生组织的介体娄生和季节变异的机体形成过程我们已有所了解。其分生组织包括顶端分节区域(SZ),中柱的母细胞区域(MS)和外周区域(PZ)。在目前的研究中指出单个顶端细胞在个体发生整个过程的各个时期大部分可被识别。在横向视野中顶端细胞通常是接近三角形的四边形,具有一个规律性的分节模式。然而,有时候它会是具有高度规律分节模式的标准三边形在生长活跃期,在生长不活跃的时期它又经常是四边形,接近梯形或五边六边形,并罕有规律分节模式。在幼年植物中,顶端细胞的大小是由它的自由表面积随着植物体大小的增长而增长来表现的。然而,在成年植物中,顶端细胞的大小在生长活跃期会变小,在休眠期会变大。紫萁的枝条顶端分生组织的构成模式不能说明它是存在于厚囊蕨类和薄囊蕨类之间的中间型,而是属于薄囊蕨类植物。
Shoot apical patterns in pteridophytes have aroused a renewed interest in recent years in regard to the zonation and tissue differentiation within the apical meristem (McAlpin and White, 1974; Hébant-Mauri, 1975) and to the activity of