POLYCENTRIC VASCULAR RAYS IN SUAEDA-MONOICA AND THE CONTROL OF RAY INITIATION AND SPACING
POLYCENTRIC VASCULAR RAYS IN SUAEDA-MONOICA AND THE CONTROL OF RAY INITIATION AND SPACING
复制标题
DOI：
10.1007/bf00225331
复制
发表时间：
1991-01-01
影响因子：
2.3
通讯作者：
ALONI, R
中科院分区：
文献类型：
--
作者：
LEVYADUN, S;ALONI, R
碱蓬早期形成的木质部。得自J.F. Gmel（藜科）是暂时无射线。 维管射线在其木质部个体发育的后期分化。 碱蓬属的射线是异质的，有些射线是聚集的。 本种成熟木质部的特征是两种独特类型的维管射线：（1）射线与几个内部的起始“中心”的小细胞形成的局部频繁的细胞分裂在形成层中，和（2）巨大的木质部射线与径向韧皮部链连接到轴向韧皮部。 木射线间距不均匀，并讨论了控制射线间距的可能机制。 我们的观察表明，射线没有一个抑制区，在他们周围的射线启动被阻止。 小细胞的放射状图案的开始出现在一个大的血管射线内的“射线”内，表明射线的开始和间隔是由与轴向信号通量相关的径向信号流控制的。
The early-formed xylem of Suaeda monoica Forssk. ex J. F. Gmel (Chenopodiaceae) is temporarily rayless. Vascular rays differentiate during later stages of its xylem ontogeny. The rays in Suaeda are heterogeneous, and some of them are aggregated. The mature xylem of this species is characterized by two unique types of vascular rays: (1) rays with several inside initiation "centres" of small cells formed by local frequent cell divisions in the cambium, and (2) huge xylem rays with radial phloem strands that are connected to the axial phloem. The spacing of the xylem rays is not even, and possible mechanisms controlling ray spacing are discussed. Our observations indicate that rays do not have an inhibitory zone around them in which ray initiation is prevented. The initiation of radial patterns of small cells which appear like inside "rays" within a large vascular ray suggests that initiation and spacing of rays is controlled by radial signal flows in relationship with axial signal fluxes.