THE DIFFERENCE BETWEEN OPEN AND CLOSED MERISTEMS
THE DIFFERENCE BETWEEN OPEN AND CLOSED MERISTEMS
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DOI：
10.1093/oxfordjournals.aob.a086183
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发表时间：
1981-01-01
期刊：
影响因子：
4.2
通讯作者：
CLOWES, FAL
中科院分区：
文献类型：
--
作者：
CLOWES, FAL
一个开放的和一个封闭的根分生组织进行了比较，通过调查的细胞动力学的小区域的顶端向日葵和玉米。两者的中柱极细胞均处于静止状态，中柱与皮层、中柱与帽之间无细胞交换。在闭合分生组织（玉米）中的直接远端细胞也是静止的，并且确实发生的少数分裂可以是横向的或纵向的。在开放的分生组织（向日葵）中，这些细胞不是静止的，但它们会短暂地脱离周期，延长潜在的细胞倍增时间。他们的分工是横向的。这是一个结果，这些差异，封闭的分生组织形成根冠离散的皮质，而开放的分生组织力之间的边界不稳定的帽和皮质的外围部分。开放分生组织的根的另一个结果是，在近端细胞层的非循环阶段，由于分生组织中的流动状态，一系列的柱复合体横向相互移位，这些复合体直接位于中柱极的远端。个体发生开始的静止和开关之间的分生组织的开放和关闭操作的证据进行了讨论。
An open and a closed root meristem were compared by investigating the cell kinetics of small regions of the apices of Helianthus annuus and Zea mays. The cells of the stelar pole are quiescent in both and there is no exchange of cells between stele and cortex or stele and cap. The immediately distal cells in the closed meristem (Zea) are also quiescent and the few divisions that do occur can be transverse or longitudinal. In the open meristem (Helianthus), these cells are not quiescent, but they go out of cycle transiently, prolonging the potential cell-doubling time. Their divisions are transverse. It is a consequence of these differences that closed meristems form root caps discrete from the cortex whereas open meristems force instability in the boundary between the peripheral part of the cap and the cortex. Another consequence in roots with open meristems is a succession of columella complexes transversely displaced from each other by the state of flux in the meristem during the non-cycling phase of the proximal tier of cells, those immediately distal to the stelar pole. The ontogenetic onset of quiescence and the evidence for switches between open and closed operation of meristems are discussed.