Apical cells as meristems
Apical cells as meristems
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顶端细胞作为分生组织
DOI：
10.1007/bf00712165
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发表时间：
1993
影响因子：
1.3
通讯作者：
R. Korn
中科院分区：
文献类型：
--
作者：
R. Korn
顶端细胞普遍存在于低等植物中，在形态上大多被认为是单细胞分生组织。这项研究试图证明顶端细胞和更一般的分生组织的共同作用是：(A)通常是植物所有细胞的增殖源，(B)有时是组织发生和器官发生的形成中心，(C)总是一个调节部位。作为一个增殖中心，它以一系列顶端细胞的形式出现，通过不平等的分裂形成有丝分裂谱系，其中包括旋转模式，形成根据其器官的对称性分布的细胞。作为形成中心，它决定苔藓和多叶地钱植物的叶排列，以及蕨类植物的根冠和配子体垫层。它最初似乎决定器官的类型，后来器官决定其中顶端细胞的类型。作为一个调节中心，它激活远端次生细胞增殖，并抑制相邻细胞成为顶端细胞，以保持器官发育过程中的特性。根据顶端细胞可被识别的这三个角色，可以起草一种论点，即种子植物可能具有顶端细胞，尽管在形态上与其他细胞没有区别，单一地或在电池中，而不是拥有传统所描述的多细胞分生组织。
Apical cells are universally present in lower plants and their description has been mostly viewed morphologically as single-celled meristems. This study attempts to demonstrate that the roles of apical cells and more generally of meristems collectively are (a) often the proliferative source of all cells in a plant, (b) sometimes a formative centre in histogenesis and organogenesis and (c) always a regulatory site. As a proliferative centre it occurs as a series of apical cells through a mitotic lineage by unequal divisions which includes a rotational pattern to form cells distributed according to the symmetry of its organ. As a formative centre it determines leaf arrangement in mosses and leafy liverworts as well as the root cap and gametophyte cushion in ferns. It appears initially to determine the type of organ and later the organ determines the type of apical cells within. As a regulatory centre it activates distal secondary cells to proliferate as well as inhibiting neighbouring cells from becoming apical cells to preserve the identity of an organ during its development.Based on these three roles by which apical cells can be recognized an argument can be drafted that seed plants may have apical cells, although morphologically indistinguishable from other cells, singularly or in batteries instead of possessing the traditionally described multicellular meristems.