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首页> 外文期刊>Protoplasma: An International Journal of Cell Biology >Deterministic cellular descendance and its relationship to the branching of plant organ axes
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Deterministic cellular descendance and its relationship to the branching of plant organ axes

机译：确定性细胞下降及其与植物器官轴分支的关系

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A double-wall map L-system, designated as S5-5, was developed to simulate the cellular pattern found at the summit of shoot apices of Psilotum nudum. Commencing from a 3-sided autoreproductive founder cell, fives steps of simulation established a basic set of ten different cell types. Continuing the simulation beyond the fifth step revealed that, in addition to the regular production of new 3-sided cells, a group of autoreproductive 5-sided cells came into being. A close correspondence exists between the cells of the two-dimensional simulation and the two-dimensional cellular patterns found on the epidermis of the apices of Psilotum species. The 3-sided cells produced during the simulation correspond to the potentially organogenetic 3-sided cells that can be seen upon the apical surfaces. Successive generations of these 3-sided apical cells ( which are actually 4-sided tetrahedral cells when viewed in three dimensions) and their immediate descendants are thought to be selected to organise the successive pairs of apices that bring about the repeated bifurcation of the Psilotum shoots. The 5-sided cells contribute to the cellular "pavements" which separate these pairs of organogenetic centres, each with their 3-sided apical cells. The cellular patterns simulated by the S5-5 system may also correspond to the cellular patterns found on the surfaces of some other pteridophyte apices, including that of the rhizophores of Selaginella species. Tritiated-thymidine labelling of rhizophore apices revealed a group of nonproliferating cells that was associated with rhizophore bifurcation and which may correspond to a group of pavement cells. Nonproliferating cells, by regulating the siting of new organogenetic centres, may have evolved as an accompaniment to branching events such as the bifurcation of root and organ axes.
机译：开发了一个名为S5-5的双壁地图L系统，以模拟在裸麦草茎尖顶端发现的细胞模式。从3面自生殖基础细胞开始，五步模拟建立了十种不同细胞类型的基本集合。继续进行第五步以外的模拟，发现除了常规生产新的3面细胞外，还出现了一组自生殖5面细胞。二维模拟的细胞与在韧毛虫物种的表皮上发现的二维细胞模式之间存在密切的对应关系。在模拟过程中产生的3面细胞对应于在根尖表面可以看到的潜在的有机3面细胞。这些3面顶细胞的连续世代（从三维角度看实际上是4面四面体细胞）及其直系后代被认为可以组织连续的顶点对，从而使s骨的芽反复分叉。 5面细胞有助于细胞“铺装”，这些“铺路”将这些成对的中心分开，每个中心都带有3面顶细胞。 S5-5系统模拟的细胞模式也可能对应于一些其他蕨类植物顶点表面上的细胞模式，包括卷柏属植物的根茎表面。根茎尖的啶胸腺嘧啶核苷标记显示了一组与根茎分叉有关的非增殖细胞，可能与一组路面细胞相对应。通过调节新的有机遗传中心的位置，非增殖细胞可能已经进化为分支事件（例如根和器官轴的分叉）的伴生。

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