The shoot apical meristem and development of vascular architecture
The shoot apical meristem and development of vascular architecture
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DOI：
10.1139/b06-126
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发表时间：
2006-11-01
期刊：
影响因子：
--
通讯作者：
Dengler, Nancy G.
中科院分区：
文献类型：
--
作者：
Dengler, Nancy G.
顶端分生组织(SAM)的功能是产生外部结构和内部组织模式，以及维持干细胞样细胞的自我永久化群体。维管系统的内部三维结构与侧面器官或叶序的外部排列密切相关。本文综述了双子叶植物和拟南芥属植物的这种对应关系。海因，具体地说。分析部分基于III类同源结构域-亮氨酸拉链转录因子拟南芥同源盒基因8(ATHB8)的表达模式，ATHB8是血管发育的前形成层和前形成层阶段的标志，以及识别血管组织模式的解剖学标准。叶序与成熟组织中维管模式之间的密切对应关系出现在发育的早期阶段，至少是在叶原基生长的第一个造型体上。目前的文献提供了一个综合模型，在该模型中，生长素浓度的局部变化既调节了SAM上原基的形成，也调节了原基叶迹位置上的原形成层前模式的第一个迹象，以及在叶脉模式的形成过程中。将这一模型扩展到枝条复杂的三维维管结构的发展是很有前途的。
The shoot apical meristem (SAM) functions to generate external architecture and internal tissue pattern as well as to maintain a self-perpetuating population of stem-cell-like cells. The internal three-dimensional architecture of the vascular system corresponds closely to the external arrangement of lateral organs, or phyllotaxis. This paper reviews this correspondence for dicotyledonous plants in general and in Arabidopsis thaliana (L.) Heynh., specifically. Analysis is partly based on the expression patterns of the class III homeodomain-leucine zipper transcription factor ARABIDOPSIS THALIANA HOMEOBOX GENE 8 (ATHB8), a marker of the procambial and preprocambial stages of vascular development, and on the anatomical criteria for recognizing vascular tissue pattern. The close correspondence between phyllotaxis and vascular pattern present in mature tissues arises at early stages of development, at least by the first plastochron of leaf primordium outgrowth. Current literature provides an integrative model in which local variation in auxin concentration regulates both primordium formation on the SAM and the first indications of a procambial prepattern in the position of primordium leaf trace as well as in the elaboration of leaf vein pattern. The prospects for extending this model to the development of the complex three-dimensional vascular architecture of the shoot are promising.