Plasmodesmata: Dynamics, Domains and Patterning
Plasmodesmata: Dynamics, Domains and Patterning
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DOI：
10.1006/anbo.1997.0522
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发表时间：
1998
期刊：
影响因子：
4.2
通讯作者：
F. Kragler;W. J. Lucas;J. Monzer
中科院分区：
文献类型：
--
作者：
F. Kragler;W. J. Lucas;J. Monzer
摘要 尽管人们早已知道胞间连丝在植物体内的大多数细胞之间建立了细胞质连续性，但直到最近这些特殊结构才被视为参与大分子运输的动态细胞间细胞器（Lucas 和 Wolf，Trends in Cell Biology 3：308-315，1993）。超微结构研究提供了关于胞质分裂过程中胞间连丝（初级胞间连丝）和细胞动力学后事件（其中新的细胞质桥插入现有壁内（次级胞间连丝））形成的重要信息。对胞间连丝频率和大概组成的修改可能反映了共质连续性/通讯的发育和生理要求。对病毒运动蛋白的开创性研究提供了第一个直接的实验证据，表明蛋白质和蛋白质-核酸复合物可以通过胞间连丝在细胞之间运输。这些知识为内源性蛋白质的鉴定和表征铺平了道路，这些蛋白质也具有类似的细胞间运输能力。此类蛋白质的范围从参与植物发育协调的植物转录因子到被子植物韧皮部汁液中存在的蛋白质（可能参与去核筛管系统的维护）。来自病毒感染研究和植物发育的信息支持这样的概念，即胞间连丝在发育和生理领域的形成中发挥重要作用，在这些领域中，大分子的调节运输建立了非细胞自主控制网络。最后，从提供控制细胞分化的新方法方面讨论了信息分子胞间连丝运输的作用。使用当前关于根毛和毛状体图案形成的知识来说明这个概念。
Abstract Although it has long been known that plasmodesmata establish cytoplasmic continuity between most cells within the body of the plant, it is only recently that these special structures have been viewed as dynamic intercellular organelles (Lucas and Wolf, Trends in Cell Biology 3 : 308–315, 1993) involved in the transport of macromolecules. Ultrastructural studies have provided important information on the formation of plasmodesmata during cytokinesis (primary plasmodesmata) and as post-cytokinetic events, where the new cytoplasmic bridges are inserted within the existing wall (secondary plasmodesmata). Modifications to plasmodesmal frequency, and presumably composition probably reflect developmental and physiological requirements for symplasmic continuity/communication. Pioneering studies on viral movement proteins provided the first direct experimental evidence that proteins and protein-nucleic acid complexes could traffic cell to cell, via plasmodesmata. This knowledge paved the way for the identification and characterization of endogenous proteins that also possess a similar capacity for cell-to-cell transport. Such proteins range from plant transcription factors, involved in orchestration of plant development, to proteins present in the phloem sap of angiosperms which are probably involved in maintenance of the enucleate sieve tube system. Information from viral infection studies and plant development support the concept that plasmodesmata play an essential role in the formation of developmental and physiological domains in which regulated trafficking of macromolecules establishes a non-cell-autonomous control network. Finally, the role of plasmodesmal trafficking of informational molecules is discussed in terms of providing a novel means for controlling cell differentiation. This concept is illustrated using current knowledge on root hair and trichome pattern formation.