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Architecture of Infection Thread Networks in Developing Root Nodules Induced by the Symbiotic Bacterium Sinorhizobium meliloti on Medicago truncatula1[W]

机译:苜蓿中共生细菌Sinorhizobium meliloti诱导的根瘤发育中的感染线程网络架构[W]

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摘要

During the course of the development of nitrogen-fixing root nodules induced by Sinorhizobium meliloti on the model plant Medicago truncatula, tubules called infection threads are cooperatively constructed to deliver the bacterial symbiont from the root surface to cells in the interior of the root and developing nodule. Three-dimensional reconstructions of infection threads inside M. truncatula nodules showed that the threads formed relatively simple, tree-like networks. Some characteristics of thread networks, such as branch length, branch density, and branch surface-to-volume ratios, were remarkably constant across nodules in different stages of development. The overall direction of growth of the networks changed as nodules developed. In 5-d-old nodules, the overall growth of the network was directed inward toward the root. However, well-defined regions of these young networks displayed an outward growth bias, indicating that they were likely in the process of repolarizing their direction of development in response to the formation of the outward-growing nodule meristem. In 10- and 30-d-old nodules, the branches of the network grew outward toward the meristem and away from the roots on which the nodules developed.
机译:在模型植物苜蓿苜蓿(Medicago truncatula)上由中华根瘤菌(Sinorhizobium meliloti)诱导的固氮根瘤发育过程中,协同构建了称为感染线的细管,以将细菌共生体从根表面传递到根内部的细胞中,并形成根瘤。 。截形衣原体结核内感染线的三维重建表明,这些线形成了相对简单的树状网络。线状网络的某些特征,例如分支长度,分支密度和分支表面体积比,在不同发育阶段的整个结节中都非常恒定。随着结节的发展,网络的总体发展方向发生了变化。在5天大的结节中,网络的整体生长向内指向根。但是,这些年轻网络的界限分明的区域显示出向外的生长偏向,表明它们可能正在响应于向外生长的结节分生组织的形成而重新极化其发展方向。在10和30 d的根瘤中,网络的分支朝着分生组织向外生长,并远离根瘤的根部。

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