Non-canonical WOX11-mediated root branching contributes to plasticity in Arabidopsis root system architecture.
Non-canonical WOX11-mediated root branching contributes to plasticity in Arabidopsis root system architecture.
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DOI：
10.1242/dev.152132
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发表时间：
2017-09-01
期刊：
影响因子：
--
通讯作者：
Xu L
中科院分区：
文献类型：
--
作者：
Sheng L;Hu X;Du Y;Zhang G;Huang H;Scheres B;Xu L
侧根和不定根是拟南芥胚后根系统的主要组成部分，侧根来源于生长中的根，不定根来源于非根器官。然而，我们的知识是如何形成的根系统的变化，以响应不同的诱导线索是有限的。在这里，我们表明，WOX 11有助于根系可塑性。当幼苗在培养基上垂直生长时，WOX 11在LR创始细胞中不表达。在AR起始期间，WOX 11在AR建立者细胞中表达并激活LBD 16。LBD 16也在LR形成中起作用，并且在该背景下由ARF 7/19而不是由WOX 11激活。这表明，不同的初始过程，导致AR和LR可能会收敛到一个类似的机制为原基的发展。此外，我们证明了当植物在土壤中生长或在培养基上受伤时，初生根能够产生WOX 11介导的和非WOX 11介导的根。WOX 11介导的根衍生的根的发现揭示了一个以前未知的途径，赋予可塑性的根系统架构的产生过程中，响应于不同的诱导线索。总结：根系发育可以灵活地利用WOX 11介导的和非WOX 11介导的途径，包括LBD 16在内的原基发育的共同机制，对发育和环境线索作出反应。
Lateral roots (LRs), which originate from the growing root, and adventitious roots (ARs), which are formed from non-root organs, are the main contributors to the post-embryonic root system in Arabidopsis. However, our knowledge of how formation of the root system is altered in response to diverse inductive cues is limited. Here, we show that WOX11 contributes to root system plasticity. When seedlings are grown vertically on medium, WOX11 is not expressed in LR founder cells. During AR initiation, WOX11 is expressed in AR founder cells and activates LBD16. LBD16 also functions in LR formation and is activated in that context by ARF7/19 and not by WOX11. This indicates that divergent initial processes that lead to ARs and LRs may converge on a similar mechanism for primordium development. Furthermore, we demonstrated that when plants are grown in soil or upon wounding on medium, the primary root is able to produce both WOX11-mediated and non-WOX11-mediated roots. The discovery of WOX11-mediated root-derived roots reveals a previously uncharacterized pathway that confers plasticity during the generation of root system architecture in response to different inductive cues. Summary: Root system development can respond flexibly to developmental and environmental cues by utilizing WOX11-mediated and non-WOX11-mediated pathways, which converge on a common mechanism for primordium development involving LBD16.
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