生长素在内皮层和中柱鞘之间的回流促进了侧根的起始。
Auxin reflux between the endodermis and pericycle promotes lateral root initiation.
机构信息
Department of Plant Systems Biology, VIB, Gent, Belgium.
出版信息
EMBO J. 2013 Jan 9;32(1):149-58. doi: 10.1038/emboj.2012.303. Epub 2012 Nov 23.
Abstract
Lateral root (LR) formation is initiated when pericycle cells accumulate auxin, thereby acquiring founder cell (FC) status and triggering asymmetric cell divisions, giving rise to a new primordium. How this auxin maximum in pericycle cells builds up and remains focused is not understood. We report that the endodermis plays an active role in the regulation of auxin accumulation and is instructive for FCs to progress during the LR initiation (LRI) phase. We describe the functional importance of a PIN3 (PIN-formed) auxin efflux carrier-dependent hormone reflux pathway between overlaying endodermal and pericycle FCs. Disrupting this reflux pathway causes dramatic defects in the progress of FCs towards the next initiation phase. Our data identify an unexpected regulatory function for the endodermis in LRI as part of the fine-tuning mechanism that appears to act as a check point in LR organogenesis after FCs are specified.
摘要
侧根 (LR) 的形成是从中柱细胞积累生长素开始的，从而获得创始细胞 (FC) 的状态，并触发不对称细胞分裂，产生新的原基。中柱细胞中生长素最大值的积累方式及其保持集中的方式尚不清楚。我们报告说，内皮层在生长素积累的调节中发挥积极作用，并在 LR 起始 (LRI) 阶段对 FC 的进展具有指导作用。我们描述了重叠的内皮层和中柱 FC 之间依赖 PIN3（PIN 形成）生长素外排载体的激素回流途径的功能重要性。破坏这个回流途径会导致 FC 向下一步启动阶段的进展出现明显缺陷。我们的数据表明，内皮层在 LRI 中具有意想不到的调节功能，作为在 FC 被指定后 LR 器官发生的微调机制的一部分，它似乎充当了一个检查点。
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