The pillars of land plants: new insights into stem development.

The pillars of land plants: new insights into stem development.
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DOI:
10.1016/j.pbi.2018.04.016
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发表时间:
2018-10
影响因子:
9.5
通讯作者:
Sablowski R
Sablowski R
中科院分区:
生物学2区
文献类型:
--
作者:
Serrano-Mislata A;Sablowski R

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新的图像分析揭示了茎分生组织肋区的三维生长模式。器官边界基因是早期茎生长的重要控制点。茎伸长与果胶的变化及其与纤维素的相互作用有关。茎的生长需要具有不同力学特性的组织之间的协调。尽管茎在进化、植物结构和作物改良中具有核心重要性,但相对于其他植物器官,茎的发育仍然知之甚少。在这里,我们总结了目前对干细胞个体发生及其调控的认识,包括来自新的图像分析和生物物理方法的见解。茎起源于茎尖分生组织的肋区(RZ),受DELLA和BLH蛋白的转录调控。这些调节因子与RZ的细胞增殖、模式和定向生长之间存在联系。在随后的节间伸长过程中,详细分析了细胞壁特性和力学,揭示了果胶改性是一个突出的控制点。最近的工作也强调了信号来协调具有不同力学特性的茎组织的生长。
New image analysis revealed 3D growth patterns in the rib zone of the shoot meristem. Organ boundary genes emerged as an important control point in early stem growth. Stem elongation correlates with changes in pectin and its interaction with cellulose. Stem growth requires coordination across tissues with different mechanical properties. In spite of its central importance in evolution, plant architecture and crop improvement, stem development remains poorly understood relative to other plant organs. Here, we summarise current knowledge of stem ontogenesis and its regulation, including insights from new image analysis and biophysical approaches. The stem initiates in the rib zone (RZ) of the shoot apical meristem, under transcriptional control by DELLA and BLH proteins. Links have emerged between these regulators and cell proliferation, patterning and oriented growth in the RZ. During subsequent internode elongation, cell wall properties and mechanics have been analysed in detail, revealing pectin modification as a prominent control point. Recent work has also highlighted signalling to coordinate growth of stem tissues with different mechanical properties.
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