Outward askew endodermal cell divisions reveal INFLORESCENCE AND ROOT APICES RECEPTOR KINASE functions in division orientation.

IF 6.5 1区 生物学 Q1 PLANT SCIENCES Plant Physiology Pub Date : 2024-12-02 DOI:10.1093/plphys/kiae419
R M Imtiaz Karim Rony, Roya Campos, Patricio Pérez-Henríquez, Jaimie M Van Norman
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Abstract

Oriented cell divisions establish plant tissue and organ patterning and produce different cell types; this is particularly true of the highly organized Arabidopsis (Arabidopsis thaliana) root meristem. Mutant alleles of INFLORESCENCE AND ROOT APICES RECEPTOR KINASE (IRK) exhibit excess cell divisions in the root endodermis. IRK is a transmembrane receptor kinase that localizes to the outer polar domain of these cells, suggesting that directional signal perception is necessary to repress endodermal cell division. Here, a detailed examination revealed many of the excess endodermal divisions in irk have division planes that specifically skew toward the outer lateral side. Therefore, we termed them "outward askew" divisions. Expression of an IRK truncation lacking the kinase domain retains polar localization and prevents outward askew divisions in irk; however, the roots exhibit excess periclinal endodermal divisions. Using cell identity markers, we show that the daughters of outward askew divisions transition from endodermal to cortical identity similar to those of periclinal divisions. These results extend the requirement for IRK beyond repression of cell division activity to include cell division plane positioning. Based on its polarity, we propose that IRK at the outer lateral endodermal cell face participates in division plane positioning to ensure normal root ground tissue patterning.

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向外歪斜的内胚层细胞分裂揭示了花期和根尖受体蛋白酶在分裂定向中的功能。
定向细胞分裂建立了植物组织和器官的形态,并产生了不同的细胞类型;这在高度组织化的拟南芥(Arabidopsis thaliana)根分生组织中尤为明显。花序和根顶端受体激动蛋白酶(IRK)的突变等位基因在根内皮中表现出过量的细胞分裂。IRK 是一种跨膜受体激酶,定位于这些细胞的外极域,这表明定向信号感知是抑制内胚层细胞分裂的必要条件。在这里,详细的研究发现,irk 中许多多余的内胚层分裂的分裂平面特别偏向外侧。因此,我们称它们为 "向外歪斜 "分裂。表达缺乏激酶结构域的IRK截体可保留极性定位,并防止虹鳟向外歪斜分裂;但根部仍表现出过多的周缘内胚层分裂。利用细胞身份标记,我们发现向外歪斜分裂的子代从内胚层身份过渡到皮层身份,这与周缘分裂的子代相似。这些结果将对IRK的要求从抑制细胞分裂活动扩展到细胞分裂平面定位。根据IRK的极性,我们认为外侧内胚层细胞面的IRK参与了分裂面定位,以确保正常的根地组织形态。
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来源期刊
Plant Physiology
Plant Physiology 生物-植物科学
CiteScore
12.20
自引率
5.40%
发文量
535
审稿时长
2.3 months
期刊介绍: Plant Physiology® is a distinguished and highly respected journal with a rich history dating back to its establishment in 1926. It stands as a leading international publication in the field of plant biology, covering a comprehensive range of topics from the molecular and structural aspects of plant life to systems biology and ecophysiology. Recognized as the most highly cited journal in plant sciences, Plant Physiology® is a testament to its commitment to excellence and the dissemination of groundbreaking research. As the official publication of the American Society of Plant Biologists, Plant Physiology® upholds rigorous peer-review standards, ensuring that the scientific community receives the highest quality research. The journal releases 12 issues annually, providing a steady stream of new findings and insights to its readership.
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