MYB52 negatively regulates ADF9-meditated actin filament bundling in Arabidopsis pavement cell morphogenesis.

IF 9.3 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Tianqi Qiu, Yuanyuan Su, Nannan Guo, Xinyuan Zhang, Pengfei Jia, Tonglin Mao, Xianling Wang
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引用次数: 0

Abstract

It has been proposed that cortical fine actin filaments are needed for the morphogenesis of pavement cells (PCs). However, the precise role and regulation mechanisms of actin filaments in PC morphogenesis are not well understood. Here, we found that Arabidopsis thaliana ACTIN DEPOLYMERIZING FACTOR9 (ADF9) is required for the morphogenesis of PC, which is negatively regulated by the R2R3 MYELOBLASTOSIS (MYB) transcription factor MYB52. In adf9 mutants, the lobe number of cotyledon PCs was significantly reduced, while the average lobe length did not differ significantly compared to that of wild type (Col-0), except for the variations in cell area and circularity, whereas the PC shapes in ADF9 overexpression seedlings showed different results. ADF9 decorated actin filaments, and colocalized with plasma membrane. The extent of filament bundling and actin filament bundling activity in adf9 mutant decreased. In addition, MYB52 directly targeted the promoter of ADF9 and negatively regulated its expression. The myb52-2 mutant showed increased lobe number and cell area, reduced cell circularity of PCs, and the PC phenotypes were suppressed when ADF9 was knocked out. Taken together, our data demonstrate that actin filaments play an important role in the morphogenesis of PC and reveal a transcriptional mechanism underlying MYB52 regulation of ADF9-mediated actin filament bundling in PC morphogenesis.

在拟南芥铺层细胞形态发生过程中,MYB52 负向调节 ADF9 介导的肌动蛋白丝束。
有人提出,铺层细胞(PC)的形态发生需要皮层细肌动蛋白丝。然而,肌动蛋白丝在 PC 形态发生中的确切作用和调控机制还不十分清楚。在这里,我们发现拟南芥ACTIN DEPOLYMERIZING FACTOR9(ADF9)是PC形态发生所必需的,它受R2R3 MYELOBLASTOSIS(MYB)转录因子MYB52的负调控。在adf9突变体中,子叶PC的叶片数明显减少,而平均叶片长度与野生型(Col-0)相比除细胞面积和圆度变化外没有明显差异,而ADF9过表达幼苗的PC形状则表现出不同的结果。ADF9 修饰肌动蛋白丝,并与质膜共定位。adf9突变体的丝束化程度和肌动蛋白丝束化活性降低。此外,MYB52直接靶向ADF9的启动子,负调控其表达。myb52-2突变体的细胞叶数量和细胞面积增加,PC细胞的圆周率降低,而敲除ADF9后PC表型受到抑制。综上所述,我们的数据证明了肌动蛋白丝在PC形态发生中的重要作用,并揭示了MYB52调控ADF9介导的肌动蛋白丝束在PC形态发生中的转录机制。
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来源期刊
Journal of Integrative Plant Biology
Journal of Integrative Plant Biology 生物-生化与分子生物学
CiteScore
18.00
自引率
5.30%
发文量
220
审稿时长
3 months
期刊介绍: Journal of Integrative Plant Biology is a leading academic journal reporting on the latest discoveries in plant biology.Enjoy the latest news and developments in the field, understand new and improved methods and research tools, and explore basic biological questions through reproducible experimental design, using genetic, biochemical, cell and molecular biological methods, and statistical analyses.
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