SPA, a Stigma-style-transmitting tract Physical microenvironment Assay for investigating mechano-signaling in pollen tubes.

SPA, a Stigma-style-transmitting tract Physical microenvironment Assay for investigating mechano-signaling in pollen tubes.
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DOI:
10.1073/pnas.2314325120
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发表时间:
2023-12-05
影响因子:
11.1
通讯作者:
Zhu, Xiaoyue
Zhu, Xiaoyue
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Zhou, Xiang;Han, Wenbo;Dai, Jiawei;Liu, Sujuan;Gao, Shiyuan;Guo, Yi;Xu, Tiegang;Zhu, Xiaoyue

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准确感知和响应物理微环境对细胞功能和生存至关重要,但潜在的分子机制尚不清楚。花粉管在侵入性生长过程中自然地受到来自雌蕊的复杂机械指令,为研究机械生物学提供了一个完美的单细胞模型。最近的报道揭示了体内和平面二维体外培养之间PT行为的差异。在这里,我们建立了柱头柱传递道(TT)物理微环境试验(SPA)来概括雌蕊的压力变化。这种仿生试验使我们能够快速识别高度冗余的基因GEF8/9/11/12/13,作为在风格到tt出现期间保持PTs完整性的新调控因子。与固体培养基上的正常生长相比,SPA成功地复制了gef8/9/11/12/13 PT体内生长停滞缺陷。我们的研究结果表明,存在不同的信号通路调节体内和体外PT完整性维持,强调了忠实地模拟物理微环境对研究植物细胞生物学的必要性。
Accurate sensing and responding to physical microenvironment are crucial for cell function and survival, but the underlying molecular mechanisms remain elusive. Pollen tube (PT) provides a perfect single-cell model for studying mechanobiology since it’s naturally subjected to complex mechanical instructions from the pistil during invasive growth. Recent reports have revealed discrepant PT behaviors between in vivo and flat, two-dimensional in vitro cultures. Here, we established the Stigma-style-transmitting tract (TT) Physical microenvironment Assay (SPA) to recapitulate pressure changes in the pistil. This biomimetic assay has enabled us to swiftly identify highly redundant genes, GEF8/9/11/12/13, as new regulators for maintaining PTs integrity during style-to-TT emergence. In contrast to normal growth on solid medium, SPA successfully phenocopied gef8/9/11/12/13 PT in vivo growth-arrest deficiency. Our results suggest the existence of distinct signaling pathways regulating in vivo and in vitro PT integrity maintenance, underscoring the necessity of faithfully mimicking the physical microenvironment for studying plant cell biology.
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