Shabrangy Azita, Luschnig Christian
Molecular Systems Biology (MOSYS), Department of Functional and Evolutionary Ecology, Faculty of Life Sciences, University of Vienna, Vienna, Austria.
Institute of Molecular Plant Biology (IMPB), BOKU University, Wien, Austria.
Physiol Plant. 2025 May-Jun;177(3):e70274. doi: 10.1111/ppl.70274.
Magnetic fields (MF) exert a considerable influence on biological processes in various organisms, including prominent effects on plant growth and development. Plant responses to MFs are highly diverse, implying that a plethora of processes are affected, hampering their molecular characterization. In this report, we employed the well-characterized plant model Arabidopsis thaliana to determine root growth responses to both static magnetic fields (SMF) and gradient magnetic fields (Gradient MF). SMF exposure resulted in a dosage-dependent inhibition of root elongation growth and altered auxin-responsive reporter expression, whilst Gradient MF exposure interfered with root curvature and auxin signaling under conditions of minimized gravity effects. Mutants deficient in components of the Arabidopsis auxin transport machinery were less responsive to MFs than wild type, indicative of MF-induced effects on polar auxin transport. When viewing the subcellular localization of PIN-FORMED (PIN) auxin efflux transporters in root meristems, we found that MFs impact their subcellular distribution in root cap and epidermis cells. These effects on PIN localization hint at a molecular switch, linking cellular protein dynamics, auxin transport, and morphogenesis, by which MFs impact the growth of higher plants.
磁场（MF）对各种生物体的生物过程有相当大的影响，包括对植物生长和发育的显著作用。植物对MF的反应高度多样，这意味着大量过程受到影响，阻碍了对其分子特征的研究。在本报告中，我们使用了特征明确的植物模型拟南芥来确定其根系对静磁场（SMF）和梯度磁场（Gradient MF）的生长反应。暴露于SMF导致根系伸长生长受到剂量依赖性抑制，并改变了生长素响应报告基因的表达，而在重力影响最小的条件下，暴露于Gradient MF会干扰根系弯曲和生长素信号传导。拟南芥生长素运输机制成分缺陷的突变体对MF的反应比野生型弱，这表明MF对极性生长素运输有诱导作用。当观察根分生组织中PIN-FORMED（PIN）生长素外排转运蛋白的亚细胞定位时，我们发现MF影响它们在根冠和表皮细胞中的亚细胞分布。这些对PIN定位的影响暗示了一种分子开关，它将细胞蛋白质动态、生长素运输和形态发生联系起来，通过这种方式MF影响高等植物的生长。
