Overexpression of the Auxin Receptor AFB3 in Arabidopsis Results in Salt Stress Resistance and the Modulation of NAC4 and SZF1.
Overexpression of the Auxin Receptor AFB3 in Arabidopsis Results in Salt Stress Resistance and the Modulation of NAC4 and SZF1.
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DOI：
10.3390/ijms21249528
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发表时间：
2020-12-15
影响因子：
5.6
通讯作者：
O'Brien JA
中科院分区：
文献类型：
--
作者：
Garrido-Vargas F;Godoy T;Tejos R;O'Brien JA
土壤盐分是全球农作物生产的一个关键问题。土壤中的高盐浓度会对植物的生长和发育产生负面影响。在根中，盐度影响主根和侧根的生长和发育。植物激素生长素调节植物生命周期中的各种发育过程，包括根结构的几个方面。生长素信号传导涉及特殊受体的感知，这些受体调节多种调节途径。尽管它们是冗余的，但之前的研究表明，它们的功能也可以根据组织、发育或环境线索而具有特定的背景。在这里，我们发现生长素信号传导 F-Box 3 受体的过度表达会导致根结构和萌发方面对盐度的抵抗力增强。我们还研究了可能的下游信号成分，以进一步表征生长素响应盐胁迫的作用。我们通过 NAC4 的调节将转录因子 SZF1 确定为生长素依赖性盐胁迫反应的关键成分。这些结果揭示了生长素依赖性机制，该机制导致根系结构响应盐而调节，从而识别出对应激反应很重要的激素级联。
Soil salinity is a key problem for crop production worldwide. High salt concentration in soil negatively modulates plant growth and development. In roots, salinity affects the growth and development of both primary and lateral roots. The phytohormone auxin regulates various developmental processes during the plant’s life cycle, including several aspects of root architecture. Auxin signaling involves the perception by specialized receptors which module several regulatory pathways. Despite their redundancy, previous studies have shown that their functions can also be context-specific depending on tissue, developmental or environmental cues. Here we show that the over-expression of Auxin Signaling F-Box 3 receptor results in an increased resistance to salinity in terms of root architecture and germination. We also studied possible downstream signaling components to further characterize the role of auxin in response to salt stress. We identify the transcription factor SZF1 as a key component in auxin-dependent salt stress response through the regulation of NAC4. These results give lights of an auxin-dependent mechanism that leads to the modulation of root system architecture in response to salt identifying a hormonal cascade important for stress response.
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