College of Landscape Architecture, Sichuan Agricultural University, Wenjiang 611130, China.
Department of Plant Sciences, University of California Davis, Davis, CA 95616, USA.
Int J Mol Sci. 2022 May 16;23(10):5546. doi: 10.3390/ijms23105546.
is the only woody resurrection plant found in the world. It has a strong tolerance to drought and can survive long-term exposure to desiccated environments. However, few genes related to its drought tolerance have been functionally characterized and the molecular mechanisms underlying the stress tolerance of are largely unknown. In this study, we isolated a dehydration-inducible bHLH transcription factor gene from . Heterologous expression of enhanced the drought and salt tolerance of Arabidopsis. It can not only promote root system development under short-term stresses, but also improve growth performance under long-term treatments. Further investigation showed that contributes to enhanced leaf water retention capacity through the promotion of stomatal closure, increased osmolyte accumulation, and decreased stress-induced oxidative damage through an increase in antioxidant enzyme activities. These results suggest that may be involved in the positive regulation of stress responses in . This study provides insight into the molecular mechanism underlying the survival of in extreme dehydration conditions.
是世界上唯一发现的木本复苏植物。它具有很强的耐旱性，可以在长期暴露于干燥环境中存活。然而，与耐旱性相关的基因很少被功能表征， 对压力的耐受机制在很大程度上是未知的。在这项研究中，我们从 中分离出一个脱水诱导的 bHLH 转录因子基因 。 的异源表达增强了拟南芥的耐旱性和耐盐性。它不仅可以在短期胁迫下促进根系发育，而且可以在长期处理下改善生长性能。进一步的研究表明， 通过促进气孔关闭、增加渗透调节物质的积累以及通过增加抗氧化酶活性来减少应激诱导的氧化损伤，有助于提高叶片的保水能力。这些结果表明， 可能参与 对胁迫反应的正向调节。本研究为 在极端脱水条件下生存的分子机制提供了新的见解。
