Liu Wei, Liu Jinlin, Zhang Meijing, Zhang Jianlin, Sun Bin, He Chiquan, He Peimin, Zhang Wentao
School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China; College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China.
College of Marine Ecology and Environment, Shanghai Ocean University, Shanghai, 201306, China.
Plant Physiol Biochem. 2025 Feb;219:109404. doi: 10.1016/j.plaphy.2024.109404. Epub 2024 Dec 15.
To expedite the deployment of Sesuvium portulacastrum floating bed technology in Hangzhou Bay and the Yangtze River Estuary, and to overcome the cryogenic constraint, our study concentrated on investigating the impacts of both individual and combined stress factors, particularly low temperature and salinity, on its application. We detected the S. portulacastrum related enzyme activity and other biological macromolecules under low temperature stress, salt stress and combined stress. And we also analyzed the stress resistance mechanism under different stress conditions by transcriptomic technology. It was discovered that moderate salt stress could enhance plant tolerance to low temperature, indicating the presence of an antagonistic relationship between salinity and low temperature. The biological mechanism underlying this phenomenon lies in the fact that combined stresses induce the up-regulation of various genes and activate more pathways compared to single stress. Among these pathways, the linoleic acid metabolic pathway stands out as unique to combined stress conditions. This research represents the inaugural endeavor to investigate the impact of low temperature stress and combined stress on S.portulacastrum, offering a pivotal reference for the utilization of this plant in ecological restoration and management within the East China Sea. More valuable is that such conclusions may be extended to the coastal ecological governance of many high latitude countries, which is of great significance for global ecological environment improvement.
为加快海马齿漂浮床技术在杭州湾和长江口的推广应用，并克服低温限制，本研究着重调查了单一和复合胁迫因素，特别是低温和盐度对其应用的影响。我们检测了低温胁迫、盐胁迫及复合胁迫下海马齿相关的酶活性和其他生物大分子。并且我们还通过转录组技术分析了不同胁迫条件下的抗逆机制。研究发现，适度的盐胁迫可增强植物对低温的耐受性，表明盐度和低温之间存在拮抗关系。这一现象的生物学机制在于，与单一胁迫相比，复合胁迫会诱导多种基因上调并激活更多途径。在这些途径中，亚油酸代谢途径在复合胁迫条件下表现独特。本研究是首次探究低温胁迫和复合胁迫对海马齿影响的尝试，为该植物在东海生态修复和管理中的应用提供了关键参考。更有价值的是，这些结论可能推广至许多高纬度国家的海岸生态治理，对全球生态环境改善具有重要意义。
