Abstract：
Coexisting salt and alkaline stresses seriously threaten plant survival. Most studies have focused on halophytes; however, knowledge on how plants defend against saline-alkali stress is limited. This study investigated the role of Taraxacum mongolicum in a Puccinellia tenuiflora community under environmental saline-alkali stress to analyse the response of elements and metabolites in T. mongolicum, using P. tenuiflora as a control. The results show that the macroelements Ca and Mg are significantly accumulated in the aboveground parts (particularly in the stem) of T. mongolicum. Microelements B and Mo are also accumulated in T. mongolicum. Microelement B can adjust the transformation of sugars, and Mo contributes to the improvement in nitrogen metabolism. Furthermore, the metabolomic results demonstrate that T. mongolicum leads to decreased sugar accumulation and increased amounts of amino acids and organic acids to help plants resist saline-alkali stress. The resource allocation of carbon (sugar) and nitrogen (amino acids) results in the accumulation of only a few phenolic metabolites (i.e., petunidin, chlorogenic acid, and quercetin-3-O-rhamnoside) in T. mongolicum. These phenolic metabolites help to scavenge excess reactive oxygen species. Our study primarily helps in understanding the contribution of T. mongolicum in P. tenuiflora communities on coping with saline-alkali stress.
摘要：
盐和碱胁迫并存严重威胁着植物的生存。大多数研究都集中在盐生植物上；然而，关于植物如何抵御盐碱胁迫的知识是有限的。本研究调查了蒲公英在环境盐碱胁迫下的作用，以分析蒙古蒲公英中元素和代谢产物的响应。使用P.tenuiflora作为对照。结果表明，大量元素Ca和Mg显著积累在蒙古赤霉病的地上部分（特别是茎中）。微量元素B和Mo也在蒙古毛虫中积累。微量元素B可以调节糖的转化，Mo有助于氮代谢的改善。此外，代谢组学结果表明，蒙古毛虫导致糖积累减少，氨基酸和有机酸的含量增加，以帮助植物抵抗盐碱胁迫。碳（糖）和氮（氨基酸）的资源分配导致只有少数酚类代谢物的积累（即矮牵牛丁,绿原酸,和槲皮素-3-O-鼠李糖苷）。这些酚类代谢物有助于清除过量的活性氧。我们的研究主要有助于了解T.mongolicum在P.tenuiflora群落中应对盐碱胁迫的贡献。
