Shandong Provincial Key Laboratory of Plant Stress Research, College of Life Sciences, Shandong Normal University, Jinan 250014, China.
Int J Mol Sci. 2021 Feb 23;22(4):2203. doi: 10.3390/ijms22042203.
Soil salinization is a serious and growing problem around the world. Some plants, recognized as the recretohalophytes, can normally grow on saline-alkali soil without adverse effects by secreting excessive salt out of the body. The elucidation of the salt secretion process is of great significance for understanding the salt tolerance mechanism adopted by the recretohalophytes. Between the 1950s and the 1970s, three hypotheses, including the osmotic potential hypothesis, the transfer system similar to liquid flow in animals, and vesicle-mediated exocytosis, were proposed to explain the salt secretion process of plant salt glands. More recently, increasing evidence has indicated that vesicular transport plays vital roles in salt secretion of recretohalophytes. Here, we summarize recent findings, especially regarding the molecular evidence on the functional roles of vesicular trafficking in the salt secretion process of plant salt glands. A model of salt secretion in salt gland is also proposed.
土壤盐渍化是一个全球性的严重且日益严重的问题。一些植物，被称为泌盐植物，能够通过将多余的盐分从体内排出而正常生长在盐碱地上，不会产生不良影响。阐明盐分分泌过程对于理解泌盐植物所采用的耐盐机制具有重要意义。在 20 世纪 50 年代至 70 年代期间，提出了三个假说，包括渗透势假说、类似于动物液体流动的转运系统假说和液泡介导的胞吐作用假说，来解释植物盐腺的盐分分泌过程。最近，越来越多的证据表明，液泡运输在泌盐植物的盐分分泌中起着至关重要的作用。在这里，我们总结了最近的发现，特别是关于液泡运输在植物盐腺盐分分泌过程中的功能作用的分子证据。还提出了一个盐腺盐分分泌的模型。
