The SOS signal transduction pathway is very important in plant ion balance and salt tolerance. The SOS model believes that high Na + causes the increase of intracellular free Ca2 +, activates the expression of SOS3 encoded by Ca2 + binding protein, and affects the downstream response. SOS3 activates the linked SOS2 (serine / threonine protein kinase), and the SOS2 / SOS3 complex regulates the expression level of SOS1 (plasma membrane Na + / H + reverse transporter) encoded by salt tolerance factors, thereby promoting excessive intracellular Na + is excreted from the body. This involves changes in K +, and the disruption of Na + and K + balance may be the key in the SOS pathway, but the details are unclear. In particular, signals and ion transport at the level of living cells and tissues lack electrophysiological data. Australian scientists used non-damaging micro-measurement technology (MIFE) to compare the differences in K +, H +, and Na + flow rates in the root elongation and mature regions of wild-type Arabidopsis wild-type col and sos mutants. The study found that: (1) SOS mutation affects the function of the entire root, not just the root tip area; (2) SOS signal transduction pathway has a high degree of branching; (3) Na + affects SOS1 may be through the root tip SOS2 / SOS3 Complex; (4) SOS mutation affects H + transport even without salt stress; (5) SOS1 mutation affects intracellular K + balance through the outward K + channel activated by plasma membrane depolarization; (6) H + pump may be SOS A target for signal transduction. This study provides the pattern of SOS signal transduction and the physiological mechanism of salt stress perception and signal transduction. It is very necessary to understand the functional genomics of plants. The non-invasive micro-measurement technology real-time live measurement method provides the most Good tool. Keywords: K +, Na +, H +, SOS signal transduction, non-damaging micro-measurement technology (MIFE) Reference: Shabala L et al. Planta, 2005, 222: 1041-1050.
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