Under the high-salt environment, maintaining the ion balance in the body is vital to life activities. Salt-tolerant plants have a strong ability to maintain K + / Na + balance and can tolerate salt damage. However, how K + / Na + balance is regulated by signal transduction and what role H2O2 plays in it has been unclear, especially the signaling mechanism in vivo. In 2010, the laboratory of Chen Shaoliang of Beijing Forestry University studied the K + / Na + balance controlled by the signal transduction pathway of plasma membrane H + and transport system regulated by H2O2 and Ca2 + in Populus euphratica under NaCl stress, and proposed the signal transduction pathway of Populus euphratica under salt stress Pattern diagram. In this study, non-damaging micro-measurement technology (SIET) and laser confocal technology were used to determine the ions inside and outside the cell and into and out of the cell. It was found that NaCl caused K + outflow because the salt induced depolarization of the membrane and was found on the plasma membrane. Na + / H + countertransporter. DPI or DMTU inhibited the production of H2O2, thus causing increased K + outflow and decreased Na + / H + reverse transporter activity. NaCl induces Ca2 + influx, causing intracellular Ca2 + to rise, and the increase in Ca2 + promotes the K + / Na + balance regulated by H2O2. The results show that the plasma membrane H + binding transport system (H + -ATPase, Na + / H + reverse transporter, and Cl- / 2H + common transporter) regulates the conversion of H +, and promotes the signal transduction of H2O2 and Ca2 +, thus by regulating the K + channel And Na + / H + reverse transport system to achieve K + / Na + balance. The non-damage micro-measurement technique is an indispensable tool for obtaining information on the flow of ions across the membrane in this study. This study presents a model diagram of the salt stress signal transduction pathway of Populus euphratica cells, which provides new evidence for understanding the mechanism of how plants regulate K + / Na + balance to resist salt. Keywords: SIET, confocal microscopy, NaCl signalling Reference: SUN J., et al. Plant, Cell & Environment, 2010, 33: 943 -958
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