The instantaneous salt shock poses a serious challenge to the survival of plant roots. This treatment severely affects the ion current and the membrane potential (MP) of the cortical cells. Previous studies in corn, barley and Arabidopsis have found that NaCl induces K + outflow and plasma membrane depolarization. Under normal circumstances, NaCl leads to a rapid decrease in cytoplasmic K +, and the ability to effectively maintain K + is an important feature of plant salt resistance. Salt-tolerant varieties can be screened by K + flow rate.
In order to further elucidate the early events of NaCl-induced root ion and water transport and the spatiotemporal results of ion changes, the ion currents of corn root cortex and mid-column cells were studied using non-damaging micro-measurement techniques. After treatment with 100mMNaCl for 1min, the xylem swell pressure decreased exponentially, the potential across the roots was rapidly depolarized and the xylem K + activity (AK +) decreased temporarily. At this time, a large amount of Na + was not released into the xylem duct. It was unexpectedly found that AK + decreased and Na + entered the center column, causing rapid depolarization, resulting in K + outflow from the center column organization. This depolarization has a significant difference between the cortex of the root and the cells of the central column. The root cortex cells are depolarized first, resulting in K + outflow. At this time, K + enters the cortex from the central column symplast. When Na + is loaded into the xylem, the central column cells depolarize and AK + gradually recovers.
Through this study, it was found that the plant roots responded to NaCl in time and space, from the cortex to the central column, and then affected the entire root reaction process to salt, thus making a defensive response to salt resistance. The use of non-invasive micro-measurement technology in combination with other technologies, especially fluorescence imaging technology, clearly clarifies the whereabouts of Na + and the plant's response to NaCl salt shock.
Keywords: barley, corn, membrane potential, xylem loading, non-damaging micro-measurement technique
References: Wegner LH, et al. Plant, Cell and Environment, 2011, 34: 859-869.
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