Plasma membrane transporter of barley root controls Na+/K+ balance after salt stress

Plasma membrane transporter controls ion balance
The plasma membrane transporter of barley root controls the Na ⁺ /K ⁺ balance after salt stress
Salt tolerance of plants is a multi-gene trait caused by genetic, developmental, physiological, and plant-environment interactions. The intracellular Na ⁺ /K ⁺ balance is a key factor in plant salt tolerance. In a salt environment, plants prevent excessive accumulation of intracellular Na ⁺ , maintain intracellular K ⁺ concentration, and maintain a suitable intracellular Na ⁺ / The K ⁺ ratio is against salt stress, however, we know very little about how this process is achieved. In 2007, Australian scientists studied the K+ and Na+ flows of barley under salt stress using techniques such as â€œnon-invasive micro-measurementâ€ and unveiled the process of Na ⁺ /K ⁺ equilibrium. The salt-tolerant genotype barley achieves salt-tolerance as a result of a combination of mechanisms including: (1) maintaining a higher negative potential by controlling the membrane voltage; and (2) increasing the activity of the H ⁺ pump; 3) increase the Na ⁺ capacity of the cells; (4) increase the sensitivity to Ca ²⁺ . At the same time, there was no significant difference in the density and voltage dependence of the unidirectional ²² Na ⁺ influx of the control variety or the outflow K ⁺ channel after depolarization activation. The results are consistent with the fact that K ⁺ /Na ⁺ is the determinant of plant salt tolerance, indicating that plant salt tolerance is controlled by multiple pathways. The results of this study provide an effective method for species screening. The application of non-invasive micro-measurement technology to the study of ion transport mechanism, the detection of ion dynamic balance and other information, has been widely accepted and practically applied by researchers, and has made breakthrough progress.	Above : Barley of different genotypes showed significant differences after treatment with 320 mM NaCl, and the tolerance of bark tolerance (T) was much better than that of salt-sensitive (S). After NaCl treatment, the K ⁺ outflow of T varieties was significantly lower than that of S varieties. The application of exogenous Ca ²⁺ can effectively reduce the K ⁺ outflow. Integrity is inflow and negative is outflow.

Key words : salt-stress; barley; non-damage ion selective microelectrode technique (MIFE); K ⁺ flux; Na ⁺ flux.

References : Zhonghua Chen, et al, Plant Physiology, 2007, 145, 1714-1725

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ABSTRACT:

Plant salinity tolerance is a polygenic trait with contributions From genetic, developmental, and physiological interactions, In addition to interactions between the plant and its environment. In this study, we show that in salt-tolerant genotypes of barley ( Hordeum vulgare ), multiple mechanisms are well combined to Withstand saline conditions. These mechanisms include: (1) better Control of membrane voltage so retaining a more negative membrane (2) intrinsically higher H ⁺ pump activity; (3) better Ability of root cells to pump Na ⁺ from the cytosol to the external Medium; and (4) higher sensitivity to supplemental Ca ²⁺ . At The same time, no significant difference was found between contrasting Cultivars in their unidirectional ²² Na ⁺ influx or in the density And voltage dependence of depolarization-activated outward-rectifying K ⁺ channels. Overall, our results are consistent with the idea Of the cytosolic K ⁺ -to-Na ⁺ ratio being a key determinant of Plant salinity tolerance, and suggest multiple pathways of controlling That important feature in salt-tolerant plants.

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