The ability of wheat roots to maintain K + is related to salt resistance

Wheat is a traditional salt-removing plant that can maintain low Na + in mesophyll cells. Wheat salt-tolerance breeding efforts focus on how Na + is absorbed and transported to the stem, and how wheat increases Na + excretion. However, current research has found that there is no obvious correlation between the Na + content of leaves and the salt resistance of wheat. Therefore, the row Na + of the plant itself cannot be fully explained because row Na + increases the plant's salt resistance and other physiological characteristics.

If maintaining a stable K + at the root may be an important feature of salt resistance, then the strategy of wheat salt resistance can be speculated based on the barley research results. Scientists in Australia used non-damage micro-testing techniques to measure the K + flow rate induced by NaCl in wheat of different genotypes, and compared the salt resistance between them. The results showed that the response of K + velocity on the surface of wheat roots to salt treatment was highly correlated with plant physiological characteristics and yield, and the size of K + outflow was negatively correlated with salt resistance. The key role of K + balance in plant salt tolerance shows that the use of NaCl-induced K + flow rate measurement as a “Marker” of salt resistance physiology is beneficial to the process of wheat breeding.

This work provides an important opportunity for salt resistance research, variety selection and breeding of wheat, that is, using the flow rate of K + as a "marker" to evaluate the salt resistance of wheat and accelerate the breeding process.
Keywords: non-damaging micro-measurement technique; K +; salt; wheat; root
References: Cuin TA, et al. Journal of Experimental Botany, 2008, 59: 2697-2706.

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