Salt is an important factor affecting crop yield. People solve the problem of high salt poisoning by improving the salt resistance of crops, but this creates an economic burden. Chenopodiaceae plants are inherently resistant to salt. This extraordinary salt tolerance will help us understand the plant's response to salt, but its physiological mechanism is unclear.
In 2011, Australian scientists used non-invasive micro-measurement technology to study the relationship between quinoa ions and permeation in the Chenopodiaceae, treated with 6 salt levels (0-500 mM NaCl) for 70 days and found that 100 mM and 200 mM NaCl were suitable for growth. It shows that the Chenopodiaceae plant has a very effective system to regulate the penetration to prevent the sudden emergence of NaCl stress. In young plants, high K + and low Na + levels are found, and K + in the stem increases slowly in the old leaves, which is evidence of the important role of K + in leaf osmotic adjustment in the salt environment. After the salt level increased 5 times (from 100 mM to 500 mM), the Na + content only increased by 50%, indicating that the xylem has a very strong Na + control ability or the ability to effectively remove Na + from the leaves.
There is a strong positive correlation between K + outflow and H + outflow induced by NaCl in the roots of Chenopodiaceae, indicating that the rapid NaCl-induced H + -ATPase activation needs to be restored, otherwise the depolarized membrane potential increases and the cytoplasm further Leakage K +. This work emphasizes the osmotic adjustment of inorganic ions in halophytes, that is, the process of controlling the loading and transport of xylem Na + and K + to the stem.
Keywords: saline soil plants, ion loading, membrane transport, osmotic adjustment, K +, salt stress
References: Hariadi Y et al. Journal of Experimental Botany, 2011, 62: 185-193.
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