The magnesium-specific uptake and translocation transporters ZmMGT10 and MGR6 are upregulated not only by magnesium deficiency but also by high potassium concentrations in maize
Copyright © 2025 The Authors. Published by Elsevier Masson SAS.. All rights reserved.
| Veröffentlicht in: | Plant physiology and biochemistry : PPB. - 1991. - 224(2025) vom: 23. Juli, Seite 109977 |
|---|---|
| 1. Verfasser: | |
| Weitere Verfasser: | , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2025
|
| Zugriff auf das übergeordnete Werk: | Plant physiology and biochemistry : PPB |
| Schlagworte: | Journal Article Abiotic stress Antagonism Physiological functions Plasma membrane transporters Potassium/magnesium ratio Magnesium I38ZP9992A Potassium RWP5GA015D mehr... |
| Zusammenfassung: | Copyright © 2025 The Authors. Published by Elsevier Masson SAS.. All rights reserved. The antagonism between potassium (K+) and magnesium (Mg2+) is the primary cause of Mg2+ deficiency worldwide. Recent studies have demonstrated that the suppressive effect of K+ on Mg2+ uptake is significantly reduced as the K+/Mg2+ ratio increases, as both cations share non-specific cation channels. Concomitantly, the relative root/shoot translocation of Mg2+ increased. In contrast, there are indications that elevated tissue [K+] impedes the primary physiological functions of Mg2+. In this study on Zea mays L., the involvement of the only known specific Mg2+ uptake transporter ZmMGT10 and that of the translocation transporter MGR6 was examined. In a hydroponic setup, young maize plants were subjected to eight distinct K+/Mg2+ ratios. Relative RNA expression of the two transporters was examined. In a second experiment, the effect of elevated leaf [K+] on the physiological functions of Mg2+ was investigated, while uptake antagonism was avoided. The maize plants here were subjected to a sufficient Mg2+ supply and absolute deficiency under conditions of adequate and excess [K+]. The analysis included chlorophyll values, starch, and nutrient concentration. While ZmMGT10;1 was higher expressed due to K+-induced lower root [Mg+2], ZmMGT10;2 showed a higher expression at high K+ exposure, although this response was independent of root [Mg+2]. A similar response was also observed for MGR6. It was found that the physiological functions of Mg2+ were not affected by increased [K+] in the tissue. In conclusion, the higher uptake and the elevated expression of translocation transporters were identified as an adaptation strategy of maize plants to K+-induced Mg2+ deficiency |
|---|---|
| Beschreibung: | Date Completed 23.05.2025 Date Revised 23.05.2025 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1873-2690 |
| DOI: | 10.1016/j.plaphy.2025.109977 |