Rhizophagus intraradices enhances soybean tolerance to soda saline-alkaline stress through coordinated regulation of ionic homeostasis and photosynthetic efficiency during critical growth stages
Copyright © 2025 Elsevier Masson SAS. All rights reserved.
| Veröffentlicht in: | Plant physiology and biochemistry : PPB. - 1991. - 229(2025), Pt A vom: 14. Aug., Seite 110382 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2025
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| Zugriff auf das übergeordnete Werk: | Plant physiology and biochemistry : PPB |
| Schlagworte: | Journal Article Ionic homeostasis Mineral nutrient elements Mycorrhizal symbiont Photosynthetic physiology |
| Zusammenfassung: | Copyright © 2025 Elsevier Masson SAS. All rights reserved. Soil salinization and alkalization are major constraints on soybean productivity. Arbuscular mycorrhizal fungi (AMF), such as Rhizophagus intraradices (Ri), enhance crop stress tolerance, but their stage-specific regulatory mechanisms in soybeans under soda saline-alkaline stress remain unclear. Using in situ soda saline-alkaline soil in pot experiments, we evaluated Ri's effects on soybean growth, ion homeostasis, and photosynthesis across critical stages: branching (V5), pod development (R4), and full maturity (R8). Ri significantly improved root and leaf biomass at V5 and R4 stages (P < 0.05), with colonization rates peaking at 86.72 % during R4. At R4 stage, compared to the control (CK) treatment, the Ri treatment significantly increased the activity of Na+K+-ATPase. It raised the contents of K+, Ca2+, and Mg2+ by 23.74 %, 44.39 %, and 11.67 %, respectively, while reducing the Na+ content (P < 0.05). Furthermore, Ri significantly enhanced the chlorophyll content of soybean leaves under saline-alkaline stress, as well as the transpiration rate (Tr), net photosynthetic rate (Pn), and stomatal conductance (GH2O) (P < 0.05). The fitting results of the light response and CO2 response curves showed that at stage V5, the Ri treatment achieved the highest maximum photosynthetic rate (Pnmax), leaf maximum carboxylation rate (Vcmax), and maximum electron transport rate (Jmax), which were 32.54 μmol/m2/s, 59.13 μmol CO2/m2/s, and 193.44 μmol/m2/s, respectively. Under saline-alkaline stress, Ri promoted biomass accumulation of soybean at stages V5 and R4, enhancing plant tolerance to soda saline-alkaline stress by regulating ionic homeostasis and improving photosynthetic efficiency, ultimately increasing yield at the R8 stage |
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| Beschreibung: | Date Revised 17.08.2025 published: Print-Electronic Citation Status Publisher |
| ISSN: | 1873-2690 |
| DOI: | 10.1016/j.plaphy.2025.110382 |