Enhancing zinc bioavailability in rice using the novel synthetic siderophore ligand proline-2′-deoxymugineic acid (PDMA): critical insights from metal binding studies and geochemical speciation modeling
Author(s)
Type
Journal Article
Abstract
Bioavailable ligands that bind metals mediate their uptake in plants, leading to the study of artificial ligands as potential fertilizers. Proline-2′-deoxymugineic acid (PDMA) has shown a high affinity for FeIII, enhancing iron uptake in rice and suggesting that it could be used for improving zinc uptake. This work studied chemical solution parameters, i.e., redox potential, ion strength, pH, and ligand/metal concentrations controlling ZnII–PDMA complex formation in rice-producing soils using geochemical speciation modeling. We show that PDMA is generally selective for ZnII in reducing, saline, and alkaline soil solutions. Comparison with a recent micronutrient uptake study in rice suggests that free PDMA should be added in reducing conditions to avoid competition with CuII and FeIII or as the ZnII–PDMA complex at pH below 9. The Zn/M ratios (M = CuII, FeIII) needed to form stable ZnII–PDMA complexes were also identified. This study shows the promise of PDMA as a fertilizer to overcome zinc deficiencies in alkaline and flooded soils.
Date Issued
2025-04-09
Date Acceptance
2025-03-20
Citation
Journal of Agricultural and Food Chemistry, 2025, 73 (14), pp.8243-8253
ISSN
0021-8561
Publisher
American Chemical Society (ACS)
Start Page
8243
End Page
8253
Journal / Book Title
Journal of Agricultural and Food Chemistry
Volume
73
Issue
14
Copyright Statement
© 2025 The Authors. Published by American Chemical Society. This publication is licensed under CC-BY 4.0 .
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/40143676
Subjects
PDMA
fertilization
iron
micronutrient deficiency
mugineic acid
stability constant
Publication Status
Published
Coverage Spatial
United States
Date Publish Online
2025-03-27