Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 70, Issue 8, Pages 2564-2573Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.1c08034
Keywords
Fe plaque; OsYSL15; soil solution; OsIRT1; isotope fractionation; flooded conditions; uptake
Funding
- National Natural Science Foundation of China [42030702, 41877043]
- Guangdong Key Research and Development Project [2019B110207002]
- Local Innovative and Research Teams Project of Guangdong Pearl River Talents Program [2017BT01Z176]
- Natural Science Foundation of Guangdong Province [2021A1515110574]
- GDAS' Project of Science and Technology Development [2021GDASYL-20210103043]
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Rice utilizes different strategies and sources to absorb iron depending on water conditions. Isotope signature combined with gene expression analysis revealed that under flooded conditions, rice predominantly absorbs Fe(III)-DMA from Fe plaque, while under drained conditions, it primarily absorbs Fe2+ from soil solution.
Rice can simultaneously absorb Fe2+ via a strategy I-like system and Fe(III)-phytosiderophore via strategy II from soil. Still, it remains unclear which strategy and source of Fe dominate under distinct water conditions. An isotope signature combined with gene expression was employed to evaluate Fe uptake and transport in a soil-rice system under flooded and drained conditions. Rice of flooded treatment revealed a similar delta Fe-56 value to that of soils (Delta Fe-56(rice-soil) = 0.05 parts per thousand), while that of drained treatment was lighter than that of the soils (Delta Fe-56(rice-soil )= -0.41 parts per thousand). Calculations indicated that 70.4% of Fe in rice was from Fe plaque under flooded conditions, while Fe was predominantly from soil solution under drained conditions. Up-regulated expression of OsNAAT1, OsTOM2, and OsYSL15 was observed in the root of flooded treatment, while higher expression of OsIRT1 was observed in the drained treatment. These isotopic and genetic results suggested that the Fe(III)-DMA uptake from Fe plaque and Fe2+ uptake from soil solution dominated under flooded and drained conditions, respectively.
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