期刊
PLANT AND SOIL
卷 -, 期 -, 页码 -出版社
SPRINGER
DOI: 10.1007/s11104-021-05152-z
关键词
Mugineic acid; Iron deficiency; Chlorosis; Chelate; Reduction; EDDHA
资金
- AICHI STEEL CORPORATION, Cabinet Office
- Advanced Next-Generation Greenhouse Horticulture by IoP (Internet of Plants), Japan [A12]
- Core Research for Evolutional Science and Technology (CREST) of the Japan
- Science and Technology Agency, Japan [JPMJCR1503]
PDMA-Fe shows higher availability for cucumber than other synthetic chelates under different soil conditions, with greater reducibility at alkaline pH. Additionally, PDMA-Fe treatment significantly increases shoot iron concentration.
Purpose Phytosiderophores (PS) from grasses solubilize sparingly soluble iron (Fe), and the resultant PS-Fe is an Fe source even for dicots. Recently, the synthetic PS proline-2 '-deoxymugineic acid (PDMA) has been developed as a moderately biodegradable Fe fertilizer for grasses. We aimed to investigate whether PDMA-Fe is also a good Fe source for dicots. Methods The availability of PDMA-Fe to cucumber was evaluated in a calcareous substrate and hydroponic cultures at pH 7.0-9.0 by determining chlorophyll level, PSII activity, and Fe uptake. EDDHA-Fe, EDTA-Fe, and citrate-Fe were used as controls. The reducibility of Fe chelates by roots was measured to determine the mechanism underlying differences in availability. Expressions of Fe deficiency-inducible genes were analyzed to estimate the Fe status in plants. Results The application of PDMA-Fe and EDDHA-Fe to a calcareous substrate reduced Fe-deficient chlorosis to a similar extent; however, the shoot Fe concentration was higher in the PDMA-Fe treatment. In the hydroponic culture, the availability of PDMA-Fe was higher than that of the other chelates at all pH levels, and this was confirmed by higher PSII activity and lower expression of Fe deficiency-inducible genes. The reducibility assay revealed that the reduction level of PDMA-Fe was greater than that of EDTA-Fe and citrate-Fe under alkaline pH. Conclusions PDMA-Fe is utilized by cucumber roots more efficiently than traditional synthetic chelates in both calcareous substrate and hydroponic cultures. The higher availability of PDMA-Fe may be attributed to its higher reducibility. Our findings suggest that PDMA-Fe could be a good Fe fertilizer for dicots.
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