Diurnal Variations in Absorption and Translocation of a Ferrated Phytosiderophore in Barley as Affected by Iron Deficiency(Plant Nutrition)

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The release of phytosiderophore (PS) from roots of Fe-deficient graminaceous plants follows a distinct diurnal rhythm with maximum release rates occurring usually 3 to 4 hours after the onset of light. However, it remains to be determined whether absorption of the PS-Fe^<3+> complex shows a diurnal rhythmicity similar to that of PS release. Barley plants grown with or without 10 μм FeEDTA for 7 days were fed with ferrated PS (10 μм labelled with ^<59>Fe) at 4-h intervals to study the diurnal variations in the absorption and translocation of ^<59>Fe. The absorption of ^<59>Fe, irrespective of the Fe nutritional status of the plants, was higher during the day and lower during the night but did not show any peak throughout the day-night cycle. On the other hand, the translocation of ^<59>Fe into shoots of Fe-deficient plants was lower than that of Fe-sufficient plants, while the Fe nutritional status of the plants did not affect the absorption of ^<59>Fe by roots. The formation of root apoplastic ^<59>Fe was lower during the day and higher during the night, regardless of the Fe nutritional status of plants. Our results showed that the absorption of the PS-Fe^<3+> complex by roots did not follow the PS release pattern.
社団法人日本土壌肥料学会の論文