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. 2018 Jan 19;9:10. doi: 10.3389/fpls.2018.00010

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Copyright © 2018 Waters, Amundsen and Graef.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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Leaf chlorophyll and root ferric-chelate reductase activity in IDC tolerant and sensitive soybean plants. Plants were pretreated with 1 or 25 μM Fe(III)-EDDHA for 6 d then treated with 1 or 25 μM Fe(III)-EDDHA and 0, 1, 2.5, or 5 mM sodium bicarbonate for 4 d. First trifoliate leaf chlorophyll (in SPAD units) in (A) IDC sensitive plants and (B) IDC tolerant plants. Root FCR activity in (C) IDC sensitive plants and (D) IDC tolerant plants. ^* indicates a significant difference (p < 0.05) between treatment and control (25 Fe, 0 Bic). + in (B) and (D) indicates a significant difference between the tolerant and sensitive lines in that treatment.