Flavins secreted by roots of iron-deficient Beta vulgaris enable mining of ferric oxide via reductive mechanisms

The New Phytologist
Patricia Sisó-TerrazaAna Álvarez-Fernández

Abstract

Iron (Fe) is abundant in soils but generally poorly soluble. Plants, with the exception of Graminaceae, take up Fe using an Fe(III)-chelate reductase coupled to an Fe(II) transporter. Whether or not nongraminaceous species can convert scarcely soluble Fe(III) forms into soluble Fe forms has deserved little attention so far. We have used Beta vulgaris, one among the many species whose roots secrete flavins upon Fe deficiency, to study whether or not flavins are involved in Fe acquisition. Flavins secreted by Fe-deficient plants were removed from the nutrient solution, and plants were compared with Fe-sufficient plants and Fe-deficient plants without flavin removal. Solubilization of a scarcely soluble Fe(III)-oxide was assessed in the presence or absence of flavins, NADH (nicotinamide adenine dinucleotide, reduced form) or plant roots, and an Fe(II) trapping agent. The removal of flavins from the nutrient solution aggravated the Fe deficiency-induced leaf chlorosis. Flavins were able to dissolve an Fe(III)-oxide in the presence of NADH. The addition of extracellular flavins enabled roots of Fe-deficient plants to reductively dissolve an Fe(III)-oxide. We concluded that root-secretion of flavins improves Fe nutrition in B. vulgar...Continue Reading

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Citations

Mar 24, 2016·Planta·Krisztina KovácsFerenc Fodor
Aug 16, 2016·Frontiers in Plant Science·Manuel González-GuerreroManuel Tejada-Jiménez
Apr 8, 2017·Trends in Plant Science·Huei Hsuan Tsai, Wolfgang Schmidt
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Jun 21, 2019·The New Phytologist·Louis Grillet, Wolfgang Schmidt
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Aug 20, 2020·Environmental Science & Technology·Peng ZhangSonghu Yuan
Jun 3, 2021·International Journal of Molecular Sciences·María José GarcíaFrancisco Javier Romera

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