Glyphosate inhibition of ferric reductase activity in iron deficient sunflower roots.

The New Phytologist
Levent OzturkIsmail Cakmak

Abstract

Iron (Fe) deficiency is increasingly being observed in cropping systems with frequent glyphosate applications. A likely reason for this is that glyphosate interferes with root uptake of Fe by inhibiting ferric reductase in roots required for Fe acquisition by dicot and nongrass species. This study investigated the role of drift rates of glyphosate (0.32, 0.95 or 1.89 mm glyphosate corresponding to 1, 3 and 6% of the recommended herbicidal dose, respectively) on ferric reductase activity of sunflower (Helianthus annuus) roots grown under Fe deficiency conditions. Application of 1.89 mm glyphosate resulted in almost 50% inhibition of ferric reductase within 6 h and complete inhibition 24 h after the treatment. Even at lower rates of glyphosate (e.g. 0.32 mm and 0.95 mm), ferric reductase was inhibited. Soluble sugar concentration and the NAD(P)H oxidizing capacity of apical roots were not decreased by the glyphosate applications. To our knowledge, this is the first study reporting the effects of glyphosate on ferric reductase activity. The nature of the inhibitory effect of glyphosate on ferric reductase could not be identified. Impaired ferric reductase could be a major reason for the increasingly observed Fe deficiency in cropp...Continue Reading

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Citations

Jul 26, 2013·Journal of Agricultural and Food Chemistry·Bahar Yildiz KutmanIsmail Cakmak
May 29, 2010·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Mathew B Sonier, Harold G Weger
Sep 28, 2012·Journal of Agricultural and Food Chemistry·Stephen O DukeRaymond Hammerschmidt
Jun 10, 2008·Environmental Pollution·Nina Cedergreen
Apr 12, 2016·Pest Management Science·Maria Luce BartuccaDaniele Del Buono
Feb 2, 2018·Environmental Sciences Europe·Daisy A MartinezMargaret C Graham
Jan 3, 2018·Environmental Science and Pollution Research International·Martha MertensWolfram Reichenbecher
Apr 9, 2019·Physiology and Molecular Biology of Plants : an International Journal of Functional Plant Biology·Wei-Yu LiXing-Yu Liang
Mar 7, 2021·Nanomaterials·Anderson L ValleLuiz R Goulart
Feb 26, 2010·Journal of Agricultural and Food Chemistry·Krishna N ReddyRobert M Zablotowicz
Jul 4, 2021·The Science of the Total Environment·Fernanda Pacheco de Almeida Prado Bortolheiro, Marcelo de Almeida Silva

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