alexa Toxicity of Chelated Iron (Fe-DTPA) in American Cranberry | OMICS International
ISSN: 2376-0354

Journal of Horticulture
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Research Article

Toxicity of Chelated Iron (Fe-DTPA) in American Cranberry

Sarah Siebach2, Juan Zalapa1,2*, Giovanny Covarrubias-Pazaran2, Rebecca Harbut3, Beth Workmaster2,
Lisa Wasko DeVetter4, Shawn Steffan1, Christelle Guédot1 and Amaya Atucha2
1U. S. Department of Agriculture, Agricultural Research Service, Vegetable Crops Research Unit, 1575 Linden Drive, Madison, Wisconsin 53706, USA
2Department of Entomology, University of Wisconsin, 1575 Linden Drive, Madison, Wisconsin 53706, USA
3Kwantlen Polytechnic University, 12666 72 Avenue - Surrey, B.C. V3W 2M8, Canada
4Department of Horticulture, Washington State University, 16650 State Route 536, Mount Vernon, WA 98273, USA
Corresponding Author : Zalapa J
U. S. Department of Agriculture
Agricultural Research Service
Vegetable Crops Research Unit, 1575 Linden Drive
Madison, Wisconsin 53706, USA
Tel: 1 608-263-2400
E-mail: [email protected], [email protected]
Received November 23, 2015; Accepted February 23, 2015; Published February 27, 2015
Citation: Siebach S, Zalapa J, Covarrubias-Pazaran G, Harbut R, Workmaster B, et al. (2015) Toxicity of Chelated Iron (Fe-DTPA) in American Cranberry. J Horticulture 2:129. doi:10.4172/2376-0354.1000128
Copyright: © 2015 Siebach S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

American cranberry (Vaccinium macrocarpon) is naturally adapted to environments with high concentrations of soluble iron. Yet, there is a need to further explore iron nutrition in cranberry given concerns of toxicity problems from irrigation with iron-rich water. This study investigated the threat of iron toxicity by evaluating its effects on shoot growth total shoot weight, length (primary shoot and axillary growth), and number of axillary shoots in cranberry plants exposed to varying levels of a commonly used chelated iron, specifically Sequestrene 330 (ferric diethylenetriamine penta-acetate; Fe-DTPA). Cranberry plants were grown under controlled greenhouse conditions and received varying concentrations of Fe-DTPA in their irrigation water solutions. Four treatments of Fe-DTPA were applied (0, 14 ppm, 28 ppm, 56 ppm Fe), and shoot growth measurements were taken weekly over the course of 20 weeks. At the end of the course, total fresh shoot weight was recorded for each plant and tissues were sampled for nutrient analysis. Overall, shoot length (primary shoot and axillary) was significantly (P<0.05) reduced with increasing Fe-DTPA concentrations and plant symptoms included leaf drop, necrosis, and mortality in the higher concentration treatments. The number of axillary shoots per upright significantly (P<0.05) increased with treatment intensification. Nutrient analysis revealed increasing amounts of iron with increasing Fe-DTPA dosages. However, iron tissue levels were within the normal range found in healthy field plants (142.8-880.7 ppm) in all treatments. We hypothesized that the toxicity symptoms observed in cranberry plants treated with Fe-DTPA are likely not due to iron, but to a specific toxicity of cranberry to the chelators or other unknown components used in Fe-DTPA.

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