Improving zinc accumulation in barley endosperm using HvMTP1, a transition metal transporter

Menguer, Paloma, Vincent, Thomas, Miller, Anthony J., Brown, James K.M., Vincze, Eva, Borg, Søren, Holm, Preben Bach, Sanders, Dale and Podar, Dorina (2018) Improving zinc accumulation in barley endosperm using HvMTP1, a transition metal transporter. Plant Biotechnology Journal, 16 (1). 63–71. ISSN 1467-7644

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Abstract

Zinc (Zn) is essential for all life forms, including humans. It is estimated that around two billion people are deficient in their Zn intake. Human dietary Zn intake relies heavily on plants, which in many developing countries consists mainly of cereals. The inner part of cereal grain, the endosperm, is the part that is eaten after milling but contains only a quarter of the total grain Zn. Here we present results demonstrating that endosperm Zn content can be enhanced through expression of a transporter responsible for vacuolar Zn accumulation in cereals. The barley (Hordeum vulgare) vacuolar Zn transporter HvMTP1 was expressed under the control of the endosperm-specific D-hordein promoter. Transformed plants exhibited no significant change in growth but had higher total grain Zn concentration, as measured by ICP-OES, compared to parental controls. Compared with Zn, transformants had smaller increases in concentrations of Cu and Mn but not Fe. Staining grain cross-sections with the Zn-specific stain DTZ revealed a significant enhancement of Zn accumulation in the endosperm of two of three transformed lines, a result confirmed by ICP-OES in the endosperm of dissected grain. Synchrotron X-ray fluorescence analysis of longitudinal grain sections demonstrated a redistribution of grain Zn from aleurone to endosperm. We argue that this proof-of-principle study provides the basis of a strategy for biofortification of cereal endosperm with Zn.

Item Type: Article
Uncontrolled Keywords: mtp,biofortification,mineral nutrition,membrane transporter,cereals,sxrf
Faculty \ School: Faculty of Science > School of Biological Sciences
Related URLs:
Depositing User: Pure Connector
Date Deposited: 18 May 2017 05:06
Last Modified: 17 Mar 2020 23:23
URI: https://ueaeprints.uea.ac.uk/id/eprint/63555
DOI: 10.1111/pbi.12749

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