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Zinc Localization and Speciation in Rice Grain Under Variable Soil Zinc Deficiency.

Yating Shen^1,2,3, Elizabeth Wiita^1,4, Athena A Nghiem¹

¹Lamont-Doherty Earth Observatory of Columbia University, Palisades, New York, NY 10964, USA.

Plant and Soil

|December 2, 2024

Summary

Zinc speciation in rice grain is poorly understood. This study reveals that zinc phytate, a largely unavailable form, dominates in rice, especially in zinc-deficient soils, potentially impacting human nutrition.

Keywords:

Zn EXAFS Zn deficiency bioaccessibility bioavailability micro-XRF phytate Zn

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Hydroponics: A Versatile System to Study Nutrient Allocation and Plant Responses to Nutrient Availability and Exposure to Toxic Elements

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Published on: July 13, 2016

Area of Science:

Agricultural Science
Nutritional Science
Analytical Chemistry

Background:

Rice is a staple food for over half the world's population, providing 20% of daily caloric intake.
Zinc (Zn) is an essential nutrient for both rice growth and human health.
Current understanding of Zn chemical forms (speciation) in rice grain and the impact of soil Zn deficiency is limited.

Purpose of the Study:

To analyze the composition and Zn speciation in Cambodian rice grain.
To develop a method for quantifying Zn species in rice grain.
To investigate the effects of soil Zn availability on Zn speciation in rice grain.

Main Methods:

Utilized synchrotron-based microprobe X-ray fluorescence (μ-XRF) and extended X-ray absorption fine-structure spectroscopy (EXAFS).
Developed a quantitative method for Zn species based on Zn-ligand coordination (oxygen and sulfur).
Analyzed rice grain samples from varying soil Zn conditions.

Main Results:

Rice grain Zn concentrations ranged from 15-30 mg kg^-1, independent of soil Zn availability.
72%-90% of grain Zn was found as Zn-phytate, a poorly bioavailable form.
Minor amounts of Zn were complexed with nicotianamine, or present as ZnCO₃ or thiols.

Conclusions:

Soil Zn deficiency significantly impacts Zn speciation in rice grain, increasing the proportion of Zn-phytate.
Elevated Zn-phytate levels in Zn-deficient conditions reduce the bioavailability of Zn to human consumers.
Further research is needed to understand the implications of Zn-phytate for human nutrition in Zn-deficient regions.