Modification of storage proteins in the barley grain increases endosperm zinc and iron under both normal and elevated atmospheric CO2

Increasing atmospheric CO2 concentration is expected to enhance the grain yield of C3 cereal plants, while at the same time reducing the concentrations of minerals and proteins. This will lead to a lower nutritional quality and increase global problems associated with micronutrient malnutrition. Amo...

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Bibliographic Details
Published in:Physiologia plantarum 2022-01, Vol.174 (1), p.e13624-n/a
Main Authors: Gao, Yajie, Persson, Daniel P., Vincze, Eva, Schjoerring, Jan K.
Format: Article
Language:English
Subjects:
Amino acids
Antisense RNA
Barley
Carbon dioxide
Carbon dioxide concentration
Crop yield
Endosperm
Grain storage
Hordein
Inductively coupled plasma mass spectrometry
Iron
Laser ablation
Malnutrition
Mass spectrometry
Mass spectroscopy
Minerals
Nutritive value
Prolamines
Protein composition
Proteins
RNA-mediated interference
Storage
Storage proteins
Sulfur
Uptake, Transport and Assimilation
Zinc
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Summary:Increasing atmospheric CO2 concentration is expected to enhance the grain yield of C3 cereal plants, while at the same time reducing the concentrations of minerals and proteins. This will lead to a lower nutritional quality and increase global problems associated with micronutrient malnutrition. Among the barley grain storage proteins, the C‐hordein fraction has the lowest abundance of sulfur (S) containing amino acids and is poorest in binding of zinc (Zn). In the present study, C‐hordein‐suppressed barley lines with reduced C‐hordein content, obtained by use of antisense or RNAi technology, were investigated under ambient and elevated atmospheric CO2 concentration. Grains of the C‐hordein‐suppressed lines showed 50% increase in the concentrations of Zn and iron (Fe) in the core endosperm relative to the wild‐type under both ambient and elevated atmospheric CO2. Element distribution images obtained using laser ablation‐inductively coupled plasma‐mass spectrometry confirmed the enrichment of Fe and Zn in the core endosperm of the lines with modified storage protein composition. We conclude that modification of grain storage proteins may improve the nutritional value of cereal grain with respect to Zn and Fe under both normal and future conditions of elevated atmospheric CO2.
ISSN:0031-9317
1399-3054
DOI:10.1111/ppl.13624