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Embryo-specific silencing of a transporter reduces phytic acid content of maize and soybean seeds
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Embryo-specific silencing of a transporter reduces phytic acid content of maize and soybean seeds
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Journal Article
Embryo-specific silencing of a transporter reduces phytic acid content of maize and soybean seeds
2007
Overview
Phytic acid in cereal grains and oilseeds is poorly digested by monogastric animals and negatively affects animal nutrition and the environment. However, breeding programs involving mutants with less phytic acid and more inorganic phosphate (P
i
) have been frustrated by undesirable agronomic characteristics associated with the phytic acid-reducing mutations. We show that maize
lpa1
mutants are defective in a multidrug resistance-associated protein (MRP) ATP-binding cassette (ABC) transporter that is expressed most highly in embryos, but also in immature endosperm, germinating seed and vegetative tissues. Silencing expression of this transporter in an embryo-specific manner produced low-phytic-acid, high-P
i
transgenic maize seeds that germinate normally and do not show any significant reduction in seed dry weight. This dominant transgenic approach obviates the need for incorporating recessive
lpa1
mutations to create maize hybrids with reduced phytic acid. Suppressing the homologous soybean MRP gene also generated low-phytic-acid seed, suggesting that the strategy might be feasible for many crops.
Publisher
Nature Publishing Group US,Nature Publishing Group
Subject
/ Acids
/ ATP
/ Biological and medical sciences
/ Biomedical and Life Sciences
/ Biomedical Engineering/Biotechnology
/ Corn
/ Embryos
/ exons
/ Fundamental and applied biological sciences. Psychology
/ Genetic Engineering - methods
/ genetics
/ Grain
/ Hybrids
/ introns
/ methods
/ Methods. Procedures. Technologies
/ Mutants
/ Mutation
/ Plants, Genetically Modified
/ Plants, Genetically Modified - metabolism
/ Seeds
/ Soybeans
/ Transgenic animals and transgenic plants
/ Zea mays
