Scientists find gene that makes wheat grain richer in iron
Meng Y, Tian Z, Fan J, He Z, Yu B
Crop Improvement
Iron-deficiency anemia affects billions of people worldwide, and a staple crop like wheat that naturally packs more iron into its grain could quietly improve nutrition for families who eat bread and flour every day without changing how they farm or cook.
Researchers discovered a protein in wheat, called TaPIL1, that acts like a switch turning on iron storage when the plant senses low iron in the soil. Wheat plants with more of this switch active stored more iron in their roots, shoots, and even the white flour made from their grain, while plants missing the switch stored less. Because some existing wheat varieties already carry a naturally better version of this gene, breeders could use it right away to develop more nutritious, iron-rich wheat.
Key Findings
TaPIL1 overexpression lines accumulated higher iron in roots, shoots, and white flour compared to wild-type wheat, while CRISPR knockout mutants accumulated less.
TaPIL1 directly binds and activates the promoters of two iron-storage genes, TaNRAMP3 and TaFer1, confirmed via yeast one-hybrid, EMSA, and LUC assays.
Wheat varieties carrying a naturally-occurring 'elite haplotype' of TaPIL1-5B showed higher TaNRAMP3/TaFer1 expression and higher grain iron content, making it a ready target for breeding.
chevron_right Technical Summary
Scientists found a gene switch in wheat that boosts iron levels in the grain, offering a path toward wheat flour that could help fight iron-deficiency anemia in people who rely on it as a staple food.
Abstract Preview
Original paper
Transcription factor TaPIL1-mediated iron accumulation in wheat.
Iron (Fe) is an essential micronutrient that helps prevent iron deficiency anaemia in humans. To address this problem, iron biofortification represents a promising strategy for developing iron-rich...
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