A single gene fine-tunes millet's flowering clock and grain output
Zhang L, Tang S, Wang Y, Fu H, Yin D
Crop Improvement
If you've ever wondered why some grain crops thrive when planted a few weeks earlier or later in your region, this gene is part of the hidden switchboard that decides exactly that, and tweaking it could help breeders design crops suited to your area's exact day length.
Plants have an internal clock that tells them when to flower, and that timing has to match the local seasons or they won't produce good yields. Researchers found a gene in foxtail millet, called SGD1, that works like a tiny recycling tag, marking another important protein for destruction at just the right moment to control flowering time and grain production. By studying over 1,400 plant varieties, they showed that small natural differences in this gene already explain some of the flowering and yield differences farmers see, offering a new lever for breeding better-adapted crops.
Key Findings
Identified 496 RING-type E3 ubiquitin ligase genes in the Setaria italica (foxtail millet) genome, expanded through whole-genome and lineage-specific duplication events
Pinpointed SGD1 as a key flowering-time regulator that controls grain yield by degrading the transcription factor SiSPL2, altering photoperiod signaling and metabolism pathways
Analyzed 1,433 Setaria accessions and found functional haplotype variants in SGD1 and SiSPL2 with additive effects on flowering time, suggesting a path for haplotype-guided breeding
chevron_right Technical Summary
Scientists discovered a gene called SGD1 in foxtail millet that acts like a quality-control tag, controlling when the plant flowers and how much grain it produces by degrading another key protein. This gives breeders a precise genetic target to fine-tune crop timing and yield for different climates.
Abstract Preview
Original paper
Integrated multi-omics and functional dissection of RING-type E3 ubiquitin ligases in flowering-time control in Setaria.
Flowering time is a key adaptive and agronomic trait determining regional suitability and yield stability in plants. Although ubiquitin-mediated protein degradation regulates diverse developmental ...
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Foxtail millet, scientific name Setaria italica, is an annual grass grown for human food. It is the second-most widely planted species of millet and the most grown millet species in Asia. The oldest evidence of foxtail millet cultivation was found along the ancient course of the Yellow River in C...