Molecular switches that tell seeds to sleep or sprout finally mapped
Matilla AJ, Fuertes-Aguilar J
Seed Saving
Every seed packet you store over winter is relying on the same dormancy controls this research untangles, and understanding them could mean better germination rates and more predictable spring sowings.
Plants have a family of proteins that act like traffic controllers inside seeds, deciding when conditions are right to sprout. This review pulls together what scientists know about a particularly large group of these controllers, showing how they read hormone signals from the plant and the environment to keep seeds asleep or wake them up. Knowing how this system works opens doors to breeding crops and garden plants that germinate more reliably or stay dormant longer for storage.
Key Findings
R2R3-MYB transcription factors have expanded dramatically in land plants and regulate dormancy, germination, seed size, and seed-coat pigmentation across species.
Specific members including MYB56, MYB62, MYB96, and MYB30 integrate signals from at least four hormones (ABA, GA, jasmonates, and nitric oxide) to balance dormancy and germination.
A phylogenetic analysis revealed lineage-specific gene groupings and conserved evolutionary clades within the R2R3-MYB family, tracing its origins to roughly one billion years ago in early eukaryotes.
chevron_right Technical Summary
A new review maps how a large family of plant proteins called R2R3-MYB transcription factors controls when seeds stay dormant versus when they sprout. These proteins act as molecular switches, reading hormone signals to decide whether a seed should wait or grow.
Abstract Preview
Original paper
Regulatory roles of R2R3-MYB genes in plant growth, development and stress adaptation: insights into seed dormancy and germination.
GAMYBsand TT2 are R2R3-MYB TFs involved in seed dormancy and germination, with GAMYBs mediating GA signaling and TT2 regulating seed-coat proanthocyanidins. The MYB (v-myb avian myeloblastosis vira...
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Plant signaling encompasses the molecular and cellular mechanisms by which plants perceive and respond to environmental changes, hormonal signals, and stress conditions. These signaling pathways regulate fundamental biological processes including growth, development, nutrient acquisition, and
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