{
  "id": 4992051,
  "title": "Rate of meristem initiation driven by the MADS-WUS axis contributes to floral survival and inflorescence evolution in grasses",
  "url": "https://urgent.news/2026/09/01/rate-of-meristem-initiation-driven-by-the-mads-wus-axis-contributes",
  "topic": "science",
  "section": "Science",
  "published": "2026-09-01T00:00:00.000Z",
  "source": {
    "name": "bioRxiv",
    "slug": "biorxiv",
    "url": "https://www.biorxiv.org/content/10.64898/2026.08.31.748292v1?rss=1"
  },
  "original_language": "en",
  "account": "The rate at which floral initiation, maturation, and survival occur within floral inflorescences has been significantly altered through crop domestication, yet the underlying mechanisms remain elusive. By integrating morphometry, modeling, and molecular genetic studies, researchers have uncovered that the rate of floral production in barley's indeterminate inflorescences follows an \"initiate fast, die young\" strategy. This is primarily driven by a key MADS-box gene called SPIKELET INITIATION AND FERTILITY (SIF).\n\nSIF plays a dual role in orchestrating this strategy. It simultaneously terminates the inflorescence meristem through WUSCHEL and activates the floral meristem via APETALA1 (Vrn-H1). Consequently, the ancestral SIF \"slow\" allele fosters a timely commitment to floral maturation, while the derived \"fast\" allele allows for more frequent floral initiations. The selection of SIF alleles post-domestication enabled the diversification of reproductive strategies in barley populations, ultimately enhancing yield traits in real-world conditions.\n\nFurthermore, the study reveals that a lineage-specific SIF duplication played a crucial role in meristem fate transition and inflorescence evolution during Triticeae cold adaptation. These findings establish developmental rate as a pivotal factor in architectural innovation and reproductive success within grasses.",
  "summary": "Crop domestication has repeatedly shaped inflorescence architecture to improve floral production, but mechanisms coordinating the rate of floral initiation, maturation and survival remain unclear. Combining morphometry, modelling and molecular genetic analyses, we show that floral production in the indeterminate barley (Hordeum vulgare L.) inflorescence follows an \"initiate fast-die young\"…",
  "key_points": [],
  "editors_take": null,
  "illustration": null,
  "coverage": {
    "outlets": 1,
    "also_reported_by": []
  },
  "ai_generated": true,
  "disclaimer": "Summaries, key points and the editor’s take are written by software from other outlets’ reporting and may contain errors — always check the linked original."
}