The Genome of Broomcorn Millet

Nat Commun. 2019 Jan 25;10(1):436. doi: 10.1038/s41467-019-08409-5.

Abstract

Broomcorn millet (Panicum miliaceum L.) is the most water-efficient cereal and one of the earliest domesticated plants. Here we report its high-quality, chromosome-scale genome assembly using a combination of short-read sequencing, single-molecule real-time sequencing, Hi-C, and a high-density genetic map. Phylogenetic analyses reveal two sets of homologous chromosomes that may have merged ~5.6 million years ago, both of which exhibit strong synteny with other grass species. Broomcorn millet contains 55,930 protein-coding genes and 339 microRNA genes. We find Paniceae-specific expansion in several subfamilies of the BTB (broad complex/tramtrack/bric-a-brac) subunit of ubiquitin E3 ligases, suggesting enhanced regulation of protein dynamics may have contributed to the evolution of broomcorn millet. In addition, we identify the coexistence of all three C4 subtypes of carbon fixation candidate genes. The genome sequence is a valuable resource for breeders and will provide the foundation for studying the exceptional stress tolerance as well as C4 biology.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adaptation, Physiological / genetics
  • Base Sequence
  • Biological Evolution
  • Carbon Cycle
  • Chromosome Mapping
  • Chromosomes, Plant / chemistry*
  • Gene Ontology
  • Genome, Plant*
  • High-Throughput Nucleotide Sequencing
  • MicroRNAs / classification
  • MicroRNAs / genetics
  • Molecular Sequence Annotation
  • Panicum / classification
  • Panicum / genetics*
  • Phylogeny*
  • Plant Breeding
  • Plant Proteins / genetics*
  • RNA, Plant / genetics
  • Stress, Physiological
  • Synteny
  • Ubiquitin-Protein Ligases / genetics

Substances

  • MicroRNAs
  • Plant Proteins
  • RNA, Plant
  • Ubiquitin-Protein Ligases