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. 2020 Jul 29;11:3670. doi: 10.1038/s41467-020-17302-5

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© This is a U.S. government work and not under copyright protection in the U.S.; foreign copyright protection may apply 2020

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Fig. 1 — Brachypodium hybridum has formed more than once from reciprocal crosses. We can use chloroplast genome (plastome) sequence to determine the maternal progenitor species of any B. hybridum line. To facilitate writing about the origin of individual lines, we designate lines that had B. distachyon as a maternal progenitor species as D plastotype, and lines that had B. stacei as a maternal progenitor species as S plastotype. The chromosomes of B. distachyon are named Bd1 to Bd5, and the chromosomes of B. stacei are named Bs1 to Bs10. To allow us to easily link B. hybridum chromosomes to their diploid orthologs, we named B. hybridum chromosomes BhD1 to BhD5 for chromosomes derived from B. distachyon and BhS1 to BhS10 for chromosomes derived from B. stacei. The diagram shows stylized plant cells with color coding, indicating the origin of the plastome and nuclear genomes (B. distachyon-type, blue; B. stacei-type, red). For clarity, the haploid number of chromosomes is shown.