Anthoceros genomes illuminate the origin of land plants and the unique biology of hornworts
Résumé
Hornworts are a bryophyte lineage that diverged from other extant land plants >400 million years ago and bear unique biological features, including a distinct sporophyte architecture, cyanobacterial symbiosis, and carbon-concentrating mechanism (CCM). Here we provide three high-quality genomes of Anthoceros hornworts. The Anthoceros genomes lack repeat-dense centromeres as well as whole genome duplication, and contain a limited transcription factor repertoire. Several genes involved in angiosperm meristem and stomata function are conserved in Anthoceros and up-regulated during sporophyte development, suggesting possible homologies at the genetic level. We identified candidate genes involved in cyanobacterial symbiosis, and found that LCIB , a Chlamydomonas CCM gene, is present in hornworts but absent in other plant lineages, implying a possible conserved role in CCM function. We anticipate these hornwort genomes will serve as essential references for future hornwort research and comparative studies across land plants.
Domaines
Sciences du Vivant [q-bio]Origine | Fichiers produits par l'(les) auteur(s) |
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