Fern genomes elucidate land plant evolution and cyanobacterial symbioses.

Journal Article (Journal Article)

Ferns are the closest sister group to all seed plants, yet little is known about their genomes other than that they are generally colossal. Here, we report on the genomes of Azolla filiculoides and Salvinia cucullata (Salviniales) and present evidence for episodic whole-genome duplication in ferns-one at the base of 'core leptosporangiates' and one specific to Azolla. One fern-specific gene that we identified, recently shown to confer high insect resistance, seems to have been derived from bacteria through horizontal gene transfer. Azolla coexists in a unique symbiosis with N2 -fixing cyanobacteria, and we demonstrate a clear pattern of cospeciation between the two partners. Furthermore, the Azolla genome lacks genes that are common to arbuscular mycorrhizal and root nodule symbioses, and we identify several putative transporter genes specific to Azolla-cyanobacterial symbiosis. These genomic resources will help in exploring the biotechnological potential of Azolla and address fundamental questions in the evolution of plant life.

Full Text

Duke Authors

Cited Authors

  • Li, F-W; Brouwer, P; Carretero-Paulet, L; Cheng, S; de Vries, J; Delaux, P-M; Eily, A; Koppers, N; Kuo, L-Y; Li, Z; Simenc, M; Small, I; Wafula, E; Angarita, S; Barker, MS; Bräutigam, A; dePamphilis, C; Gould, S; Hosmani, PS; Huang, Y-M; Huettel, B; Kato, Y; Liu, X; Maere, S; McDowell, R; Mueller, LA; Nierop, KGJ; Rensing, SA; Robison, T; Rothfels, CJ; Sigel, EM; Song, Y; Timilsena, PR; Van de Peer, Y; Wang, H; Wilhelmsson, PKI; Wolf, PG; Xu, X; Der, JP; Schluepmann, H; Wong, GK-S; Pryer, KM

Published Date

  • July 2, 2018

Published In

Volume / Issue

  • 4 / 7

Start / End Page

  • 460 - 472

PubMed ID

  • 29967517

Pubmed Central ID

  • PMC6786969

Electronic International Standard Serial Number (EISSN)

  • 2055-0278

International Standard Serial Number (ISSN)

  • 2055-0278

Digital Object Identifier (DOI)

  • 10.1038/s41477-018-0188-8


  • eng