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Authors: Li, Fay-Wei and Brouwer, Paul and Carretero-Paulet, Lorenzo and Cheng, Shifeng and de Vries, Jan and Delaux, Pierre-Marc and Eily, Ariana and Koppers, Nils and Kuo, Li-Yaung and Li, Zheng and Simenc, Mathew and Small, Ian and Wafula, Eric and Angarita, Stephany and Barker, Michael S and Bräutigam, Andrea and dePamphilis, Claude and Gould, Sven and Hosmani, Prashant S and Huang, Yao-Moan and Huettel, Bruno and Kato, Yoichiro and Liu, Xin and Maere, Steven and McDowell, Rose and Mueller, Lukas A and Nierop, Klaas G J and Rensing, Stefan A and Robison, Tanner and Rothfels, Carl J and Sigel, Erin M and Song, Yue and Timilsena, Prakash R and Van de Peer, Yves and Wang, Hongli and Wilhelmsson, Per K I and Wolf, Paul G and Xu, Xun and Der, Joshua P and Schluepmann, Henriette and Wong, Gane K-S and Pryer, Kathleen M

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.

Journal: Nature plants
DOI: 10.1038/s41477-018-0188-8
Year: 2018

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