The genomes of Bruguiera gymnorhiza and B. cylindrica were each assembled into 18 chromosome-level scaffolds.
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The subgenomes of B. hainesii, hybrid of B. gymnorhiza and B. cylindrica, each assembled into 18 chromosome-level scaffolds.
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The hybridisation event that gave rise to B. hainesii was estimated at somewhere between 2.44 and 3.47 million years ago.
Abstract
Mangroves are plants that live in tropical and subtropical coastal regions of the world, they are adapted to high salt environments and cyclic tidal flooding. Mangroves play important ecological roles, including acting as breeding grounds for many fish species and to prevent coastal erosion. The genomes of three mangrove species, Bruguiera gymnorhiza, Bruguiera cylindrica, and a hybrid of the two, Bruguiera hainesii were sequenced, assembled and annotated. The two progenitor species, B. gymnorhiza and B. cylindrica, were found to be highly similar to each other and sufficiently similar to B. parviflora to allow it to be used for reference based scaffolding to generate chromosome level scaffolds. The two subgenomes of B. hainesii were independently assembled and scaffolded. Analysis of B. hainesii confirms that it is a hybrid and the hybridisation event was estimated at 2.4 to 3.5 million years ago using a Bayesian Relaxed Molecular Clock approach.
