Research reveils new genome within the tomato family

The tomato family, Solanaceae, is a model clade for a wide range of applied and basic research questions. Currently, reference-quality genomes are available for over 30 species from seven genera, and these include numerous crops as well as wild species.

This research presents the genome of the showy-flowered Andean shrub Iochroma cyaneum M. L. Green, a woody lineage from the tomatillo subfamily Physalideae. The assembled size of the genome is more similar in size to pepper than to other sequenced diploid members of the berry clade of Solanaceae. This assembly recovers 92% of the conserved orthologous set, suggesting a nearly complete genome for this species. Most of the genomic content is repetitive (69%), with Gypsy elements alone accounting for 52% of the genome.

Despite the large amount of repetitive content, most of the 12 I. cyaneum chromosomes are highly syntenic with tomato. Bayesian concordance analysis provides strong support for the berry clade, including I. cyaneum, but reveals extensive discordance along the backbone, with the placement of chili pepper and Jaltomata being highly variable across gene trees. The I. cyaneum genome contributes to a growing wealth of genomic resources in Solanaceae and underscores the need for an expanded sampling of diverse berry genomes to dissect major morphological transitions.

Read the complete research at www.acsess.onlinelibrary.wiley.com.

Genome sequence for the blue-flowered Andean shrub Iochroma cyaneum reveals extensive discordance across the berry clade of Solanaceae. Adrian F. Powell, Jing Zhang, Duncan Hauser, Julianne A. Vilela, Alice Hu, Daniel J. Gates, Lukas A. Mueller, Fay-Wei Li, Susan R. Strickler, Stacey D. Smith. https://doi.org/10.1002/tpg2.20223 


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