September 22, 2019  |  

Genome sequences of two diploid wild relatives of cultivated sweetpotato reveal targets for genetic improvement

Authors: Wu, Shan and Lau, Kin H and Cao, Qinghe and Hamilton, John P and Sun, Honghe and Zhou, Chenxi and Eserman, Lauren and Gemenet, Dorcus C and Olukolu, Bode A and Wang, Haiyan and others

Sweetpotato [Ipomoea batatas (L.) Lam.] is a globally important staple food crop, especially for sub-Saharan Africa. Agronomic improvement of sweetpotato has lagged behind other major food crops due to a lack of genomic and genetic resources and inherent challenges in breeding a heterozygous, clonally propagated polyploid. Here, we report the genome sequences of its two diploid relatives, I. trifida and I. triloba, and show that these high-quality genome assemblies are robust references for hexaploid sweetpotato. Comparative and phylogenetic analyses reveal insights into the ancient whole-genome triplication history of Ipomoea and evolutionary relationships within the Batatas complex. Using resequencing data from 16 genotypes widely used in African breeding programs, genes and alleles associated with carotenoid biosynthesis in storage roots are identified, which may enable efficient breeding of varieties with high provitamin A content. These resources will facilitate genome-enabled breeding in this important food security crop.

Journal: Nature communications
DOI: 10.1038/s41467-018-06983-8
Year: 2018

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