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Abstract Detail


Muñoz-Rodriguez, Pablo [1], Scotland, Robert [1].

Reconciling conflicting genomic phylogenies in the origin of sweet potato.

Loss of genetic variability is a major threat to plant diversity and a major challenge for global food security. Understanding the phylogenetic relationship between crops and their close wild relatives (CWRs) is essential for augmenting genetic diversity in crops, because these wild species constitute potential sources of genetic variability for crop improvement. In this context, sweet potato is one of the most important crops in the world, and a staple in over twenty developing countries. It produces more biomass and nutrients per hectare than any other crop, and has recently proved useful in addressing vitamin A deficiency and related disorders, which are estimated to affect over 190 million children worldwide. Despite its importance, most aspects of the relationship between sweet potato and its wild relatives remain unclear, in part due to a lack of reliable data for the wild species. Our contribution will describe the results of a comprehensive study on the origin and evolution of the sweet potato (Ipomoea batatas (L.) Lam.). We used high-throughput genomic analysis to obtain the whole chloroplast genomes and 605 nuclear DNA coding regions from 200 species in Ipomoea. We produced strongly supported nuclear and chloroplast phylogenies of Ipomoea including all the species that are closely related to the sweet potato. Our results demonstrate that sweet potato had an autopolyploid origin and that Ipomoea trifida Kunth is its closest relative and most probably its progenitor. Phylogenetic analysis of nuclear and chloroplast genomes shows conflicting topologies regarding the monophyly of sweet potato. We will explain how the process of chloroplast capture explains these conflicting patterns and will show that Ipomoea trifida had a dual role in the origin of the crop.

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1 - University of Oxford, Plant Sciences, South Parks Road, Oxford, OX, OX1 3RB, UK

Crop wild relatives
sweet potato
chloroplast capture
target enrichment

Presentation Type: Oral Paper
Session: 45, Systematics IV--Caryophs to Euasterids 2
Location: 111/Mayo Civic Center
Date: Wednesday, July 25th, 2018
Time: 4:15 PM
Number: 45010
Abstract ID:254
Candidate for Awards:None

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