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Sweet potato is one of the world’s most widely consumed crops, yet its evolutionary history is poorly understood. In this paper we present a comprehensive phylogenetic study of all species closely related to sweet potato and address several questions pertaining to sweet potato that remained unanswered. Our research combined genome skimming and target DNA capture to sequence the whole chloroplasts and 605 single copy nuclear regions from 199 specimens representing sweet potato and all its crop wild relatives (CWRs). We present strongly supported nuclear and chloroplast phylogenies which demonstrate that sweet potato had an autopolyploid origin and Ipomoea trifida is its closest relative, confirming that no other extant species were involved in its origin. Phylogenetic analysis of nuclear and chloroplast genomes show conflicting topologies regarding the monophyly of sweet potato. The process of chloroplast capture explains these conflicting patterns, showing that Ipomoea trifida had a dual role in the origin of sweet potato, first as its progenitor and second as the species with which sweet potato introgressed so one of its lineages could capture an I. trifida chloroplast. In addition, we provide evidence that sweet potato was present in Polynesia in pre-human times. This, together with several other examples of long-distance dispersal in Ipomoea, negates the need to invoke ancient human-mediated transport as an explanation for its presence in Polynesia. These results have important implications for understanding the origin and evolution of a major global food crop and question the existence of pre-Columbian contacts between Polynesia and the American continent.
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Papers共 227 篇Author StatisticsCo-AuthorSimilar Experts
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Erick C. Deloya Brito, Cameron Clay,Patrick J. McIntyre, Itzel A. Pina-De la Rosa,Robert W. Scotland,Pablo Munoz-Rodriguez,N. Ivalu Cacho
Botanical sciences/Botanical sciencesno. 4 (2023): 1016-1033
New Zealand science reviewno. 1 (2023): 24-24
Molecular Phylogenetics and Evolution (2023): 107861-107861
J. Open Source Softw.no. 87 (2023): 5418-5418
Taxonno. 3 (2023): 644-646
Taxonno. 6 (2023): 1201-1215
Zoological Systematicsno. 2 (2022)
Pablo Muñoz-Rodríguez,John R.I. Wood, Lucía Villaescusa González,Charles C. Davis,Zoë A. Goodwin,Robert W. Scotland
Harvard Papers in Botany (2022)
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#Papers: 237
#Citation: 5219
H-Index: 35
G-Index: 70
Sociability: 6
Diversity: 2
Activity: 37
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