Discovery and characterization of sweetpotato's closest tetraploid relative.

Autor: Muñoz-Rodríguez P; Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK., Wells T; Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK., Wood JRI; Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK.; Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, UK., Carruthers T; Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3AB, UK., Anglin NL; International Potato Center, Avenida La Molina 1895, Distrito de La Molina, Lima, 15023, Peru.; United States Department of Agriculture, 1109 Experiment Street, Griffin, GA, 30223, USA., Jarret RL; United States Department of Agriculture, 1109 Experiment Street, Griffin, GA, 30223, USA., Scotland RW; Department of Plant Sciences, University of Oxford, South Parks Road, Oxford, OX1 3RB, UK.
Jazyk: angličtina
Zdroj: The New phytologist [New Phytol] 2022 May; Vol. 234 (4), pp. 1185-1194. Date of Electronic Publication: 2022 Feb 08.
DOI: 10.1111/nph.17991
Abstrakt: The origin of sweetpotato, a hexaploid species, is poorly understood, partly because the identity of its tetraploid progenitor remains unknown. In this study, we identify, describe and characterize a new species of Ipomoea that is sweetpotato's closest tetraploid relative known to date and probably a direct descendant of its tetraploid progenitor. We integrate morphological, phylogenetic, and genomic analyses of herbarium and germplasm accessions of the hexaploid sweetpotato, its closest known diploid relative Ipomoea trifida, and various tetraploid plants closely related to them from across the American continent. We identify wild autotetraploid plants from Ecuador that are morphologically distinct from Ipomoea batatas and I. trifida, but monophyletic and sister to I. batatas in phylogenetic analysis of nuclear data. We describe this new species as Ipomoea aequatoriensis T. Wells & P. Muñoz sp. nov., distinguish it from hybrid tetraploid material collected in Mexico; and show that it likely played a direct role in the origin of sweetpotato's hexaploid genome. This discovery transforms our understanding of sweetpotato's origin.
(© 2022 The Authors. New Phytologist © 2022 New Phytologist Foundation.)
Databáze: MEDLINE
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