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Phylogenomic analysis points to a South American origin of Manihot and illuminates the primary gene pool of cassava
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Simon, Marcelo F., Mendoza, J Moises F., Liu, Hsiao-Lei, Martins, Márcio Lacerda Lopes, Drovetski, Sergei V., Przelomska, Natalia A. S., Loiselle, Hope, Cavalcanti, Taciana B., Inglis, Peter W, Mueller, Natalie G., Allaby, Robin G., de Oliveira Freitas, Fábio and Kistler, Logan (2022) Phylogenomic analysis points to a South American origin of Manihot and illuminates the primary gene pool of cassava. The New Phytologist, 233 (6). pp. 534-545. doi:10.1111/nph.17743 ISSN 1469-8137.
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Official URL: https://doi.org/10.1111/nph.17743
Abstract
The genus Manihot, with around 120 known species, is native to a wide range of habitats and regions in the tropical and subtropical Americas. Its high species richness and recent diversification only ~6Mya have significantly complicated previous phylogenetic analyses. Several basic elements of Manihot evolutionary history therefore remain unresolved. Here, we conduct a comprehensive phylogenomic analysis of Manihot, focusing on exhaustive sampling of South American taxa. We find that two recently described species from northeast Brazil's Atlantic forest were the earliest to diverge, strongly suggesting a South American common ancestor of Manihot. Ancestral state reconstruction indicates early Manihot diversification in dry forests, with numerous independent episodes of new habitat colonization including into savannas and rainforests within South America. We identify the closest wild relatives to M. esculenta including the crop cassava, and we quantify extensive wild introgression into the cassava gene pool from at least five wild species including M. glaziovii, a species used widely in breeding programs. Finally, we show that this wild-to-crop introgression substantially shapes the mutation load in cassava. Our findings provide a detailed case study for neotropical evolutionary history in a diverse and widespread group, and a robust phylogenomic framework for future Manihot and cassava research.
Item Type: | Journal Article | ||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Life Sciences (2010- ) | ||||||||
SWORD Depositor: | Library Publications Router | ||||||||
Journal or Publication Title: | The New Phytologist | ||||||||
Publisher: | Wiley-Blackwell Publishing Ltd. | ||||||||
ISSN: | 1469-8137 | ||||||||
Official Date: | March 2022 | ||||||||
Dates: |
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Volume: | 233 | ||||||||
Number: | 6 | ||||||||
Page Range: | pp. 534-545 | ||||||||
DOI: | 10.1111/nph.17743 | ||||||||
Status: | Peer Reviewed | ||||||||
Publication Status: | Published | ||||||||
Access rights to Published version: | Restricted or Subscription Access |
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