Chloroplast capture and range extension after hybridization in taro (Colocasia esculenta)

Chloroplast capture and range extension after hybridization in taro (Colocasia esculenta)

Complete chloroplast genomes of 17 samples from six species of Colocasia (Araceae) were sequenced, assembled, and aligned together with two previously reported complete genome sequences from taro (Colocasia esculenta). Analysis provides a well‐supported phylogenetic tree for taro and closely‐related...

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Published in:Ecology and evolution Vol. 14; no. 8; pp. e70082 - n/a
Main Authors: Matthews, P. J., Hossain, M. A., Sookchaloem, D., Nguyen, V. D., Wong, S. Y., Joling, J., Schranz, M. E., Bakker, F. T., Tabuchi, E., Ahmed, I., Hay, A.
Format: Journal Article
Language:English
Published: England John Wiley & Sons, Inc 01-08-2024
John Wiley and Sons Inc
Wiley
Subjects:
aroids
Chloroplasts
Colocasia
Colocasia esculenta
crop wild relatives
Cultivars
domestication
evolution
Gene sequencing
Genetic diversity
Genomes
Genomic analysis
Haplotypes
Hybridization
hybrids
introgression
Phylogenetics
Phylogeny
Population genetics
Population studies
Range extension
Species
Taro
Taxonomic revision
Taxonomy
Zoology
Asia
Southeast Asia
aroids
evolution
hybrids
introgression
crop wild relatives
domestication
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Summary:Complete chloroplast genomes of 17 samples from six species of Colocasia (Araceae) were sequenced, assembled, and aligned together with two previously reported complete genome sequences from taro (Colocasia esculenta). Analysis provides a well‐supported phylogenetic tree for taro and closely‐related wild Colocasia species in Southeast Asia. Two chloroplast lineages (CI and CII) form a well‐defined haplotype group and are found in cultivated taros known as var. esculenta (dasheen, CI), var. antiquorum (eddoe, CII), and in a widespread, commensal wild form known as var. aquatilis (CI). A third lineage (CIII) is also found in wild taros known as var. aquatilis and in the wild species C. lihengiae, C. formosana, and C. spongifolia. We suggest three different scenarios to explain the grouping of CIII wild taros (C. esculenta) with other wild Colocasia species. Chloroplast lineages CI and CIII in C. esculenta and an unknown parent species may be involved in an as yet undated history of hybridization, chloroplast capture, and range extension. Substantial taxonomic revision may be needed for C. esculenta after further studies of morphological and genetic diversity within the crop, in wild populations, and in closely related wild species. The results also point to the Bengal delta as a region of key interest for future research on the origins of tropical wetland taros. Complete chloroplast genome sequences from wild and cultivated taro (Colocasia esculenta) and closely related Colocasia species provide a well‐supported phylogenetic tree with three main chloroplast lineages. Two of these (CI and CIII) appear to be involved in an ancient history of hybridization, chloroplast capture, and range extension. Tropical wetland cultivars (CI, Type I haplotype) may originate in the Bengal delta region, where wild CI sister lineages were found. C. oresbia, a geographical isolate in island Southeast Asia (see figure), appears to be a near outgroup.
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ISSN:2045-7758
2045-7758
DOI:10.1002/ece3.70082