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Abstract Detail


Teisher, Jordan [1], McKain, Michael [2], Kellogg, Elizabeth [3].

Phylogenomic Analysis of Polyploidy in “Reedy” Arundinoids (Poaceae).

Arundinoideae is the smallest subfamily in the crown grasses with only 40 species in 14 genera mostly distributed in the Paleotropics. Chloroplast sequence data suggest two independent transitions to the north temperate zone within the subfamily: one in the common ancestor of the genera Phragmites, Molinia, and Hakonechloa and the other in the genus Arundo. Phragmites and Arundo are both large-statured reeds and are the only genera in the subfamily to occur naturally in the Western Hemisphere, representing either convergent evolution or possible shared genomes resulting from hybridization. All four temperate arundinoid genera are polyploids, with ploidy levels ranging from 4x to 12x, supporting a possible history of hybridization in the subfamily. However, the origins of these subgenomes are unknown, and nuclear phylogenetic studies on the group are lacking. In this study, we present phylogenomic analyses of coding DNA sequences from newly generated transcriptomes of the four temperate arundinoid genera as well as published and unpublished transcriptomes and genomes from five other grass subfamilies. We find support for at least one whole genome duplication (WGD) shared by Phragmites, Molinia, and Hakonechloa as well as weaker support for another possible WGD shared by all sampled Arundinoideae. However, we do not find evidence of shared genomes between Arundo and Phragmites, suggesting that hybridization between the two taxa does not explain their morphological and ecological similarities.

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1 - The Academy Of Natural Sciences Of Drexel University, Botany, 1900 Benjamin Franklin Parkway, Philadelphia, PA, 19103, United States
2 - University Of Alabama, 411 Mary Harmon Bryant Hall, Tuscaloosa, AL, 35487, United States
3 - Donald Danforth Plant Science Center, 975 North Warson Road, St. Louis, MO, 63132, United States

Phragmites australis
Arundo donax

Presentation Type: Oral Paper
Session: 36, Phylogenomics III
Location: 107/Mayo Civic Center
Date: Wednesday, July 25th, 2018
Time: 10:15 AM
Number: 36008
Abstract ID:837
Candidate for Awards:None

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