Phenotypic trait variation in the North American Tragopogon allopolyploid complex

Premise Recently formed allopolyploids Tragopogon mirus and T. miscellus and their diploid parental species, T. dubius, T. porrifolius, and T. pratensis, offer a rare opportunity to study the earliest stages of allopolyploidy. The allopolyploid species have also been resynthesized, allowing comparis...

Full description

Saved in:
Bibliographic Details
Published in:American journal of botany 2023-07, Vol.110 (7), p.e16189-n/a
Main Authors: Jordon‐Thaden, Ingrid E., Spoelhof, Jonathan P., Viccini, Lyderson Facio, Combs, Joseph, Gomez, Francisco, Walker, Imari, Soltis, Douglas E., Soltis, Pamela S.
Format: Article
Language:English
Subjects:
allopolyploid
Allopolyploidy
Asteraceae
common garden
Diploids
Evolution & development
Fitness
hybridization
phenotype
Phenotypes
Phenotypic variations
Photosynthesis
physiology
Polyploidy
Reproductive fitness
Species
Tragopogon
Tragopogon miscellus
WGD
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Premise Recently formed allopolyploids Tragopogon mirus and T. miscellus and their diploid parental species, T. dubius, T. porrifolius, and T. pratensis, offer a rare opportunity to study the earliest stages of allopolyploidy. The allopolyploid species have also been resynthesized, allowing comparisons between the youngest possible allopolyploid lineages and their natural, established counterparts. For the first time, we compared phenotypic traits on a large scale in Tragopogon diploids, natural allopolyploids, and three generations of synthetic allopolyploids. Methods Our large common‐garden experiment measured traits in growth, development, physiology, and reproductive fitness. We analyzed trait differences between allopolyploids and their parental species, and between synthetic and natural allopolyploids. Results As in many polyploids, the allopolyploid species had some larger physical traits and a higher capacity for photosynthesis than diploid species. Reproductive fitness traits were variable and inconsistent. Allopolyploids had intermediate phenotypes compared to their diploid parents in several traits, but patterns of variation often varied between allopolyploid complexes. Resynthesized and natural allopolyploid lines generally showed minor to nonexistent trait differences. Conclusions In Tragopogon, allopolyploidy results in some typical phenotypic changes, including gigas effects and increased photosynthetic capacity. Being polyploid did not produce a significant reproductive advantage. Comparisons between natural and synthetic T. mirus and T. miscellus are consistent with very limited, idiosyncratic phenotypic evolution following allopolyploidization.
ISSN:0002-9122
1537-2197
DOI:10.1002/ajb2.16189