TY - JOUR
T1 - Additional origins of Ownbey's Tragopogon mirus
AU - Soltis, Douglas E.
AU - Mavrodiev, Evgeny V.
AU - Meyers, Stephen C.
AU - Severns, Paul M.
AU - Zhang, Linjing
AU - Gitzendanner, Matthew A.
AU - Ayers, Tina
AU - Chester, Michael
AU - Soltis, Pamela S.
N1 - Copyright:
Copyright 2012 Elsevier B.V., All rights reserved.
PY - 2012/6
Y1 - 2012/6
N2 - The allotetraploids (2n=24) Tragopogon mirus and T.miscellus have become textbook examples of recently and recurrently formed allopolyploids. Both species formed following the introduction of three diploids, T.dubius, T.porrifolius and T.pratensis (each with 2n=12), from Europe into the Palouse region of eastern Washington and adjacent Idaho, USA, in the early 1900s. The parentage of both allotetraploids is well documented (T.mirus=T.dubius×T.porrifolius; T.miscellus=T.dubius×T.pratensis), and both allotetraploids have formed repeatedly in the past approximately 80 years in the Palouse. On a larger geographical scale, T.mirus has also been reported from Flagstaff, Arizona (AZ), and more recently from Oregon (OR). However, the populations from OR and AZ have not been previously analysed with molecular markers to test the hypothesis of separate origin (vs. long-distance dispersal). Here, we show that both the AZ and OR collections of T.mirus combine distinctive parental genotypes and are genetically differentiated from the T.mirus genotypes found in the Palouse. The OR sample of T.mirus has a genetically distinct T.dubius contribution that forms a clade in our analyses with a sample of what has been referred to as T.major (now considered a subspecies of T.dubius). Consistent with other naturally occurring T.mirus populations, plastid sequences indicate that T.porrifolius was the maternal parent for both the AZ and OR collections. Microsatellite data are also consistent with local formation of T.mirus from co-occurring populations of T.dubius and T.porrifolius in OR and AZ. As with sequence data, T.dubius from OR is distinct from other samples of T.dubius at microsatellite loci, contributing a unique signature to T.mirus from this location. It will be useful to include these additional geographical origins of T.mirus, particularly the more genetically distant sample from OR, in ongoing investigations of the genetic and genomic consequences of recent allopolyploidy.
AB - The allotetraploids (2n=24) Tragopogon mirus and T.miscellus have become textbook examples of recently and recurrently formed allopolyploids. Both species formed following the introduction of three diploids, T.dubius, T.porrifolius and T.pratensis (each with 2n=12), from Europe into the Palouse region of eastern Washington and adjacent Idaho, USA, in the early 1900s. The parentage of both allotetraploids is well documented (T.mirus=T.dubius×T.porrifolius; T.miscellus=T.dubius×T.pratensis), and both allotetraploids have formed repeatedly in the past approximately 80 years in the Palouse. On a larger geographical scale, T.mirus has also been reported from Flagstaff, Arizona (AZ), and more recently from Oregon (OR). However, the populations from OR and AZ have not been previously analysed with molecular markers to test the hypothesis of separate origin (vs. long-distance dispersal). Here, we show that both the AZ and OR collections of T.mirus combine distinctive parental genotypes and are genetically differentiated from the T.mirus genotypes found in the Palouse. The OR sample of T.mirus has a genetically distinct T.dubius contribution that forms a clade in our analyses with a sample of what has been referred to as T.major (now considered a subspecies of T.dubius). Consistent with other naturally occurring T.mirus populations, plastid sequences indicate that T.porrifolius was the maternal parent for both the AZ and OR collections. Microsatellite data are also consistent with local formation of T.mirus from co-occurring populations of T.dubius and T.porrifolius in OR and AZ. As with sequence data, T.dubius from OR is distinct from other samples of T.dubius at microsatellite loci, contributing a unique signature to T.mirus from this location. It will be useful to include these additional geographical origins of T.mirus, particularly the more genetically distant sample from OR, in ongoing investigations of the genetic and genomic consequences of recent allopolyploidy.
KW - Allopolyploidy
KW - DNA sequence data
KW - Microsatellites
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U2 - 10.1111/j.1095-8339.2012.01244.x
DO - 10.1111/j.1095-8339.2012.01244.x
M3 - Article
AN - SCOPUS:84860523996
SN - 0024-4074
VL - 169
SP - 297
EP - 311
JO - Botanical Journal of the Linnean Society
JF - Botanical Journal of the Linnean Society
IS - 2
ER -