Details of the record

TitleGene loss and silencing in Tragopogon miscellus(Asteraceae): comparison of natural and synthetic allotetraploids
AuthorsRJA Buggs, AN Doust, JA Tate1, J Koh, K Soltis, FA Feltus, AH Paterson, PS Soltis
and DE Soltis
PublicationHeredity (2009), 1-9
AbstractWhole-genome duplication (polyploidisation) is a widespread
mechanism of speciation in plants. Over time, polyploid
genomes tend towards a more diploid-like state, through
downsizing and loss of duplicated genes (homoeologues),
but relatively little is known about the timing of gene loss
during polyploid formation and stabilisation. Several studies
have also shown gene transcription to be affected by
polyploidisation. Here, we examine patterns of gene loss in
10 sets of homoeologues in five natural populations of the
allotetraploid Tragopogon miscellus that arose within the
past 80 years following independent whole-genome duplication
events. We also examine 44 first-generation synthetic
allopolyploids of the same species. No cases of homoeologue
loss arose in the first allopolyploid generation, but after
80 years, 1.6% of homoeologues were lost in natural
populations. For seven homoeologue sets we also examined
transcription, finding that 3.4% of retained homoeologues
had been silenced in the natural populations, but none in the
synthetic plants. The homoeologue losses and silencing
events found were not fixed within natural populations and
did not form a predictable pattern among populations. We
therefore show haphazard loss and silencing of homoeologues,
occurring within decades of polyploid formation in
T. miscellus, but not in the initial generation.

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