Genome redundancy and plasticity within ancient and recent Brassica crop species

By Lewis Lukens, P. Quijada, Joshua Udall, J. C. Pires, M. Schranz, T. Osborn. 2004

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Polyploidy and angiosperm diversification. (2009, background): “1 ) and perhaps ancient hexaploids based on analyses of linkage maps with a number of genes clearly represented multiple times (e.g., Lagercrantz and Lydiate, 1996 ; Lukens et al., 2004 ).”
Chromosome triplication found across the tribe Brassiceae. (2005, background): “Thus, as concluded by Lukens et al. (2004), neither the evidence for an ancestral hexaploid genome nor alternative explanations such as the existence of a tetraploid ancestor and later segmental chromosomal duplications are convincing.”
Spartina anglica C. E. Hubbard: a natural model system for analysing early evolutionary changes that affect allopolyploid genomes. (2004, background): “Methylation changes in young (experimentally resynthesized) allopolyploids have been previously analysed using methylation-sensitive AFLP in Triticum (Shaked et al., 2001; Levy & Feldman, 2004), Gossypium (Liu et al., 2001; Adams & Wendel, 2004 ), Arabidopsis (Madlung et al., 2002; Chen et al., 2004”