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Table 4 Comparison of the degree of conservation between duplicated groups originating from different polyploidy events in B. rapa and B. oleracea

From: Genome-wide comparative analysis of the Brassica rapa gene space reveals genome shrinkage and differential loss of duplicated genes after whole genome triplication

  Number of groups produced Number of genes* Degree of conservation
Duplication event   Total Unpaired Conserved (%)
B. rapa      
   3R event 33 2,017 1,623 394 19.5
   4R event 18 (3) 651 (112) 367 (58) 284 (54) 43.6 (48.2)
   Segmental duplication 1 (1) 24 (28) 4 (0) 20 (28) 83.3 (100)
B. oleracea      
   3R event 9 310 196 114 36.8
   4R event 6 217 81 136 62.7
  1. Data in parentheses are those from the Flowering Locus C (FLC) regions [20]. *Tandem duplicated genes were considered to be a single homolog. The degree of conservation was calculated by dividing the number of conserved genes by the total number of genes. Information about the Bo genome was obtained from the report of Town et al. [19].