Chromosome triplication found across the tribe Brassiceae.

By M. Lysak, Marcus A. Koch, A. Pečinka, I. Schubert. Genome Research, 2005

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We have used an approximately 8.7-Mb BAC contig of Arabidopsis thaliana Chromosome 4 to trace homeologous chromosome regions in 21 species of the family Brassicaceae. Homeologs of this segment could be identified in all tested species. Painting of pachytene chromosomes of Calepina, Conringia, and Sisymbrium species (2n = 14, 16), traditionally placed in tribe Brassiceae, showed one homeologous copy of the Arabidopsis contig, while the remaining taxa of the tribe (2n = 14-30) revealed three, and three Brassica species (2n = 34, 36, and 38) and Erucastrum gallicum (2n = 30) had six copies corresponding to the 8.7-Mb segment. The multiple homeologous copies corresponded structurally to the Arabidopsis segment or were rearranged by inversions and translocations within the diploidized genomes. These chromosome rearrangements accompanied by chromosome fusions/fissions led to the present-day chromosome number variation within the Brassiceae. Phylogenetic relationships based on the chloroplast 5'-trnL (UAA)-trnF(GAA) region and estimated divergence times based on sequence data of the chalcone synthase gene are congruent with comparative painting data and place Calepina, Conringia, and Sisymbrium outside the clade of Brassiceae species with triplicated genomes. Most likely, species containing three or six copy pairs descended from a common hexaploid ancestor with basic genomes similar to that of Arabidopsis. The presumed hexaploidization event occurred after the Arabidopsis-Brassiceae split, between 7.9 and 14.6 Mya.

Subfields: Ecology, Evolution, Behavior and Systematics, Molecular Biology, Plant Science

View Paper: https://www.semanticscholar.org/paper/1ede75c39599b3058c3afc83f6a9f5481b67af2e

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Citations in the corpus

Interspecific Hybridization for Brassica Crop Improvement (2019, background): “Other genebanks include the United States Department of Agriculture (USDA) (https://www.ars-grin.gov/npgs/) in the United States, the Australian Grains Genebank (https://grdc.com.au/ resources-and-publications/groundcover/gc110/australian-genebank), and the Nordic Genetic Resource Centre (NordGen) (”
Evolution of Gene Duplication in Plants1[OPEN] (2016, background): “In some cases, WGD events involve genome triplication, as is the case for Brassica rapa (Lysak et al., 2005), the wild radish 2296 Plant Physiol.”
Trigenomic Bridges for Brassica Improvement (2011, methodology): “…tribe Brassiceae (including the Brassica species of the triangle of U) descended from a single hexaploid ancestor (Lagercrantz and Lydiate, 1996; Lysak et al., 2005; Parkin et al., 2005; Mandakova and Lysak, 2008; Nelson et al., 2011), although some authors have questioned the strength of this…”
Contribution to ITS phylogeny of the Brassicaceae, with special reference to some Asian taxa (2009, background): “Calepina and Conringia formed a well-supported monophyletic group in Warwick and Sauder (2005) but not in Lysak et al. (2005), who suggested that this discrepancy in the ITS phylogeny probably resulted from concerted evolution.”
Genetics and breeding for clubroot resistance in Canadian spring canola (Brassica napus L.) (2014, background): “This genome is quite distinct from the other Brassica genomes (Song et al. 1988; Lysak et al. 2005), with chromosomes showing very little pairing with either the A or C genome chromosomes (Busso et al. 1987; Mason et al. 2010).”