Brassica U Triangle

The relationship between these six species have been illustrated through the Brassica U-triangle 28. Here the high-quality genome sequence of B.

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The Us triangle model describes the relationship among brassica crops Six species of the genus Brassica are used widely throughout the world as oilseed condiments fodder or vegetable crops.

Brassica u triangle. Characterization revealed a genome anchored to 17 chromosomes with a total length of 1087 Gb and an N50 scaffold length of 6. The genomic constitution of the species is described with the letters A B and C each letter representing a haploid genome. It has since been confirmed by studies of DNA and proteins.

Nigra represents the B genome of Us triangle and is one of the progenitor species of B. Also shown are three allotetraploid species Brassica juncea Brassica napus and Brassica carinata which are hybrid combinations of the basic genomes. It appears that if errors in homology of co-migrating DNA bands are random this will have little effect on the relative similarities and on PCO ordination.

However the basic U triangle of relationships among these six Brassica species was maintained. The theory states that the genomesof three ancestral species of Brassicacombined to create three of the common modern vegetablesand oilseedcrop species. Napus AC and B.

In the case of Brassicaallohexaploids all six species in the Triangle of U contain genetic variants and agronomic traits of interest reviewed by Katche et al. Another allotetraploid taxon Brassica napuscv. Rapaand Brassica oleraceaole andor have undergone an extra hybridization events along its evolutionary history.

Oleracea C yielded three different pair-wise amphidiploids. Brassica species also known as Us triangle. Juncea AABB an important oilseed crop of the Indian subcontinent.

Three diploid species Brassica rapa Brassica nigra and Brassica oleracea which represent the AA BB and CC genomes are shown. Napus but later than B. Brassica carinata was deduced to have formed 0047 Mya which is slightly earlier than B.

Nigra B and B. N refers to the haploid number of chromosomes. Ethiopian mustard Brassica carinata in the Brassicaceae family possesses many excellent agronomic traits.

This helps explain the successful use of. Adapted from Purty et al. Wester may have been maternally derived from the common ancestor of B.

The Brassica genus comprises various important species of which three diploid species B. The characteristics of Brassicamt genomic structures also supported the phylogenetic results. According to Morinaga 1934 and U 1935.

Brassica nigra BB also called black mustard is grown as a condiment crop in India. Brassica carinata shares one whole-genome triplication event with the five other species in Us triangle a classic model of evolution and polyploidy in Brassica. Carinata BC showing the triangle of U.

Rapa A genome B. The concept of Us triangle which revealed the importance of polyploidization in plant genome evolution described natural allopolyploidization events in Brassica using three diploids. Brassica species within the triangle of U.

Although DNA sequences of many genes have been analyzed to reveal the relationships between A B and C genomes the. This group of species provides an excellent model for studies on species evolution by homologous recombination and polyploidization. The triangle of Uis a theory about the evolution and relationships between members of the plantgenusBrassica.

The BGD Brassica Genomics Database is mainly contained the genomics data from six Brassica Us triangle species including three diploid species Brassica rapa AA 2n2x20 Brassica nigra BB 2n2x16 and Brassica oleracea CC 2n2x18 and three tetraploid species Brassica napus AACC 2n4x38 Brassica juncea AABB 2n4x36 and B. Brassica carinata genome characterization clarifies Us triangle model of evolution and.

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