Trigenomic bridges for Brassica improvement

Chen, Sheng, Nelson, Matthew N., Chèvre, Anne-Marie, Jenczewski, Eric, Li, Zaiyun, Mason, Annaliese S., Meng, Jinling, Plummer, Julie A., Pradhan, Aneeta, Siddique, Kadambot H. M., Snowdon, Rod J., Yan, Guijun, Zhou, Weijun and Cowling, Wallace A. (2011) Trigenomic bridges for Brassica improvement. Critical Reviews In Plant Sciences, 30 6: 525-547. doi:10.1080/07352689.2011.615700

Author Chen, Sheng
Nelson, Matthew N.
Chèvre, Anne-Marie
Jenczewski, Eric
Li, Zaiyun
Mason, Annaliese S.
Meng, Jinling
Plummer, Julie A.
Pradhan, Aneeta
Siddique, Kadambot H. M.
Snowdon, Rod J.
Yan, Guijun
Zhou, Weijun
Cowling, Wallace A.
Title Trigenomic bridges for Brassica improvement
Formatted title
Trigenomic bridges for Brassica improvement
Journal name Critical Reviews In Plant Sciences   Check publisher's open access policy
ISSN 0735-2689
Publication date 2011
Sub-type Critical review of research, literature review, critical commentary
DOI 10.1080/07352689.2011.615700
Volume 30
Issue 6
Start page 525
End page 547
Total pages 24
Place of publication Philadelphia, PA, U.S.A.
Publisher Taylor & Francis
Collection year 2012
Language eng
Formatted abstract
We introduce and review Brassica crop improvement via trigenomic bridges. Six economically important Brassica species share three major genomes (A, B, and C), which are arranged in diploid (AA, BB, and CC) and allotetraploid (AABB, AACC, and BBCC) species in the classical triangle of U. Trigenomic bridges are Brassica interspecific hybrid plants that contain the three genomes in various combinations, either triploid (ABC), unbalanced tetraploid (e.g., AABC), pentaploid (e.g., AABCC) or hexaploid (AABBCC). Through trigenomic bridges, Brassica breeders can access all the genetic resources in the triangle of U for genetic improvement of existing species and development of new agricultural species. Each of the three Brassica genomes occurs in several species, where they are distinguished as subgenomes with a tag to identify the species of origin. For example, the A subgenome in B. juncea (2n = AABB) is denoted as Aj and the A subgenome in B. napus (2n = AACC) as An. Trigenomic bridges have been used to increase genetic diversity in allopolyploid Brassica crop species, such as a new-type B. napus with subgenomes from B. rapa (Ar) and B. carinata (Cc). Recently, trigenomic bridges from several sources have been crossed together as the ‘founders’ of a potentially new allohexaploid Brassica species (AABBCC). During meiosis in a trigenomic bridge, crossovers are expected to form between homologous chromosomes of related subgenomes (for example Ar and An), but cross-overs may also occur between non-homologous chromosomes (for example between A and C genome chromosomes). Irregular meiosis is a common feature of new polyploids, and any new allotetraploid or allohexaploid Brassica genotypes derived from a trigenomic bridge must achieve meiotic stability through a process of diploidisation. New sequencing technologies, at the genomic and epigenomic level, may reveal the genetic and molecular basis of diploidization, and accelerate selection of stable allotetraploids or allohexaploids. Armed with new genetic resources from trigenomic bridges, Brassica breeders will be able to improve yield and broaden adaptation of Brassica crops to meet human demands for food and biofuel, particularly in the face of abiotic constraints caused by climate change.
Keyword Rapeseed
Interspecific hybridization
AABBCC genome
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Critical review of research, literature review, critical commentary
Collections: Non HERDC
School of Agriculture and Food Sciences
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Citation counts: TR Web of Science Citation Count  Cited 26 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 27 times in Scopus Article | Citations
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Created: Thu, 15 Mar 2012, 11:39:19 EST by Annaliese Mason on behalf of School of Agriculture and Food Sciences