Wei Lu1, Jun Liu, Qiang Xin, Lili Wan, Dengfeng Hong, Guangsheng Yang. 1. National Key Laboratory of Crop Genetic Improvement, Key Laboratory of Rapeseed Genetic Improvement (Ministry of Agriculture), Huazhong Agricultural University, Wuhan, China.
Abstract
BACKGROUND AND AIMS: Spontaneous male sterility is an advantageous trait for both constructing efficient pollination control systems and for understanding the developmental process of the male reproductive unit in many crops. A triallelic genetic male-sterile locus (BnMs5) has been identified in Brassica napus; however, its complicated genome structure has greatly hampered the isolation of this locus. The aim of this study was to physically map BnMs5 through an integrated map-based cloning strategy and analyse the local chromosomal evolution around BnMs5. METHODS: A large F(2) population was used to integrate the existing genetic maps around BnMs5. A map-based cloning strategy in combination with comparative mapping among B. napus, Arabidopsis, Brassica rapa and Brassica oleracea was employed to facilitate the identification of a target bacterial artificial chromosome (BAC) clone covering the BnMs5 locus. The genomic sequences from the Brassica species were analysed to reveal the regional chromosomal evolution around BnMs5. KEY RESULTS: BnMs5 was finally delimited to a 0·3-cM genetic fragment from an integrated local genetic map, and was anchored on the B. napus A8 chromosome. Screening of a B. napus BAC clone library and identification of the positive clones validated that JBnB034L06 was the target BAC clone. The closest flanking markers restrict BnMs5 to a 21-kb region on JBnB034L06 containing six predicted functional genes. Good collinearity relationship around BnMs5 between several Brassica species was observed, while violent chromosomal evolutionary events including insertions/deletions, duplications and single nucleotide mutations were also found to have extensively occurred during their divergence. CONCLUSIONS: This work represents major progress towards the molecular cloning of BnMs5, as well as presenting a powerful, integrative method to mapping loci in plants with complex genomic architecture, such as the amphidiploid B. napus.
BACKGROUND AND AIMS: Spontaneous male sterility is an advantageous trait for both constructing efficient pollination control systems and for understanding the developmental process of the male reproductive unit in many crops. A triallelic genetic male-sterile locus (BnMs5) has been identified in Brassica napus; however, its complicated genome structure has greatly hampered the isolation of this locus. The aim of this study was to physically map BnMs5 through an integrated map-based cloning strategy and analyse the local chromosomal evolution around BnMs5. METHODS: A large F(2) population was used to integrate the existing genetic maps around BnMs5. A map-based cloning strategy in combination with comparative mapping among B. napus, Arabidopsis, Brassica rapa and Brassica oleracea was employed to facilitate the identification of a target bacterial artificial chromosome (BAC) clone covering the BnMs5 locus. The genomic sequences from the Brassica species were analysed to reveal the regional chromosomal evolution around BnMs5. KEY RESULTS: BnMs5 was finally delimited to a 0·3-cM genetic fragment from an integrated local genetic map, and was anchored on the B. napus A8 chromosome. Screening of a B. napus BAC clone library and identification of the positive clones validated that JBnB034L06 was the target BAC clone. The closest flanking markers restrict BnMs5 to a 21-kb region on JBnB034L06 containing six predicted functional genes. Good collinearity relationship around BnMs5 between several Brassica species was observed, while violent chromosomal evolutionary events including insertions/deletions, duplications and single nucleotide mutations were also found to have extensively occurred during their divergence. CONCLUSIONS: This work represents major progress towards the molecular cloning of BnMs5, as well as presenting a powerful, integrative method to mapping loci in plants with complex genomic architecture, such as the amphidiploid B. napus.
Authors: Thomas Wicker; François Sabot; Aurélie Hua-Van; Jeffrey L Bennetzen; Pierre Capy; Boulos Chalhoub; Andrew Flavell; Philippe Leroy; Michele Morgante; Olivier Panaud; Etienne Paux; Phillip SanMiguel; Alan H Schulman Journal: Nat Rev Genet Date: 2007-12 Impact factor: 53.242
Authors: Isobel A P Parkin; Sigrun M Gulden; Andrew G Sharpe; Lewis Lukens; Martin Trick; Thomas C Osborn; Derek J Lydiate Journal: Genetics Date: 2005-07-14 Impact factor: 4.562
Authors: Michal Hála; Rex Cole; Lukás Synek; Edita Drdová; Tamara Pecenková; Alfred Nordheim; Tobias Lamkemeyer; Johannes Madlung; Frank Hochholdinger; John E Fowler; Viktor Zárský Journal: Plant Cell Date: 2008-05-20 Impact factor: 11.277
Authors: E S Lander; P Green; J Abrahamson; A Barlow; M J Daly; S E Lincoln; L A Newberg; L Newburg Journal: Genomics Date: 1987-10 Impact factor: 5.736
Authors: Liezhao Liu; Cunmin Qu; Benjamin Wittkop; Bin Yi; Yang Xiao; Yajun He; Rod J Snowdon; Jiana Li Journal: PLoS One Date: 2013-12-26 Impact factor: 3.240