Extraction of the Constituent Subgenomes of the Natural Allopolyploid Rapeseed (Brassica napus L.)
文献类型： 外文期刊
作者： Zhu, Bin 1 ; Tu, Yuqin 2 ; Zeng, Pan 1 ; Ge, Xianhong 1 ; Li, Zaiyun 1 ;
作者机构： 1.Huazhong Agr Univ, Coll Plant Sci & Technol, Natl Key Lab Crop Genet Improvement, Natl Ctr Oil Crop Improvement Wuhan, Wuhan 430070, Peoples R China
2.Jiangxi Acad Agr Sci, Crop Res Inst, Nanchang 330200, Peoples R China
关键词： allopolyploid;Brassica napus;B. rapa;alien additional lines;aneuploid
期刊名称：GENETICS （ 影响因子：4.562； 五年影响因子：4.845 ）
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收录情况： SCI
摘要： As the dynamic nature of progenitor genomes accompanies the speciation by interspecific hybridization, the extraction of the constituent subgenome(s) from a natural allopolyploid species of long history and then restitution of the progenitor(s) provides the unique opportunity to study the genome evolution and interplay. Herein, the A subgenome from the allotetraploid oilseed rape (Brassica napus L., AACC) was extracted through inducing the preferential elimination of C-subgenome chromosomes in intertribal crosses and the progenitor B. rapa was restituted (RBR). Then by crossing and backcrossing RBR with B. napus donor, the C subgenome was in situ dissected by adding each of its nine chromosomes to the extracted A subgenome and establishing the whole set of monosonic alien addition lines (MAALs). RBR from spring-type B. napus genotype "Oro" expressed a phenotype resembling some type of B. rapa never observed before, but showed a winter-type flowering habit. This RBR had weaker growth vigor and suffered more seriously from biotic and abiotic stresses compared with Oro. The phenotypes specific for these MAALs showed the location of the related genes on the particular C-subgenome chromosomes. These MAALs exhibited obviously different frequencies in homeologous pairing and transmission of additional C-subgenome chromosomes, which were associated with the distinct degrees of their relatedness, and even with the possible genetic regulation for meiotic pairing evolved in B. napus. Finally, large scaffolds undetermined for sequence assembly of B. napus were anchored to specific C-subgenome chromosomes using MAALs.
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