期刊
PLANT BIOLOGY
卷 18, 期 3, 页码 527-536出版社
WILEY
DOI: 10.1111/plb.12414
关键词
Brassica; heterosplasmic; mitochondrial genome evolution; sub-stoichiometric shifting
资金
- National Natural Science Foundation of China [31372063]
The genus Brassica has many species that are important for oil, vegetable and other food products. Three mitochondrial genome types (mitotype) originated from its common ancestor. In this paper, a B.nigra mitochondrial main circle genome with 232,407bp was generated through de novo assembly. Synteny analysis showed that the mitochondrial genomes of B.rapa and B.oleracea had a better syntenic relationship than B.nigra. Principal components analysis and development of a phylogenetic tree indicated maternal ancestors of three allotetraploid species in Us triangle of Brassica. Diversified mitotypes were found in allotetraploid B.napus, in which napus-type B.napus was derived from B.oleracea, while polima-type B.napus was inherited from B.rapa. In addition, the mitochondrial genome of napus-type B.napus was closer to botrytis-type than capitata-type B.oleracea. The sub-stoichiometric shifting of several mitochondrial genes suggested that mitochondrial genome rearrangement underwent evolutionary selection during domestication and/or plant breeding. Our findings clarify the role of diploid species in the maternal origin of allotetraploid species in Brassica and suggest the possibility of breeding selection of the mitochondrial genome.
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