4.7 Article

Comparative mitochondrial genome analysis reveals the evolutionary rearrangement mechanism in Brassica

Journal

PLANT BIOLOGY
Volume 18, Issue 3, Pages 527-536

Publisher

WILEY
DOI: 10.1111/plb.12414

Keywords

Brassica; heterosplasmic; mitochondrial genome evolution; sub-stoichiometric shifting

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Funding

  1. National Natural Science Foundation of China [31372063]

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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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