Abstract
Plant mitochondrial genomes contain a large number of mitotype-specific sequences (MSS) which establish a mitochondrial genome structure distinct from other mitotypes. In rice, nine mitochondrial genomes have been sequenced, which provides us with the possibility of characterizing the MSS of rice and probing their relationship to cytoplasmic male sterility (CMS) in rice. We therefore analyzed the mitochondrial genomes of CW-CMS, LD-CMS, WA-CMS, N and Nipponbare lines, and found 57 MSS with sizes ranging from 102 to 5,745 bp, and with an aggregate length of 92.4 kb. The MSS account for more than 14.5 % of the rice mitochondrial genome and are a significant contributing factor in the variation of mitochondrial genome sizes. Of the MSS tested, 34 MSS exhibited polymorphism among rice lines, and 14 MSS were further confirmed as being specific to CMS. This includes nine MSS specific to sporophytic CMS, three specific to gametophytic CMS, and two shared by all types of CMS. Interestingly, except for CMS genes orf(H)79 and orf352 which are partly or fully overlapping with some MSS fragments, there are ten more open reading frames of unknown function that were detected in CMS-specific MSS, hinting at their possible roles in plant CMS. These novel findings provide us with potential new molecular tools to direct the breeding of CMS lines in hybrid rice breeding programs.
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This work was supported by the National Natural Science Foundation (31071391) and the 973 Program (2011CB100102) of China.
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Xie, H., Wang, J., Qian, M. et al. Mitotype-specific sequences related to cytoplasmic male sterility in Oryza species. Mol Breeding 33, 803–811 (2014). https://doi.org/10.1007/s11032-013-9993-y
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DOI: https://doi.org/10.1007/s11032-013-9993-y