Abstract
More than 400 pentatricopeptide repeat (PPR) genes have been found in higher plants, but most of them have not been functionally analyzed and their origins are still obscure. In this study, we performed phylogenetic genomewide comparisons of the PPR gene family in indica and japonica rice to explore the expansion mechanisms of these genes in higher plants. The functions of PPR genes in plant CMS/Rf systems are also discussed. The results indicate that (1) unequal crossing over participated in the expansion of the newly evolved PPR genes in indica and japonica rice genomes, (2) CMS/Rf systems are different in monocots and dicots, (3) the BT-type CMS/Rf system exists in both indica and japonica rice, and (4) both the PPR gene family and the BT-type CMS/Rf system may have existed before the divergence of indica and japonica rice.
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Acknowledgments
We are grateful to the editor and anonymous reviewers for many critical comments and suggestions on the manuscript. This research was supported by the National Natural Science Foundation of China (30860155) and the State Key Basic Research Program of China (2001CB108806).
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Shaobo Li and Qingping Sun contributed equally to this paper.
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Li, S., Sun, Q., Hu, M. et al. Phylogenetic Genomewide Comparisons of the Pentatricopeptide Repeat Gene Family in indica and japonica Rice. Biochem Genet 50, 978–989 (2012). https://doi.org/10.1007/s10528-012-9537-x
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DOI: https://doi.org/10.1007/s10528-012-9537-x