Abstract
Dispensable B chromosomes are the most enigmatic components of many eukaryotic genomes, including thousands of plant species. Since their discovery more than a century ago, the origin, genetic content and the mechanisms by which they remain in populations have been long-standing questions. In this regard, the B chromosome of rye (Secale cereale) was the first for which these questions have been addressed using a combination of modern laboratory and bioinformatic tools. In this review, our current understanding of how the rye B chromosome originated and the cellular mechanisms of its post-meiotic drive will be summarized. Besides, the DNA and chromatin composition, the transcriptional activity of the rye B and its effects on the host genome are discussed. Potential applications of the rye B are evaluated.
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Acknowledgements
We thank our colleagues and reviewers for their helpful suggestions, insightful comments and discussions on this review. This work was supported by the Deutsche Forschungsgemeinschaft DFG (HO1779/30-1) and China CSC Scholarship.
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Houben, A., Ma, W., Banaei-Moghaddam, A.M. (2021). The B Chromosome of Rye. In: Rabanus-Wallace, M.T., Stein, N. (eds) The Rye Genome. Compendium of Plant Genomes. Springer, Cham. https://doi.org/10.1007/978-3-030-83383-1_4
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