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Non-homologous chromosome pairing during meiosis in haploid Brassica rapa

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Abstract

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Cytological observations of chromosome pairing showed that evolutionarily genome duplication might reshape non-homologous pairing during meiosis in haploid B. rapa.

Abstract

A vast number of flowering plants have evolutionarily undergone whole genome duplication (WGD) event. Typically, Brassica rapa is currently considered as an evolutionary mesohexaploid, which has more complicated genomic constitution among flowering plants. In this study, we demonstrated chromosome behaviors in haploid B. rapa to understand how meiosis proceeds in presence of a single homolog. The findings showed that a diploid-like chromosome pairing was generally adapted during meiosis in haploid B. rapa. Non-homologous chromosomes in haploid cells paired at a high-frequency at metaphase I, over 50% of examined meiocytes showed at least three pairs of bivalents then equally segregated at anaphase I during meiosis. The fluorescence immunostaining showed that the cytoskeletal configurations were mostly well-organized during meiosis. Moreover, the expressed genes identified at meiosis in floral development was rather similar between haploid and diploid B. rapa, especially the expression of known hallmark genes pivotal to chromosome synapsis and homologous recombination were mostly in haploid B. rapa. Whole-genome duplication evolutionarily homology of genomic segments might be an important reason for this phenomenon, which would reshape the first division course of meiosis and influence pollen development in plants.

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Availability of data and materials

The datasets presented in this study can be found in online repositories. The names of the repository/repositories and accession number(s) can be found below: (National Center for Biotechnology Information (NCBI) BioProject number: PRJNA642307).

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Acknowledgements

This work was financially supported by the Program for Science & Technology Innovation Talents in Universities of Henan Province (No.19HASTIT014), Henan Provincial Science Foundation of China (No. 202300410366) and Youth Innovation Project of Key discipline of Zhengzhou University (No. XKZDQN202002).

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FW and BT conceived and instructed the study, GC and GS participated in the experiments, XW and XZ bred the plant materials, JY performed the experiments and data analysis, JY and YY wrote the manuscript, XS and ZH assisted with materials identification, JB assisted with analysis of bioinformatics. All authors read and approved the manuscript.

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Correspondence to Zhengqing Xie or Fang Wei.

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The authors declare that they have no conflict of interest.

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No human or animal participants were involved in this research.

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Communicated by Jinghua Yang.

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Yuan, J., Shi, G., Yang, Y. et al. Non-homologous chromosome pairing during meiosis in haploid Brassica rapa. Plant Cell Rep 40, 2421–2434 (2021). https://doi.org/10.1007/s00299-021-02786-2

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  • DOI: https://doi.org/10.1007/s00299-021-02786-2

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