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<p>Meiosis in <i>Tradescantia spathacea</i> (2n = 2x = 12) is characterized by the presence of complex rings/chains of 12 chromosomes, formed due to translocation heterozygosity involving all the 12 chromosomes of the diploid complement. However, the most remarkable feature noticed during this study has been the formation of small rings, constituting the haploid complement, at the two poles after anaphase I disjunction in 53.33% pollen mother cells. Interestingly, the rings at the two poles were discerned not only in cells showing regular disjunction of chromosomes and/or the poles that had received complete haploid set of 6 chromosomes, but it was also visible in cells with discordant segregation. Once chromosomes reached the poles, they aligned in a chain configuration which later assumed halo or wreath like circular configuration. The probable factor(s) responsible for this unique behavior of chromosomes at the two poles during anaphase I is discussed.</p>

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Unprecedented chromosome ring formation at anaphase poles during first reduction division in Tradescantia spathacea Sw.

  • 期刊论文

  • 发表日期：

    2025年12月26日

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  • Kuldeep Kumar Koul,
  • Ranjna Nagpal,
  • Anshul Dhyani

摘要

Meiosis in Tradescantia spathacea (2n = 2x = 12) is characterized by the presence of complex rings/chains of 12 chromosomes, formed due to translocation heterozygosity involving all the 12 chromosomes of the diploid complement. However, the most remarkable feature noticed during this study has been the formation of small rings, constituting the haploid complement, at the two poles after anaphase I disjunction in 53.33% pollen mother cells. Interestingly, the rings at the two poles were discerned not only in cells showing regular disjunction of chromosomes and/or the poles that had received complete haploid set of 6 chromosomes, but it was also visible in cells with discordant segregation. Once chromosomes reached the poles, they aligned in a chain configuration which later assumed halo or wreath like circular configuration. The probable factor(s) responsible for this unique behavior of chromosomes at the two poles during anaphase I is discussed.