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首页> 外文期刊>Journal of genetics >Amphitelic orientation of centromeres at metaphase I is an important feature for univalent-dependent meiotic nonreduction
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Amphitelic orientation of centromeres at metaphase I is an important feature for univalent-dependent meiotic nonreduction

机译：中期I着丝粒的两性定向是单价依赖性减数分裂非还原的重要特征

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Univalent-dependent meiotic nonreduction, which leads to the production of unreduced gametes, is thought to be the predominant mechanism underlying allopolyploid plant formation. However, little is known about the underlying cytological mechanism. In the present study, we observed male sporogenesis in F_1 amphihaploid hybrids of wheat–rye by FISH with the help of diagnostic PrCEN-1 specific for the rye centromere. Our observations indicated that at meiotic metaphase I, the chromosomes were accumulated on the equatorial plate. At this stage, the elongated centromeres were amphitelically oriented perpendicular to the equatorial plate, indicating tension from opposite poles. At late metaphase, the centromeres and sister chromatids started separating. Subsequently, the sister chromatids and centromeres split finally resulting in dyads. Our observations indicate that bipolar orientation of the sister kinetochores of univalents at the equatorial plate in metaphase I is important for the subsequent bipolar separation of sister chromatids in the first meiotic division.
机译：单价依赖性减数分裂非还原，导致未还原配子的产生，被认为是异源多倍体植物形成的主要机制。然而，关于潜在的细胞学机制知之甚少。在本研究中，我们借助针对黑麦着丝粒的诊断性PrCEN-1，通过FISH观察了小麦-黑麦F_1两亲性杂种的雄性孢子形成。我们的观察表明，在减数分裂中期I，染色体积累在赤道板上。在这一阶段，拉长的着丝粒垂直于赤道板两性取向，表明来自相反两极的张力。在中期晚期，着丝粒和姐妹染色单体开始分离。随后，姐妹染色单体和着丝粒分裂最终导致二元体。我们的观察结果表明，在中期I赤道板的单价姐妹动植物的双极定向对于随后的第一次减数分裂分裂中的姐妹染色单体的双极分离很重要。

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