Analysis of meiotic behavior in three species of Epimedium (Berberidaceae)
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摘要: 采用去壁低渗法对3种淫羊藿属（Epimedium）植物川鄂淫羊藿（E.fargesii Franch）、黔岭淫羊藿（E.leptorrhizum Stearn）和柔毛淫羊藿（E.pubescens Maxim）的花粉母细胞进行了减数分裂观察。结果显示，3种植物的染色体数目均为2n=12，减数分裂过程中染色体的构型和行为特征也非常相似，减数分裂过程基本正常。但也发现一些染色体的异常行为，如二价体的提前分离、染色体桥、姐妹染色单体提前分离、染色体断片和二次分裂不同步等异常现象。这些减数分裂过程中的染色体变异可能在一定度上推动了淫羊藿属植物的系统发育和物种形成。Abstract: Detailed meiotic studies were performed on pollen mother cells of three Epimedium species (Berberidaceae), i.e., E. fargesii Franch, E. leptorrhizum Stearn, and E. pubescens Maxim, using wall degradation and hypotonic treatment. Results showed that the chromosome number for each of the three species was 2n = 12. Chromosome configurations and behaviors were very similar and most meiotic processes were normal. However, several abnormal meiotic behaviors were detected, including early separation of bivalents, chromosome bridges, early disjunction of sister chromatids, chromosome fragments, and asynchronous division. These chromosomal aberrations during meiosis may have induced the phylogenic evolution and speciation of Epimedium plants to a certain extent.
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Keywords:
- Epimedium /
- Meiosis /
- Chromosomal abnormality
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