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Karyotype Analysis and Cytological Study during Microsporogenesis of Narcissus tazetta var chinensis
Rui Wang, Lin-Jiao Cheng, Yu-Hui Zhao, Jian Wu, Hui-Qiao Tian*
Chinese narcissus; karyotype; microspore mother cell; meiosis; chromosome
Abstract: Chinese narcissus (Narcissus tazetta var. chinese Roem.) only blooms without seeds and it propagates using its bulbs. There were some different reports for its karyotype. Our result of karyotype analysis supports the viewpoint that Chinese narcissus belongs to triploid plant， and the karyotype leans to a heterogeneous triploid. During the meiosis of microspore mother cells (MMC)， the most cells display abnormal chromosomes: some chromosomes moved out of the spindle of the cell at metaphase; some chromosome bridges and lagging ones were formed at anaphase; and many microspores displayed the micronucleus at the telophase. The abnormality of chromosomes during MMC meiosis may induce microspore abortion during its development.
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