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Microtubule Distribution and Change during Meiosis of Microspore Mother Cells of Nicotiana tabacum L.
Ya-Ying Wang1, Ya-Nan Zhang2, Hong-Yi Wang3, Shi-Ming Lin3, Hui-Qiao Tian2*
1Xiamen Medical College, Xiamen 361008, China; 2School of Life Science, Xiamen University,Xiamen 361005, China; 3Xiamen Entry-Exit Inspection and Quarantine Bureau, Inspection and Quarantine Technology Center, Xiamen 36102
Abstract: The organization of microtubule cytoskeleton during tobacco microsporogenesis was observed. At the prophase of meiosis I of microspore mother cell (MMC)， the microtubules in the cell are short and dispersive in cytoplasm. At the metaphase of meiosis I， the microtubules in the cell set up a spindle which makes chromosomes move at equatorial plate. When MMCs enter the anaphase of meiosis I， the spindle microtubules break. At the metaphase of meiosis II， the microtubules form two spindles in the same cytoplasm. In the telophase of meiosis II， spindle microtubules depolymerize and change from short segment to tubulin. Then the MMC begins to cytokinesis by cytoplasmic constriction to form contractile furrows， which separate four nuclei into four microspores. There was not evidence to show that microtubules participate in the cytokinesis directly.
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