植物分类学报

• 研究论文 • 上一篇    下一篇

华北落叶松小孢子母细胞(PMC)减数分裂和花粉的发育

1张守攻; 1杨文华; 2李懋学; 3韩素英; 1王建华; 1孙晓梅; 1王笑山; 1齐力旺*   

  1. 1(中国林业科学研究院林业研究所 北京 100091)
    2(北京大学生命科学学院 北京 100871)
    3(中国林业科学研究院森林生态环境与保护研究所重点实验室 北京 100091)
  • 收稿日期:2006-08-14 修回日期:2007-03-19 出版日期:2007-07-18 发布日期:2007-07-18
  • 通讯作者: 齐力旺 E-mail:lwqi@caf.ac.cn

Studies on the pollen mother cell meiosis and pollen development of Larix principis-rupprechtii

1ZHANG Shou-Gong, 1YANG Wen-Hua, 2 LI Mao-Xue, 3HAN Su-Ying, 1WANG Jian-Hua, 1SUN Xiao-Mei, 1WANG Xiao-Shan, 1QI Li-Wang*   

  1. 1(Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China)
    2(College of Life Sciences, Peking University, Beijing 100871, China)
    3(Key Laboratory of Research Institute of Forest Ecology, Environment and Protection,
    Chinese Academy of Forestry, Beijing 100091, China)
  • Received:2006-08-14 Revised:2007-03-19 Online:2007-07-18 Published:2007-07-18
  • Contact: QI Li-Wang E-mail:lwqi@caf.ac.cn

Abstract: Using the squash method for chromosomes, cytological characters in pollen
mother cells (PMC) and pollen development traits of Larix principis-rupprechtii were
investigated. Our results showed that the PMC meiosis of L. principis-rupprechtii began in
autumn, remained at the diffuse diplotene stage through the dormancy of the plant during
winter and re-started the next spring to complete the process. It is mainly characterized by the
lack of synchronization of meiosis in the same anther and by the relatively quick processes of
every meiosis stage. After the re-start of meiosis, all the PMCs reached the tetrad stage within
three days. The main configuration of bivalents were rings caused by more than two
chromosome exchanges on the arms. Rod-bivalents produced by chromosome exchange on
only one arm were rarely observed in a few cells. The average configuration was
10.62II+1.38I. Of meiosis Metaphase II, there were patterns of parallel or perpendicularity,
forming eudipleural or tetrahedral tetrads, which are also the major tetrad types in the
monocots and dicots. After one week at the tetrad stage, callose cell walls started to dissolve,
then the four cells separated, and dispersed into the pollen cell, forming independent
single-nucleus pollen grains. Afterwards, the haploid nucleolus underwent further cycles of
mitotic division, resulting in the formation of five-celled pollen with two prothallial cells, one
tube cell, one stalk cell and one body cell.

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