玉兰减数分裂观察及染色体构型分析
文献类型：期刊论文
| 作者 | 李建强; 何子灿 |
| 刊名 | 植物分类学报
 |
| 出版日期 | 2003 |
| 卷号 | 41期号:4页码:362 |
| ISSN号 | 0529-1526 |
| 英文摘要 | Cytological characters of Magnolia denudata in mitosis and meiosis were investigated using the method of wall degradation and hypotonic treatment of making chromosomal preparations. It was confirmed that two chromosome numbers, tetraploid (2n = 4x = 76) and hexaploid (2n = 6x = 114), were present in M. denudata. This was unusual in the genus Magnolia and even in the family Magnoliaceae in which usually only one chromosome number was observed in one species. The resting nuclei belonged to the complex chromocenter type. The chromosomes at mitotic metaphase are small in size. The configurations at meiotic metaphase I were various in different cells, being characterized mainly by the higher frequency of bivalents than expected for an autopolyploid, and also by the occurrence of one or two circle and/or chain hexavalents at metaphase I. The features of configuration at meiotic metaphase I in M. denudata are similar to those in Sequoia sempervirens and Hordeum violaceum. The former is a segmental allohexaploid or an autoallohexaploid and the later is a segmental allotetraploid. M. denudata is possibly a segmental allohexaploid. No chromatin bridges or lagging chromosomes were observed and chromatin fragments only appeared in a few cells. At anaphase I, nine of 75 cells and at anaphase II, one of 15 cells had fragments which accounted for 12% and 6.7% respectively. The rate of sterile pollen grains was 6.6%. The process in meiosis of pollen mother cell in M. denudata might be basically normal. |
| 语种 | 英语 |
| 源URL | [http://202.127.146.157/handle/2RYDP1HH/12253]  |
| 专题 | 中国科学院武汉植物园 |
| 作者单位 | 中国科学院武汉植物园 |
| 推荐引用方式 GB/T 7714 | 李建强,何子灿. 玉兰减数分裂观察及染色体构型分析[J]. 植物分类学报,2003,41(4):362. |
| APA | 李建强,&何子灿.(2003).玉兰减数分裂观察及染色体构型分析.植物分类学报,41(4),362. |
| MLA | 李建强,et al."玉兰减数分裂观察及染色体构型分析".植物分类学报 41.4(2003):362. |
入库方式： OAI收割
来源：武汉植物园
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