Cytogenetic studies on Metasequoia glyptostroboides, a living fossil species
文献类型：期刊论文
| 作者 | He, ZC; Li, JQ; Cai, Q; Li, XD; Huang, HW |
| 刊名 | GENETICA
 |
| 出版日期 | 2004-11-01 |
| 卷号 | 122期号:3页码:269-276 |
| 关键词 | chromosome configuration and behavior ecological adaptation evolution meiosis Metasequoia glyptostroboides Hu et Cheng |
| ISSN号 | 0016-6707 |
| 英文摘要 | The chromosome morphology and meiotic pairing behavior in the pollen mother cells (PMCs) of Metasequoia glyptostroboides were investigated. The results showed that: (1) The chromosome number of the PMCs was 2n = 22. (2) The PMCs developed in the successive manner, and the nucleoids in the dynamic development were similar to those of the other gymnosperms. (3) At prophase, most of the chromosomes were unable to be identified distinctively because the chromosomes were long and tangled together. The chromosome segments were paired non-synchronously. At pachytene, the interstitial or terminal regions of some bivalents did not form synapsis and the paired chromosomes showed difference in sizes, indicating that there were structure differences between the homologous chromosomes. (4) At diakinesis, the ring bivalents showed complicated configurations due to the differences in location and number of chiasmata. In addition, there were cross-linked bivalents. (5) At metaphase I, the chromosome configuration of each cell was 8.2II(0) + 1.1II + 1.3II(+) + 0.8I. Most of the chromosomes were ring bivalents, but some were crosslinked bivalents, rod bivalents, or univalents. (6) 15% PMCs at anaphase I and 22% PMCs at anaphase II presented chromosome bridges, chromosome fragments, micronuclei, and lagging chromosomes. Twenty seven percent microspores finally moved into one to three micronuclei. Twenty five percent pollens were abortive. The results indicated that the observed individual of M. glyptostroboides was probably a parp-centric inversion heterozygote, and there were structural and behavioral differences between the homologous chromosomes. The chromosomal aberration of M. glyptostroboides may play an important role in the evolution of this relict species, which is known as a living fossil. Further evidence is needed to test whether the differences between homologous chromosomes were due to hybridization. |
| WOS研究方向 | Genetics & Heredity |
| 语种 | 英语 |
| WOS记录号 | WOS:000224991300007 |
| 出版者 | KLUWER ACADEMIC PUBL |
| 源URL | [http://202.127.146.157/handle/2RYDP1HH/1211]  |
| 专题 | 中国科学院武汉植物园 |
| 通讯作者 | He, ZC |
| 作者单位 | Chinese Acad Sci, Wuhan Bot Garden, Wuhan 430074, Peoples R China |
| 推荐引用方式 GB/T 7714 | He, ZC,Li, JQ,Cai, Q,et al. Cytogenetic studies on Metasequoia glyptostroboides, a living fossil species[J]. GENETICA,2004,122(3):269-276. |
| APA | He, ZC,Li, JQ,Cai, Q,Li, XD,&Huang, HW.(2004).Cytogenetic studies on Metasequoia glyptostroboides, a living fossil species.GENETICA,122(3),269-276. |
| MLA | He, ZC,et al."Cytogenetic studies on Metasequoia glyptostroboides, a living fossil species".GENETICA 122.3(2004):269-276. |
入库方式： OAI收割
来源：武汉植物园
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。