Cytogenetic studies on Metasequoia glyptostroboides, a living fossil species

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	Cytogenetic studies on Metasequoia glyptostroboides, a living fossil species
	He, ZC; Li, JQ; Cai, Q; Li, XD; Huang, HW
刊名	GENETICA
	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
出版者	KLUWER ACADEMIC PUBL
WOS记录号	WOS:000224991300007
内容类型	期刊论文
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.