Meiosis observation and chromosome configuration analysis of Magnolia denudata

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	Meiosis observation and chromosome configuration analysis of Magnolia denudata
	Li, JQ; He, ZC
刊名	ACTA PHYTOTAXONOMICA SINICA
	2003-07-01
卷号	41 期号:4 页码:362-368
关键词	Magnolia denudata meiosis segmental allohexaploid
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.
WOS研究方向	Plant Sciences
语种	英语
出版者	SCIENCE CHINA PRESS
WOS记录号	WOS:000185183000003
内容类型	期刊论文
源URL	[http://202.127.146.157/handle/2RYDP1HH/1228]
专题	中国科学院武汉植物园
通讯作者	Li, JQ
作者单位	Chinese Acad Sci, Wuhan Bot Garden, Wuhan 430074, Peoples R China
推荐引用方式 GB/T 7714	Li, JQ,He, ZC. Meiosis observation and chromosome configuration analysis of Magnolia denudata[J]. ACTA PHYTOTAXONOMICA SINICA,2003,41(4):362-368.
APA	Li, JQ,&He, ZC.(2003).Meiosis observation and chromosome configuration analysis of Magnolia denudata.ACTA PHYTOTAXONOMICA SINICA,41(4),362-368.
MLA	Li, JQ,et al."Meiosis observation and chromosome configuration analysis of Magnolia denudata".ACTA PHYTOTAXONOMICA SINICA 41.4(2003):362-368.