Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas

doi:10.1007/s10265-009-0278-9

	Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas
	Zhang, Xue-Mei1,2 ; Wen, Jun 3; Dao, Zhi-Ling 1; Motley, Timothy J.4,5; Long, Chun-Lin 1,5
通讯作者	long@mail.kib.ac.cn
	2010-05-01
发表期刊	JOURNAL OF PLANT RESEARCH
ISSN	0918-9440
卷号	123 期号:3 页码:321-331
摘要	Nine natural populations of the rare evergreen tree Magnolia cathcartii (Magnoliaceae) were sampled across its natural range, and amplified fragment length polymorphism (AFLP) markers were used to assess genetic variation within and among populations. Three ex situ populations were also surveyed to determine whether conservation plantings include the entire genetic diversity of the species. Genetic diversity within the natural populations was very low (0.122 for Nei's gene diversity), and the southeast populations had the highest diversity. The ex situ populations had a lower diversity than the mean diversity for all populations, and none of the ex situ populations reached the levels of diversity found in their source populations. Genetic differentiation was high among natural populations (G (st) = 0.247), and an isolation-by-distance pattern was detected. Habitat fragmentation, restricted gene flow, and geitonogamy are proposed to be the primary reasons for the low genetic diversity and high genetic differentiation. More protection is needed, especially for the southeast populations, which possess the highest numbers of unique alleles according to AFLP fragment analyses. The ex situ program was a good first step towards preserving this species, but the current ex situ populations preserve only a limited portion of its genetic diversity. Future ex situ efforts should focus on enhancing the plantings with individuals from southeastern Yunnan.
关键词	Breeding System Conservation Fragmentation Magnolia Cathcartii Gene Flow Genetic Diversity
学科领域	Plant Sciences
DOI	10.1007/s10265-009-0278-9
收录类别	SCI
语种	英语
WOS记录号	WOS:000277025000009
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/2309
专题	资源植物与生物技术所级重点实验室
作者单位	1.Chinese Acad Sci, Kunming Inst Bot, Kunming 650204, Yunnan, Peoples R China 2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China 3.Smithsonian Inst, Natl Museum Amer Hist, Dept Bot, Washington, DC 20013 USA 4.Old Dominion Univ, Dept Biol Sci, Norfolk, VA 23529 USA 5.Cent Univ Nationalities, Coll Life & Environm Sci, Beijing 100081, Peoples R China
推荐引用方式 GB/T 7714	Zhang, Xue-Mei,Wen, Jun,Dao, Zhi-Ling,et al. Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas[J]. JOURNAL OF PLANT RESEARCH,2010,123(3):321-331.
APA	Zhang, Xue-Mei,Wen, Jun,Dao, Zhi-Ling,Motley, Timothy J.,&Long, Chun-Lin.(2010).Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas.JOURNAL OF PLANT RESEARCH,123(3),321-331.
MLA	Zhang, Xue-Mei,et al."Genetic variation and conservation assessment of Chinese populations of Magnolia cathcartii (Magnoliaceae), a rare evergreen tree from the South-Central China hotspot in the Eastern Himalayas".JOURNAL OF PLANT RESEARCH 123.3(2010):321-331.

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