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题名: 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
作者: Zhang, Xue-Mei1, 2; Wen, Jun3; Dao, Zhi-Ling1; Motley, Timothy J.4, 5; Long, Chun-Lin1, 5
刊名: JOURNAL OF PLANT RESEARCH
关键词: Breeding system ; Conservation ; Fragmentation ; Magnolia cathcartii ; Gene flow ; Genetic diversity
英文摘要: 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.
出版日期: 2010-05-01
卷号: 123, 期号:3, 页码:321-331
DOI标识: 10.1007/s10265-009-0278-9
语种: 英语
ISSN号: 0918-9440
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/2309
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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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

Recommended Citation:
Zhang, XM; Wen, J; Dao, ZL; Motley, TJ; Long, CL.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,2010,123(3):321-331
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