Mating system and genetic diversity of a rare desert legume Ammopiptanthus nanus (Leguminosae) |
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作者姓名: | 陈国庆 黄宏文 Daniel J CRAWFORD 潘伯荣 葛学军 |
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作者单位: | 1. 中国科学院华南植物园 广州;2. 美国堪萨斯大学生态与进化生物学系和美国国家自然历史博物馆生物多样性研究中心 劳伦斯;3. 中国科学院新疆生态与地理研究所; |
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基金项目: | Acknowledgements This work was financially supported by the National Natural Science Foundation of China (Grant No. 30370282), Educational Commission of Hubei Province of China (Q20082201), and Talent Introduction Funds of Hubei Normal University (2007F13). We thank Dr. Ming KANG, Yi-Fei LIU and Yan-Qin XU for their technical assistance. |
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摘 要: | Ammopiptanthus nanus is an endangered evergreen shrub endemic to the deserts of central Asia and plays an important role in delaying further desertification. We examined allozyme variation and AFLP diversity in A. nanus populations and investigated the mating system of this species using progeny arrays assayed for polymorphic allozyme loci. Mating system analysis in the Keyi'eryongke'er population showed low levels of outcrossing, and strong inbreeding depression. Low levels of genetic variation were detected at both population (allozyme, Pp=14.0%, A=l.14, He=0.031; AFLP, Pp=14.5%, Shannon's information index I=0.063) and species (allozyme, Pp=21.1%, A=1.21, He=0.040; AFLP, Pp=20.9%, I=0.083) levels; while moderate genetic differentiation existed among populations, as indicated by allozymes (Gsa-=0.081) and AFLP (GST=0.151-0.193). Founder effect, bottlenecks in evolutionary history, the mixed mating system and co-ancestry may have influenced the level of genetic diversity in A. nanus. Markers of both types provide new insights for conservation management, indicating that the Biao'ertuokuoyi and Keyi'eryongke'er populations should be given priority for in situ conservation and regarded as seed sources for ex situ conservation.
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关 键 词: | 豆科 AFLT 等位基因酶 植物繁殖 植物生理学 |
收稿时间: | 2008-06-23 |
修稿时间: | 2008-10-08 |
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