Genetic effects of different mating modes in Sinocalycanthus chinensis (Cheng et S.Y. Chang) Cheng et S.Y. Chang,an endangered species endemic to Zhejiang Province,China |
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| Institution: | 1. Department of Ornamental Horticulture, School of Landscape Architecture, Zhejiang Agriculture and Forestry University, 311300 Lin''an, Hangzhou, China;2. Nurturing Station for State Key Laboratory of Subtropical Silviculture, 311300 Lin''an, Hangzhou, China;1. Key Laboratory of Chemistry in Ethnic Medicinal Resources, State Ethnic Affairs Commission & Ministry of Education, Yunnan University of Nationalities, Kunming, Yunnan 650031, PR China;2. Kunming Xianghao Technology Co., Ltd., Kunming, Yunnan 650204, PR China;3. Department of Plant Resources Utilization, School of Forestry, Southwest Forestry University, Kunming, Yunnan 650224, PR China;1. College of Grassland Science, Key Laboratory of Grassland Ecosystem (Ministry of Education), Pratacultural Engineering Laboratory of Gansu Province, Sino-U. S. Centers for Grazing Land Ecosystem Sustainability, Gansu Agricultural University, Lanzhou 730070, PR China;2. Gansu Agricultural University-Massey University Research Centre for Grassland Biodiversity, Gansu Agricultural University, Lanzhou 730070, PR China;3. Institute of Natural and Mathematical Sciences, Massey University, Private Bag 102 904 North Shore Mail Centre 0632, Auckland, New Zealand;4. Ecological Genetics Laboratory, Landcare Research, Private Bag 92170, Auckland, New Zealand;5. Institute for Applied Ecology, University of Canberra, Bruce ACT 2601, Australia;1. Institute of Applied Physics, TU Wien, 1040 Vienna, Austria;2. CEITEC BUT, Brno University of Technology, Purkyňova 123, 612 00 Brno, Czech Republic;3. Institute of Physical Engineering, Brno University of Technology, Technická 2, 616 69 Brno, Czech Republic |
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| Abstract: | The tertiary relict plant Sinocalycanthus chinensis, endemic to Zhejiang province with small populations and fragmented distribution, is an endangered plant in China. A relatively high species-level genetic diversity and low population-level genetic diversity exist in this species, and large genetic differentiation exists between two main populations with significant geographical isolation. Based on a previous artificial simulation mating test, amplified fragment length polymorphism (AFLP) marker was used in the present study to assess genetic diversity of filial generation colonies generated by different mating modes and to clarify genetic effects of various mating modes. The filial generation colonies generated by natural pollination and by geitonogamy were found to be similar to each other in terms of their relatively low genetic parameters and minimum genetic differentiation. This indicated that under natural conditions, selfing might occur at a higher proportion leading to the low genetic diversity within the population. The degree of genetic diversity of the filial generation colonies generated by outbreeding was highest, followed by inbreeding (xenogamy) and selfing (geitonogamy). Moreover, genetic differentiation between filial generation colonies generated by selfing (geitonogamy) and inbreeding (i.e., xenogamy) was much smaller than that between filial generation colonies generated by selfing and outbreeding. The results indicated that the genetic effect of outbreeding was much more dominant than other mating modes. Therefore, artificially promoting outbreeding between the two isolated geographically populations contributed to the enhancement of genetic diversity in populations in S. chinensis. |
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| Keywords: | Genetic effect Mating system Outbreeding Genetic diversity |
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