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AOBPreview originally published online on May 31, 2005
Annals of Botany 2005 96(2):279-288; doi:10.1093/aob/mci176
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© The Author 2005. Published by Oxford University Press on behalf of the Annals of Botany Company. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Clonal and Fine-scale Genetic Structure in Populations of a Restricted Korean Endemic, Hosta jonesii (Liliaceae) and the Implications for Conservation

MI YOON CHUNG1, YOUNGBAE SUH2, JORDI LÓPEZ-PUJOL3, JOHN D. NASON4 and MYONG GI CHUNG1,*

1 Department of Biology, Gyeongsang National University, Jinju 660-701, Republic of Korea, 2 Natural Products Research Institute, Seoul National University, Seoul 110-460, Republic of Korea, 3 Laboratori de Botànica, Facultat de Farmàcia, Universitat de Barcelona, 08028 Barcelona, Spain and 4 Department of Ecology, Evolution, and Organismal Biology, Iowa State University, Ames, IA 50011, USA

* For correspondence. E-mail mgchung{at}nongae.gsnu.ac.kr

Received: 2 December 2004    Returned for revision: 8 March 2005    Accepted: 25 April 2005    Published electronically: 31 May 2005

• Background and Aims In plant populations the magnitude of spatial genetic structure of apparent individuals (including clonal ramets) can be different from that of sexual individuals (genets). Thus, distinguishing the effects of clonal versus sexual individuals in population genetic analyses could provide important insights for evolutionary biology and conservation. To investigate the effects of clonal spread on the fine-scale spatial genetic structure within plant populations, Hosta jonesii (Liliaceae), an endemic species to Korea, was chosen as a study species.

• Methods Using allozymes as genetic markers, spatial autocorrelation analysis of ramets and of genets was conducted to quantify the spatial scale of clonal spread and genotype distribution in two populations of H. jonesii.

• Key Results Join-count statistics revealed that most clones are significantly aggregated at <3-m interplant distance. Spatial autocorrelation analysis of all individuals resulted in significantly higher Moran's I values at 0–3-m interplant distance than analyses of population samples in which clones were excluded. However, significant fine-scale genetic structure was still observed when clones were excluded.

• Conclusions These results suggest that clones enhance the magnitude of spatial autocorrelation due to localized clonal spread. The significant fine-scale genetic structure detected in samples excluding clones is consistent with the biological and ecological traits exhibited by H. jonesii including bee pollination and limited seed dispersal. For conservation purposes, genetic diversity would be maximized in local populations of H. jonesii by collecting or preserving individuals that are spaced at least 5 m apart.

Key words: Hosta jonesii, allozymes, clonal structure, conservation, fine-scale genetic structure, Korean endemic, Liliaceae, sampling strategies


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J. M. CHUNG, B. C. LEE, J. S. KIM, C.-W. PARK, M. YOON CHUNG, and M. GI CHUNG
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[Abstract] [Full Text] [PDF]


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