Genetic diversity and mating system of the threatened plant <Emphasis Type="Italic">Kirengeshoma palmata</Emphasis> (Saxifragaceae) in Korea |
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Authors: | Chin-Sung Chang Do Yol Choi Hui Kim Yong-Shik Kim Tae Yoon Park |
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Institution: | (1) Department of Forest Sciences, Seoul National University, Seoul, 151-921, South Korea;(2) Department of Medicinal Plants Resources, Mokpo National University, Muan-gun, 534-729, South Korea;(3) School of Natural Resources, Yeungnam University, Gyeongsan, 712-749, South Korea;(4) Graduate School of Education, Yonsei University, Seoul, 120-749, South Korea |
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Abstract: | The endangered herb Kirengeshoma palmata, from eastern Asia, has had its population severely reduced in number through habitat loss and fragmentation. All of the
individuals within five subgroups at Mt. Baek-un-san, in the southern part of Korea, were genetically surveyed by allozyme
analysis. Genetic diversity levels within subgroups were relatively high, and a consistently high outcrossing rate as well
as a negligible biparental mating rate were confirmed by this study. Several groups of visibly connected ramets were observed
in a clustered distribution which suggested cloning. Absence of mating partner rather than pollinators decreased seed production
in small mating groups. The present genetic structure of the five subgroups was probably the result of local extinction of
intervening populations. Because K. palmata may be a self-incompatible species, populations with few genets face lowered seed set due to mate scarcity. Thus, this type
of population may be at an increased risk of extinction as a result of inbreeding depression, loss of genetic variability,
and reduced sexual reproduction. The small, genetically depauperate subgroups may need an input of seeds or plants from other
populations in China or Japan in order to regenerate, but the possibility of outcrossing depression leads us to recommend
outbreeding among the local subgroups of Mt. Baek-un-san to restore genetic variability. |
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Keywords: | Allozyme Conservation Critically endangered Genetic diversity Kirengeshoma palmata Mating system |
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