Genetic Structure and Conservation Considerations of Rare Endemic Abeliophyllum distichum Nakai (Oleaceae) in Korea |
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Authors: | Utchang Kang Chin-Sung Chang Yong Shik Kim |
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Institution: | (1) Department of Forest Resources and The Arboretum, Seoul National University, Suwon, 441–744 Korea, KR;(2) Department of Landscape Architecture, Yeungnam University, Kyongsan, 712–749 Korea, KR |
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Abstract: | Abeliophyllum distichum , was assessed using starch gel electrophoresis. Although A. distichum maintained relatively high genetic diversity probably due to floral heteromorphism and preferred outcrossing, their genetic
variation, where small effective size of population and genetic drift are of utmost importance, was lower than the other outbreeding
plants. The calculated GsT indicated a high level of genetic differentiation among populations, suggesting that gene flow was limited. The dendrogram
based on Nei's genetic distance showed that the Pu-an and the Koe-san populations fell into two distinct groups, which were
consistent with geographic distance and distribution. It was probable that in the populations of A. distichum sexually reproduced individuals rarely become established within the populations. From observations, Lassioglossum bee was found to be the most effective pollinator of A. distichum. Artificial crossing experiment indicated that pollinators contributed considerably to natural population and that pollinator
limitation could potentially reduce fitness of A. distichum in wild populations. The management of rare plant species should include improvement of genetic exchanges among populations
by artificial gene flow. From each of the four subpopulations, fresh twigs from 20 trees should be collected and propagated
as the cutting for ex situ conservation.
Received 30 April 1999/ Accepted in revised form 23 January 2000 |
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Keywords: | : Abeliophyllum distichum Allozyme Conservation Distyly Endemic species Genetic diversity Pollinator |
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