Spatial pattern of chloroplast DNA variation of Cyclobalanopsis glauca in Taiwan and East Asia

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题名:	Spatial pattern of chloroplast DNA variation of Cyclobalanopsis glauca in Taiwan and East Asia
作者:	黃士穎
贡献者:	生科所
关键词:	differentiation haplotype migration mutation subtropical tree
日期:	2002-11
上传时间:	2011-01-17 10:11:42 (UTC+8)
摘要:	Abstract This study examined the spatial pattern of chloroplast DNA (cpDNA) variation in Cyclobalanopsis glauca (Thunb. ex Murray) Oerst. (Fagaceae) in 140 trees from Taiwan (25 populations), Japan (three), Ryukyus (two), Hong Kong (one) and Mainland China (one). By sequencing three cpDNA intergenic spacer fragments using universal primers (trn T-trn L, trn V-trn M, including the trn V intron, and pet G-trn P), we found a total of 1980 bp and 15 polymorphic sites. Among them, 12 sites were caused by point mutation, and three resulted from insertion. This gives rise to a total of 13 cpDNA haplotypes. The level of differentiation among the populations studied is relatively high (G <sub>ST</sub> = 0.612). Two ancestral haplotypes (A and B) are distributed widely in East Asia. Interestingly, all the derived cpDNA variations are found only in Taiwan but not in other areas. The Central Mountain Ridge (CMR) of Taiwan creates an unsurpassed barrier to the east–west gene flow of C. glauca . Among the populations on the west of CMR, only three separated populations, Yangmingshan, Wushe and Chinshuiying, have high haplotype diversity, each consisting of sister haplotypes all mutated from the same ancestral haplotype. Thus, they have probably originated from de novo mutation after the last glaciation. This inference agrees with the observation that no spatial autocorrelation existed on the west side. Two unrelated dominant lineages on the east of the CMR (haplotypes D and F) showed significant spatial genetic structure. Estimate of N <sub>ST</sub> – G <sub>ST</sub> was –0.090 and differed significantly from zero. Thus at the local scale, the phylogeographical component of the genetic structure is significant on the east of the CMR. Accompanied by published palynological records of the last glaciation, this study suggests the possibility that these two types were colonized northward from the southeastern part of Taiwan. ‘Star-like’... [ABSTRACT FROM AUTHOR]. Copyright of Molecular Ecology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
關聯:	Molecular Ecology Vol. 11 P.2349-2358
显示于类别:	[生物科技研究所 ] 期刊論文

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