Effects of landscape and demographic history on genetic variation in <Emphasis Type="Italic">Picea glehnii</Emphasis> at the regional scale |
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Authors: | Susumu Goto Yoshiaki Tsuda Yukihiro Koike Chunlan Lian Yuji Ide |
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Institution: | (1) Experimental Station at Tanashi, Graduate School of Agricultural and Life Sciences, The Tokyo University Forests, The University of Tokyo, Midoricho 1-1-8, Nishitōkyō Tokyo, 188-0002, Japan;(2) Tree Genetics Laboratory, Department of Forest Genetics, Forestry and Forest Products Research Institute (FFPRI), Incorporated Administrative Agency, 1 Matsunosato, Tsukuba Ibaraki, 305-8687, Japan;(3) Graduate School of Agricultural and Life Sciences, University Forest in Hokkaido, The University of Tokyo, Yamabe, Furano Hokkaido, 079-1561, Japan;(4) Asian Natural Environmental Science Center, The University of Tokyo, Midori-cho 1-1-8, Nishitōkyō Tokyo, 188-0002, Japan;(5) Laboratory of Forest Ecosystem Studies, Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan; |
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Abstract: | To evaluate the effects of landscape and demographic history on genetic variation in Picea glehnii at a regional scale we have investigated the genetic diversity and genetic differentiation of P. glehnii populations in the Furano region, central Hokkaido, Japan, using seven simple sequence repeat (SSR) markers. We found significant
correlations between elevation and genetic diversity parameters. The value of A
46] increased and the value of F
IS decreased with increasing elevation, while F
IS values were not significantly different from 0 in any of the populations. Significant recent bottlenecks were detected for
isolated populations at low-elevation sites and for relatively large populations at moderate- and high-elevation sites. Evolutionary
events pre-dating the Holocene should be taken into consideration, as elevational gradients should be with respect to locally
adapted traits such as flowering phenology, However, the palynological data from the Holocene in this region suggest that
the distribution pattern of genetic diversity of P. glehnii detected here may have been influenced by past demographic history related to the elevation shifts in this species’ distribution
associated with climate change during this period. Population differentiation was low, with F
ST and G′ST values of 0.022 and 0.065, respectively. However, genetic boundaries were detected around one swamp population (C13). Therefore,
significant isolation by distance (IBD) was not detected when all populations were considered, but there was significant IBD
when the C13 population was excluded. Information on genetic diversity and genetic differentiation at the regional scale may
be useful for selecting seed sources for afforestation programs for P. glehnii. |
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