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Abstract Detail


Park, Chong-Wook [1], Bhandari, Gauri Shankar [1], Park, Jin Hee [2], Kim, Hye Min [1].

The origin and evolution of Fallopia sachalinensis (F. Schmidt) Ronse Decr. (Polygonaceae)in Ullung Island inferred from eight chloroplast regions.

Fallopia sachalinensis belongs to sect. Reynoutria (Houtt.) Ronse Decr., and occurs naturally from Sakhalin Island of Russia to central Japan. In Korea, it is confined to Ullung Island and Dok Island, small volcanic islands about 135 km and 217 km from the east coast, respectively. Fallopia sachalinensis is readily distinguished from the other species in the section by its robust stems and conspicuously large ovate leaves with moderately to deeply cordate bases. In this study, we examined chloroplast matK, ndhF, rbcL, rbcL-accD IGS, accD, accD-psaI IGS, trnL intron, and trnL-trnF IGS sequences from F. sachalinensis and closely related taxa in Korea, Japan, the Russian Far East, the United Kingdom, and the United States to assess the degree of molecular divergence of the Ullung and Dok Island populations of F. sachalinensis and to elucidate their origin and relationships to those in other regions. All Korean populations of F. sachalinensis examined in this study had a chromosome number of 2n = 132 (dodecaploid), confirming our previous counts. In contrast, the individuals of F. sachalinensis collected from Japan and Russia were tetraploid with 2n = 44. MP and BI analyses of molecular data strongly suggest that the populations of F. sachalinensis in Ullung Island and Dok Island are diverged from those in the other areas including Sakhalin Island and Japan. In both MP and BI trees, accessions from these islands form a highly supported monophyletic group, suggesting that they probably originated from a single introduction. Our data are also congruent with previous reports that the F. sachalinensis population in Dok Island was introduced from Ullung Island, as it has the same chromosome number (2n = 132) and haplotype found in Ullung Island populations. Based on our data, it is likely that the progenitor of the Ullung Island/Dok Island populations was introduced to Ullung Island from Japan, and had captured a F. japonica var. japonica cpDNA prior to its introduction to the island in Japan, where F. sachalinensis is partly sympatric with F. japonica var. japonica. Genetic differentiation of the Ullung Island populations probably arose through mutations and polyploidization after the introduction, since the haplotypes found in these populations are not detected in any possible source areas. The haplotype data also indicate that plants of F. sachalinensis were introduced to Europe and North America from northeastern Asia, presumably from northern Japan and/or the far eastern region of Russia including Sakhalin Island.

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1 - Seoul National University, School of Biological Sciences, Seoul, 08826, Korea
2 - Nakdonggang National Istitute of Biological Resources, Sangju, 37242, Korea

Fallopia sachalinensis
sect. Reynoutria
Ullung Island population
cpDNA haplotype.

Presentation Type: Poster
Session: P, Systematics Section/ASPT Posters
Location: Exhibit Hall/Savannah International Trade and Convention Center
Date: Monday, August 1st, 2016
Time: 5:30 PM This poster will be presented at 5:30 pm. The Poster Session runs from 5:30 pm to 7:00 pm. Posters with odd poster numbers are presented at 5:30 pm, and posters with even poster numbers are presented at 6:15 pm.
Number: PSY023
Abstract ID:889
Candidate for Awards:None

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