| RRC ID |
57597
|
| 著者 |
Tamaki I, Kawashima N, Setsuko S, Lee JH, Itaya A, Yukitoshi K, Tomaru N.
|
| タイトル |
Population genetic structure and demography of Magnolia kobus: variety borealis is not supported genetically.
|
| ジャーナル |
J Plant Res
|
| Abstract |
Species delimitations by morphological and by genetic markers are not always congruent. Magnolia kobus consists of two morphologically different varieties, kobus and borealis. The latter variety is characterized by larger leaves than the former. For the conservation of M. kobus genetic resources in natural forests, the relationships between morphological and genetic variation should be clarified. We investigated variations in nuclear microsatellites, chloroplast DNA (cpDNA) sequences and leaf morphological traits in 23 populations of M. kobus over the range of species. Two genetically divergent lineages, northern and southern were detected and their geographical boundary was estimated to be at 39°N. The northern lineage consisted of two genetic clusters and a single cpDNA haplotype, while the southern one had multiple genetic clusters and cpDNA haplotypes. The northern lineage showed significantly lower genetic diversity than the southern. Approximate Bayesian computation indicated that the northern and southern lineages had experienced, respectively, population expansion and long-term stable population size. The divergence time between the two lineages was estimated to be 565,000 years ago and no signature of migration between the two lineages after divergence was detected. Ecological niche modeling showed that the potential distribution area in northern Japan at the last glacial maximum was very small. It is thus considered that the two lineages have experienced different population histories over several glacial-inter-glacial cycles. Individuals of populations in the central to northern part of Honshu on the Sea of Japan side and in Hokkaido had large leaf width and area. These leaf characteristics corresponded with those of variety borealis. However, the delimitation of the northern and southern lineages detected by genetic markers (39°N) was not congruent with that detected by leaf morphologies (36°N). It is therefore suggested that variety borealis is not supported genetically and the northern and southern lineages should be considered separately when identifying conservation units based not on morphology but on genetic markers.
|
| 巻・号 |
132(6)
|
| ページ |
741-758
|
| 公開日 |
2019-9-5
|
| DOI |
10.1007/s10265-019-01134-6
|
| PII |
10.1007/s10265-019-01134-6
|
| PMID |
31489497
|
| PMC |
PMC7196954
|
| MeSH |
Biological Evolution
DNA, Chloroplast / analysis
Ecosystem
Genetic Variation*
Magnolia / anatomy & histology
Magnolia / classification
Magnolia / genetics*
Microsatellite Repeats
Phylogeny
Phylogeography
Plant Dispersal
Plant Leaves / anatomy & histology
|
| IF |
2.0
|
| 引用数 |
3
|
| リソース情報 |
| GBIF |
Plant Specimen Database of Tama Forest Science Garden, Forestry and Forest Products Research Institute, Japan
Vascular plant specimens of Akita Prefectural Museum
Herbarium, University Archives and Collections, Fukushima University, Japan (FKSE)
Vascular plant specimens of Iida City Museum
Plant specimens of Oiso Municipal Museum
Plant Specimens of Kurashiki Museum of Natural History
Herbarium Specimens of Tokushima Prefectural Museum, Japan
Herbarium of Kitakyushu Museum of Natural History and Human History
Spermatophyta specimens of Iwate Prefectural Museum
Plant specimens deposited in Osaka Museum of Natural History, Japan
Vascular Plant Specimens of Kochi Prefectural Makino Botanical Garden
Gunma Museum of Natural History, Vascular Plant Specimen
Monitoring records of plant species in the Hakone region of Fuji-Hakone-Izu National Park, Japan, 2001-2010 |
