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Geographical distribution, genetic diversity, and reproductive traits of mixed polyploid populations inParasenecio kamtschaticus(Senecioneae; Asteraceae)

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/82866

Title: Geographical distribution, genetic diversity, and reproductive traits of mixed polyploid populations inParasenecio kamtschaticus(Senecioneae; Asteraceae)
Authors: Kudo, Gaku Browse this author →KAKEN DB
Hirao, Akira S. Browse this author →KAKEN DB
Keywords: Allozymes
Bulbil
Diploid
Elevation
Genetic diversity
Tetraploid
Issue Date: Oct-2020
Publisher: Springer
Journal Title: Plant Systematics and Evolution
Volume: 306
Issue: 5
Start Page: 86
Publisher DOI: 10.1007/s00606-020-01714-3
Abstract: In order to clarify the genetic differentiation and reproductive traits of mixed polyploid populations in Parasenecio kamtschaticus complex, geographical distribution, genetic diversity, and reproductive performance were compared among three intraspecific types composed of two cytotypes and two varieties in Japan. Diploid P. kamtschaticus var. kamtschaticus (2x-kamtschaticus) was distributed at the center of the distribution range, tetraploid P. kamtschaticus var. kamtschaticus (4x-kamtschaticus) existed widely throughout the entire range, and tetraploid P. kamtschaticus var. bulbifera (4x-bulbifera), producing bulbils, was restricted to higher elevations. Genetic structure was analyzed using allozyme markers. The genetic diversity of 4x-kamtschaticus was higher than that of 2x-kamtschaticus, with that of 4x-bulbifera being intermediate. Populations of 4x-bulbiferaand 2x-kamtschaticus were genetically discriminable from each other in principle coordinate analysis, and the genetic structure of 4x-kamtschaticus populations largely overlapped with those of the other types. Flower and achene production levels were highest in the 4x-kamtschaticus populations and lowest in the 4x-bulbifera populations. Germination activity of achenes was highest in the 2x-kamtschaticus populations and lowest in the 4x-bulbifera populations. Fruit-set success of 4x-bulbifera decreased with elevation because of a shorter growing season, indicating the importance of vegetative reproduction by bulbils at higher elevations. Unexpectedly, the inbreeding coefficients of the 4x-bulbifera populations were the lowest among the three types. Occasional achene production by outcrossing might maintain the high genetic diversity of the 4x-bulbifera populations. The evolution of polyploidy and subsequent bulbil production might enable P. kamtschaticus to disperse a wider range of environmental conditions.
Rights: This is a post-peer-review, pre-copyedit version of an article published in Plant Systematics and Evolution. The final authenticated version is available online at: http://dx.doi.org/10.1007/s00606-020-01714-3
Type: article (author version)
URI: http://hdl.handle.net/2115/82866
Appears in Collections:環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 工藤 岳

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