2005 Fiscal Year Final Research Report Summary
Study on mechanism of obtaining genetic diversity in agaposermous plants
| Project/Area Number |
15370036
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Biodiversity/Systematics
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| Research Institution | The University of Tokyo |
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Principal Investigator |
ITO Motomi The University of Tokyo, Graduate School of Arts and Sciences, Associate Professor, 大学院・総合文化研究科, 助教授 (00193524)
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| Co-Investigator(Kenkyū-buntansha) |
AOKI Seishiro The University of Tokyo, Graduate School of Arts and Sciences, Asistant Professor, 大学院・総合文化研究科, 助手 (10334301)
KITA Yoko The University of Tokyo, Graduate School of Sciences, Asistant Professor, 大学院・理学研究科, 助手 (60345262)
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| Project Period (FY) |
2003 – 2005
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| Keywords | Taraxacum / Ixeris / agamospermy / agamospermous species |
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| Research Abstract |
Agamospermy is a reproductive system that produces a new descendant individual without fertilization of the gametes. In plants, agamospermy is often found in addition to vegetative reproduction. In agamospermy, neither the diversification nor the genetic changes take place because they are the same clone to their mother plant. Thus, it was said as the blind alley of evolution. However, large amount of the genetic variation are often found in agamospermous plant population. The purpose of this study is to clarify the mechanism that agamospermous species acquires genetic diversity by using two genera of Asteraceae, Taraxacum (hybridization between the Japan diploid dandelions and T.officinale) and Ixeris (Ixeris dentata complex). In this study, agamospermous and sexual population was analyzed in chromosome number, the genetic variation were examined for the purpose of clarification of mechanisms to obtain genetic diversity in agamospermous species.
In the populations of Taraxacum and Ixer
… More
is, the genetic analyses of wild populations, crossing experiments, ecological and physiological characteristics in diploid sexual species, and triploid and tetraploid agamospermous species. In both genera, genetic variation was observed in the wild population examined. Especially in the Ixeris, most individuals in the population were found to be having different genotype one another, and it was concordant with previous studies. To clarify a mechanism to produce genetic polymorphism, crossing experiments was done between individuals of triploid asexual species and diploid sexual species, diploid sexual species and presumed hybrids, and the individuals of triploid asexual species in both genera. As a result, hybrids were obtained in every combination examined. The seeds obtained by crossing experiment were analyzed further, for DNA content with a flow cytometer were done in Taraxacum. As a result, the evidence that the F1 hybrids had been crossing with the diploids or the other hybrid individual was obtained. Less
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[Journal Article] Nuclear DNA, chloroplast DNA, and ploidy analysis clarified biological complexity of the Vandenboschia radicans complex (Hymenophyllaceae) in Japan and adjacent areas.2005
Author(s)
Ebihara, A., Ishikawa, H., Matsumoto, S., Lin, S.-J., Iwatsuki, K., Takamiya, M., Watano, Y., Ito,M.
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Journal Title
Am. J. Bot. 92
Pages: 97-104
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Nuclear DNA, chloroplast DNA, and ploidy analysis clarified biological complexity of the Vandenboschia radicans complex (Hymenophyllaceae) in Japan and adjacent areas.2005
Author(s)
Ebihara, A., Ishikawa, H., Matsumoto, S., Lin, S.-J., Iwatsuki, K., Takamiya, M., Watano, Y., Ito, M.
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Journal Title
Am.J.Bot. 56(1)
Pages: 97-104
Description
「研究成果報告書概要(欧文)」より
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[Journal Article] Molecular phylogenetic analyses and systematics of the genus Saussurea and related genera (Asteraceae, Cardueae).2004
Author(s)
Kita, Y., Fujikawa, K., Ito, M., Ohba, H., Kato,M.
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Journal Title
Taxon 53(3)
Pages: 679-690
Description
「研究成果報告書概要(和文)」より
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[Journal Article] Molecular phylogenetic analyses and systematics of the genus Saussurea and related genera (Asteraceae, Cardueae).2004
Author(s)
Kita, Y., Fujikawa, K., Ito, M., Ohba, H., Kato, M.
-
Journal Title
Taxon 53(3)
Pages: 679-690
Description
「研究成果報告書概要(欧文)」より
