| Project/Area Number |
10836005
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
自然史科学
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| Research Institution | CHIBA UNIVERSITY |
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Principal Investigator |
KURITA Siro Dept. Biology, Fac. of Science, Chiba University, Professor, 理学部, 教授 (20009385)
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| Co-Investigator(Kenkyū-buntansha) |
ASAKAWA Takeshi Dept. Biology, Fac. of Science, Chiba University, Assistant Professor, 理学部, 助手 (50213682)
ITO Motomi Dept. Systems Sciences, 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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| Project Period (FY) |
1998 – 2000
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| Project Status |
Completed (Fiscal Year 2000)
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| Budget Amount *help |
¥3,800,000 (Direct Cost: ¥3,800,000)
Fiscal Year 2000: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1999: ¥1,100,000 (Direct Cost: ¥1,100,000)
Fiscal Year 1998: ¥2,100,000 (Direct Cost: ¥2,100,000)
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| Keywords | Lycoris / speciation / karyotype evolution / B-chromosome / matK / 分子系統学 / 染色体 / rDNA / 雑種形成 / 分子系続学 / ITS |
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| Research Abstract |
Genus Lycoris distributes in East Asia and comprises of about 23 species. This genus has a big and beautiful flower, and thus, is an important ornamental plant. Many cultivation varieties had been made by crossing among wild species. In addition to diploid plants producing seeds, some 'species' has an agamosporous reproductive system, most of which are triploids, or progenitors of hybrid between species. We have studied this genus to elucidate mode of speciation in plants.
For a purpose to clarify origin and evolution of Lycoris, we investigated DNA sequences of chloroplast matK genes, and reconstructed the phylogenetic trees. These trees suggested that genus Lycoris is monophyletic together with other East Asian genera of Amaryllidaceae, and that phylogeny of the species in Lycoris is correlated neither with their karyotype, nor with their morphological and physiological characteristics.
We also investigated chromosomes of this genus using FISH methods. The result suggested that their B-chromosome could be derived from RNA gene clusters, and that Robertsonian change in karyotype would be postulated.
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