| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2016: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2015: ¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2014: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2013: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
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| Outline of Final Research Achievements |
The present study was undertaken to establish a worldwide, objective and natural taxonomic system of the oogamous genus Volvox and unveiling the evolution of oogamy, based on the molecular and asexual and sexual spheroid morphology of Volvox species collected in various localities of the world. Our field and laboratory studies in this research project resulted in the reconstruction of four, monophyletic infrageneric taxa of the genus Volvox. We re-discovered of the ancestral Volvox species from Thailand and resolved its phylogenyetic position. We identified a novel colonial volvocine genus, Colemanosphaera, in obligately anisogamous conjugation between male and female motile gametes occurred outside the female colony (external fertilization during anisogamy). Considering the external obligate anisogamy, oogamy evolution may have been preceded by the transition from external to internal fertilization during anisogamy within the volvocine green algae.
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