| Budget Amount *help |
¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2013: ¥390,000 (Direct Cost: ¥300,000、Indirect Cost: ¥90,000)
Fiscal Year 2012: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2011: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
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| Research Abstract |
We reconstructed molecular phylogenetic trees of several strains of symbiotic chlorella harbored in the endodermal epithelial cells of viridissima group hydra strains and investigated their congruence with the molecular phylogenetic trees of the host hydra strains. We also confirmed the vertical transition of the symbiotic chlorella through the both reproduction process, asexual budding and the oogenesis in the sexual reproduction. Based on the results, we proposed following hypothesis; Symbiosis with chlorella occurred once in ancestral viridissima group Hydra species, and once established, symbiosis has been conservative in nature and has continued over a long term with occasional cospeciation. We also suspected that the symbiosis between hydra and chlorella have its origin in the age before the breakup of Pangaea.
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