| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2015: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
In seasonal reproduction, day length (photoperiod) is a cue to breed in the specific season for many animals, however, the molecular mechanisms of photoperiodic time measurement have not been clarified. Medaka, a small freshwater teleost, is a long-day breeder. We examined the response to changes of day lengths using various medaka populations collected from all over Japan, and found geographical variations in (1) a critical day length to induce reproduction and (2) response to short-day that induce reproductive quiescence. The present study aimed to identify the genes involved in the photoperiodic time measurement using these geographical variations. We conducted forward genetic approaches, and detected chromosomal regions involved in the response to day length.
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