| Budget Amount *help |
¥44,720,000 (Direct Cost: ¥34,400,000、Indirect Cost: ¥10,320,000)
Fiscal Year 2020: ¥7,670,000 (Direct Cost: ¥5,900,000、Indirect Cost: ¥1,770,000)
Fiscal Year 2019: ¥8,580,000 (Direct Cost: ¥6,600,000、Indirect Cost: ¥1,980,000)
Fiscal Year 2018: ¥28,470,000 (Direct Cost: ¥21,900,000、Indirect Cost: ¥6,570,000)
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| Outline of Final Research Achievements |
Here, we first examined flowering time under four distinct conditions: short-day or long-day and high or low temperature, using various rice lines. We also examined gene expression patterns of key flowering-time genes using the same lines under various conditions including temporal dynamics after light pulses. In addition to delayed flowering because of low growth rates, we found that photoperiodic flowering is clearly enhanced by both Hd1 and Ghd7 genes under low-temperature conditions in rice. We also revealed that PhyB can post-transcriptionally control Ghd7 repressor activity as a temperature sensor to inhibit Ehd1, Hd3a, and RFT1 at lower temperatures, despite inductive photoperiod conditions.The rising of ambient temperatures in early summer would contribute to inhibition of Ghd7 repressor activity, resulting in the appropriate floral induction of rice in temperate climates.
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