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Figure 7


Fig. 7. A model for photoperiodic flowering in rice. In wild-type plants, Hd3a promotes transition to the reproductive stage and induces the expression of OsMADS14 and OsMADS15, and flowers about 60 DAS under SD conditions. However, in Hd3a RNAi plants, RFT1 expression starts to increase during later stages, and induces OsMADS14 and OsMADS15 expression under SD conditions. When RFT1 expression is activated, H3K9 acetylation levels are high at the 5'UTR of RFT1. Double RFT1-Hd3a RNAi plants did not flower up to 300 DAS under SD conditions, suggesting that RFT1 and Hd3a are the key regulators of photoperiodic flowering under SD conditions.





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