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The EC integrates photoperiod information in rice. ELF3 activity increases during darkness, enabling the EC to reduce expression of key floral repressors such as PRR37 and Ghd7 in SD conditions. Activation of PhyB under LD conditions enables repression of ELF3-1, resulting in the enhanced expression of the transcriptional regulators that, in concert with Hd1, repress florigen genes Hd3a and RFT, therefore delaying flowering.
