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Author Brambilla V., Martignago D., Goretti D., Cerise M., Somssich M., de Rosa M., Galbiati F., Shrestha R., Lazzaro F., Simon R., Fornara F.
Title Antagonistic Transcription Factor Complexes Modulate the Floral Transition in Rice.
Abstract:
Plants measure day or night lengths to coordinate specific developmental changes with a favorable season. In rice (Oryza sativa), the reproductive phase is initiated by exposure to short days when expression of HEADING DATE 3a (Hd3a) and RICE FLOWERING LOCUS T 1 (RFT1) is induced in leaves. The cognate proteins are components of the florigenic signal and move systemically through the phloem to reach the shoot apical meristem (SAM). In the SAM, they form a transcriptional activation complex with the bZIP transcription factor OsFD1 to start panicle development. Here, we show that Hd3a and RFT1 can form transcriptional activation or repression complexes also in leaves and feed back to regulate their own transcription. Activation complexes depend on OsFD1 to promote flowering. However, additional bZIPs, including Hd3a BINDING REPRESSOR FACTOR1 (HBF1) and HBF2, form repressor complexes that reduce Hd3a and RFT1 expression to delay flowering. We propose that Hd3a and RFT1 are also active locally in leaves to fine-tune photoperiodic flowering responses.
Journal Plant Cell
Country Italy
Volume 29(11)
Pages 2801-2816
Year 2017
PubMed ID 29042404
PubMed Central ID 5728136
DOI 10.1105/tpc.17.00645
URL -
Relation
Gene BZIP24 BZIP42 BZIP62 BZIP77 BZIP9 EF1 GF14C HD3A RAP1A RAP1B RFT1
INSD -
Strain Wild Core Collection -
Sterile Seed Strain -
Lethal Embryo
Mutantion Strain
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Stages in Each Organ
- Muant Lines (Gene)
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Cultivated Varieties(NIG Collection) -
Stages in Each Organ -
/rice/oryzabase