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  • Title: The NF-YC-RGL2 module integrates GA and ABA signalling to regulate seed germination in Arabidopsis.
    Author: Liu X, Hu P, Huang M, Tang Y, Li Y, Li L, Hou X.
    Journal: Nat Commun; 2016 Sep 14; 7():12768. PubMed ID: 27624486.
    Abstract:
    The antagonistic crosstalk between gibberellic acid (GA) and abscisic acid (ABA) plays a pivotal role in the modulation of seed germination. However, the molecular mechanism of such phytohormone interaction remains largely elusive. Here we show that three Arabidopsis NUCLEAR FACTOR-Y C (NF-YC) homologues NF-YC3, NF-YC4 and NF-YC9 redundantly modulate GA- and ABA-mediated seed germination. These NF-YCs interact with the DELLA protein RGL2, a key repressor of GA signalling. The NF-YC-RGL2 module targets ABI5, a gene encoding a core component of ABA signalling, via specific CCAAT elements and collectively regulates a set of GA- and ABA-responsive genes, thus controlling germination. These results suggest that the NF-YC-RGL2-ABI5 module integrates GA and ABA signalling pathways during seed germination.
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