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The NF-YC-RGL2 module integrates GA and ABA signalling to regulate seed germination in Arabidopsis.

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.

SUBMITTER: Liu X

PROVIDER: S-EPMC5027291 | biostudies-literature | 2016 Sep

REPOSITORIES: biostudies-literature

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The NF-YC-RGL2 module integrates GA and ABA signalling to regulate seed germination in Arabidopsis.

Liu Xu X Hu Pengwei P Huang Mingkun M Tang Yang Y Li Yuge Y Li Ling L Hou Xingliang X

Nature communications 20160914

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 t ...[more]

PMID: 27624486

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