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ABA-dependent control of GIGANTEA signalling enables drought escape via up-regulation of FLOWERING LOCUS T in Arabidopsis thaliana

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dc.contributor.authorRiboni, M.
dc.contributor.authorTest, A.
dc.contributor.authorGalbiati, M.
dc.contributor.authorTonelli, C.
dc.contributor.authorConti, L.
dc.date.issued2016
dc.description.abstractOne strategy deployed by plants to endure water scarcity is to accelerate the transition to flowering adaptively via the drought escape (DE) response. In Arabidopsis thaliana, activation of the DE response requires the photoperiodic response gene GIGANTEA (GI) and the florigen genes FLOWERING LOCUS T (FT) and TWIN SISTER OF FT (TSF). The phytohormone abscisic acid (ABA) is also required for the DE response, by promoting the transcriptional up-regulation of the florigen genes. The mode of interaction between ABA and the photoperiodic genes remains obscure. In this work we use a genetic approach to demonstrate that ABA modulates GI signalling and consequently its ability to activate the florigen genes. We also reveal that the ABA-dependent activation of FT, but not TSF, requires CONSTANS (CO) and that impairing ABA signalling dramatically reduces the expression of florigen genes with little effect on the CO transcript profile. ABA signalling thus has an impact on the core genes of photoperiodic signalling GI and CO by modulating their downstream function and/or activities rather than their transcript accumulation. In addition, we show that as well as promoting flowering, ABA simultaneously represses flowering, independent of the florigen genes. Genetic analysis indicates that the target of the repressive function of ABA is the flowering-promoting gene SUPPRESSOR OF OVEREXPRESSION OF CONSTANS1 (SOC1), a transcription factor integrating floral cues in the shoot meristem. Our study suggests that variations in ABA signalling provide different developmental information that allows plants to co-ordinate the onset of the reproductive phase according to the available water resources.
dc.description.statementofresponsibilityMatteo Riboni, Alice Robustelli Test, Massimo Galbiati, Chiara Tonelli, Lucio Conti
dc.identifier.citationJournal of Experimental Botany, 2016; 67(22):6309-6322
dc.identifier.doi10.1093/jxb/erw384
dc.identifier.issn0022-0957
dc.identifier.issn1460-2431
dc.identifier.orcidRiboni, M. [0000-0001-8864-9696]
dc.identifier.urihttp://hdl.handle.net/2440/114194
dc.language.isoen
dc.publisherOxford University Press
dc.rights© The Author 2016. Published by Oxford University Press on behalf of the Society for Experimental Biology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
dc.source.urihttps://doi.org/10.1093/jxb/erw384
dc.subjectAbscisic acid (ABA); adaptation; drought stress; florigen expression; flowering; photoperiod
dc.titleABA-dependent control of GIGANTEA signalling enables drought escape via up-regulation of FLOWERING LOCUS T in Arabidopsis thaliana
dc.typeJournal article
pubs.publication-statusPublished

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