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Title: Abscisic Acid and Gibberellin Control Seed Germination Through Negative Feedback Regulation By MOTHER OF FT AND TFL1
Authors: XI WANYAN
Keywords: Arabidopsis, MOTHER OF FT AND TFL1, abscisic acid, gibberellin, seed germination
Issue Date: 21-Jun-2010
Citation: XI WANYAN (2010-06-21). Abscisic Acid and Gibberellin Control Seed Germination Through Negative Feedback Regulation By MOTHER OF FT AND TFL1. ScholarBank@NUS Repository.
Abstract: Seed germination is a critical stage in plant development, as it determines the time point when a plant starts its new life cycle. This process is under combinatorial control by endogenous and environmental cues. Abscisic acid (ABA) and gibberellin (GA) are two critical endogenous factors that integrate signals from biotic and abiotic environmental stresses. ABA and GA play antagonistic roles in the regulation of seed germination, with the former inhibiting while the latter promoting seed germination. In this thesis, we demonstrate that MOTHER OF FT AND TFL1 (MFT), which encodes a phosphatidylethanolamine-binding protein, acts as a novel regulator of seed germination via responding to both ABA and GA signaling pathways in Arabidopsis. MFT is specifically induced in the radicle-hypocotyl transition zone of the embryo in response to ABA and mft loss-of-function mutants show hypersensitivity to ABA in terms of seed germination. Genetic analyses revealed that in germinating seeds, MFT expression is directly regulated by ABA-INSENSITIVE3 (ABI3) and ABI5, two key transcription factors in ABA signaling pathway. On the other hand, MFT is also upregulated by DELLA proteins in the GA signaling pathway. MFT in turn provides negative feedback regulation of ABA signaling by directly repressing ABI5. In summary, we conclude that during seed germination, MFT promotes the embryo growth potential by constituting a negative feedback loop in the ABA signaling pathway.
Appears in Collections:Ph.D Theses (Open)

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