MOTHER OF FT AND TFL1 Regulates Seed Germination Through a Negative Feedback Loop Modulating ABA Signaling in Arabidopsis

Overview

Journal Plant Cell

Publisher Oxford University Press

Specialties Biology
Cell Biology

Date 2010 Jun 17

PMID 20551347

Citations 162

Authors

Wanyan Xi

Chang Liu

Xingliang Hou

Hao Yu

Affiliations

Soon will be listed here.

Abstract

Abscisic acid (ABA) and gibberellin (GA) are two antagonistic phytohormones that regulate seed germination in response to biotic and abiotic environmental stresses. We demonstrate here that MOTHER OF FT AND TFL1 (MFT), which encodes a phosphatidylethanolamine-binding protein, regulates seed germination via the ABA and GA signaling pathways in Arabidopsis thaliana. MFT is specifically induced in the radical-hypocotyl transition zone of the embryo in response to ABA, and mft loss-of-function mutants show hypersensitivity to ABA in seed germination. In germinating seeds, MFT expression is directly regulated by ABA-INSENSITIVE3 (ABI3) and ABI5, two key transcription factors in ABA signaling pathway. 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. We conclude that during seed germination, MFT promotes embryo growth by constituting a negative feedback loop in the ABA signaling pathway.

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