A membrane-associated NAC transcription factor regulates salt-responsive flowering via FLOWERING LOCUS T in Arabidopsis

A membrane-associated NAC transcription factor regulates salt-responsive flowering via FLOWERING... The plant-specific NAC (NAM, ATAF1/2, CUC2) transcription factors play regulatory roles in diverse developmental processes and stress responses. Notably, a subset of the NAC members, collectively designated NTLs, is membrane-associated, suggesting that membrane-mediated regulation would be an important molecular scheme functioning in rapid transcriptional responses to external stimuli. Here, we examined the physiological role of a salt-responsive NTL, NTL8, by molecular genetic and transgenic approaches. NTL8 is expressed as a membrane-associated, dormant form and subsequently processed into a transcriptionally active, nuclear form. Transgenic plants overproducing an active NTL8 form exhibited delayed flowering as well as reduced growth with small curled leaves. Accordingly, expression of FLOWERING LOCUS T (FT) and its downstream genes was significantly reduced in the transgenic plants. Furthermore, FT was significantly repressed by high salt. We therefore propose that NTL8 mediates salt-responsive flowering via FT in Arabidopsis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Planta Springer Journals

A membrane-associated NAC transcription factor regulates salt-responsive flowering via FLOWERING LOCUS T in Arabidopsis

Planta, Volume 226 (3) – Apr 5, 2007

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Publisher
Springer Journals
Copyright
Copyright © 2007 by Springer-Verlag
Subject
Life Sciences; Forestry; Ecology; Agriculture; Plant Sciences
ISSN
0032-0935
eISSN
1432-2048
D.O.I.
10.1007/s00425-007-0513-3
Publisher site
See Article on Publisher Site

Abstract

The plant-specific NAC (NAM, ATAF1/2, CUC2) transcription factors play regulatory roles in diverse developmental processes and stress responses. Notably, a subset of the NAC members, collectively designated NTLs, is membrane-associated, suggesting that membrane-mediated regulation would be an important molecular scheme functioning in rapid transcriptional responses to external stimuli. Here, we examined the physiological role of a salt-responsive NTL, NTL8, by molecular genetic and transgenic approaches. NTL8 is expressed as a membrane-associated, dormant form and subsequently processed into a transcriptionally active, nuclear form. Transgenic plants overproducing an active NTL8 form exhibited delayed flowering as well as reduced growth with small curled leaves. Accordingly, expression of FLOWERING LOCUS T (FT) and its downstream genes was significantly reduced in the transgenic plants. Furthermore, FT was significantly repressed by high salt. We therefore propose that NTL8 mediates salt-responsive flowering via FT in Arabidopsis.

Journal

PlantaSpringer Journals

Published: Apr 5, 2007

References

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