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Iron assimilation and transcription factor controlled synthesis of riboflavin in plants

Iron assimilation and transcription factor controlled synthesis of riboflavin in plants Iron homeostasis is vital for many cellular processes and requires a precise regulation. Several iron efficient plants respond to iron starvation with the excretion of riboflavin and other flavins. Basic helix–loop–helix transcription factors (TF) are involved in the regulation of many developmental processes, including iron assimilation. Here we describe the isolation and characterisation of two Arabidopsis bHLH TF genes, which are strongly induced under iron starvation. Their heterologous ectopic expression causes constitutive, iron starvation independent excretion of riboflavin. The results show that both bHLH TFs represent an essential component of the regulatory pathway connecting iron deficiency perception and riboflavin excretion and might act as integrators of various stress reactions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Planta Springer Journals

Iron assimilation and transcription factor controlled synthesis of riboflavin in plants

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References (65)

Publisher
Springer Journals
Copyright
Copyright © 2007 by Springer-Verlag
Subject
Life Sciences; Forestry; Ecology; Agriculture; Plant Sciences
ISSN
0032-0935
eISSN
1432-2048
DOI
10.1007/s00425-006-0476-9
pmid
17260143
Publisher site
See Article on Publisher Site

Abstract

Iron homeostasis is vital for many cellular processes and requires a precise regulation. Several iron efficient plants respond to iron starvation with the excretion of riboflavin and other flavins. Basic helix–loop–helix transcription factors (TF) are involved in the regulation of many developmental processes, including iron assimilation. Here we describe the isolation and characterisation of two Arabidopsis bHLH TF genes, which are strongly induced under iron starvation. Their heterologous ectopic expression causes constitutive, iron starvation independent excretion of riboflavin. The results show that both bHLH TFs represent an essential component of the regulatory pathway connecting iron deficiency perception and riboflavin excretion and might act as integrators of various stress reactions.

Journal

PlantaSpringer Journals

Published: Jan 27, 2007

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