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...

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Bibliographic Details
Published in:Planta 2007-06, Vol.226 (1), p.147-158
Main Authors: Vorwieger, A, Gryczka, C, Czihal, A, Douchkov, D, Tiedemann, J, Mock, H.-P, Jakoby, M, Weisshaar, B, Saalbach, I, Bäumlein, H
Format: Article
Language:English
Subjects:
Arabidopsis
Arabidopsis - genetics
Arabidopsis - metabolism
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
Basic helix-loop-helix
Basic Helix-Loop-Helix Transcription Factors - genetics
Basic Helix-Loop-Helix Transcription Factors - metabolism
Biological and medical sciences
Complementary DNA
Excretion
Fundamental and applied biological sciences. Psychology
Genes
Iron
Iron - metabolism
Iron assimilation
Molecular and cellular biology
Molecular genetics
Nicotiana - genetics
Nicotiana - metabolism
Nutrient deficiency
Plant Leaves - metabolism
Plant roots
Plant Roots - metabolism
Plants
Plants, Genetically Modified
riboflavin
Riboflavin - metabolism
Seedlings
Sunflowers
Transcription factor
Transcription factors
Transcription. Transcription factor. Splicing. Rna processing
Transgenic plants
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Summary: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.
ISSN:0032-0935
1432-2048
DOI:10.1007/s00425-006-0476-9