Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana.

Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana. Research Abstract Details 

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Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana. Abstract Text:

Hong-Yu Wang,Marco Klatte,Marc Jakoby,Helmut ,Bernd Weisshaar,Petra Bauer,

Networks of transcription factors control physiological, developmental and environmental responses. Root iron acquisition responses are controlled by the essential bHLH protein FIT. Recently, two group Ib BHLH genes were reported to be iron deficiency-regulated. Here, we studied expression patterns of these two group Ib BHLH genes and of their two closest homologs to analyze whether their regulation would support a function in iron deficiency responses. We found that BHLH038, BHLH039, BHLH100 and BHLH101 (comprising a subgroup of BHLH Ib genes) were up regulated by iron deficiency in roots and leaves. Single insertion mutants had no visible phenotype and were capable of inducing root iron acquisition responses, presumably due to functional redundancy. Specific metal treatments like nickel, high zinc or high copper resulted in induction of the four BHLH Ib genes whereas high iron, low copper and low zinc repressed gene expression. Induction of the four BHLH Ib genes was also found in multiple iron acquisition mutants including fit. Ectopic activation of FIT did not suppress the four BHLH Ib genes. Split-root analyses using promoter-GUS lines showed that FIT and BHLH100 promoters were controlled by different local and systemic signals involved in their regulation by iron. These results indicated that the four BHLH Ib genes were induced independently from FIT by conditions causing iron deficiency. Taken together, BHLH038, BHLH039, BHLH100 and BHLH101 function differently from FIT and may be involved in mediating a signal related to iron deficiency-induced stress and/or internal iron homeostasis.

Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana. Publishing Authors By Initials

HY Wang,M Klatte,M Jakoby,H ,B Weisshaar,P Bauer,

For similar biochemical phenomena, metabolism, and nutrition: biochemical phenomena: molecular structure: base sequence: regulatory sequences, nucleic acid: promoter regions (genetics) research abstracts see: biochemical phenomena, metabolism, and nutrition: biochemical phenomena: molecular structure: base sequence: regulatory sequences, nucleic acid: promoter regions (genetics) research

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Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Planta

VOLUME: 226

Page Numbers: 897-908

Journal Abbreviation: Planta

ISSN: 0032-0935

DAY: 22

MONTH: 05

YEAR: 2007

Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana. Information

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LANGUAGE: eng

NlmUniqueID: 1250576

Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana. Keywords Mesh Terms:

KEYWORDS: Promoter Regions (Genetics)

MESH TERMS: metabolism

Chemical & Substance for Abstract: Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana. Information

Substance Name: Glucuronidase

Registry Number: EC 3.2.1.31

Grant and Affiliation Information for Iron deficiency-mediated stress regulation of four subgroup Ib BHLH genes in Arabidopsis thaliana.

AFFILIATION: Department of Biosciences, Botany, Saarland University, PO Box 151150, 66041 Saarbrücken, Germany.

Country: Germany

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MEDLINETA: Planta

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