Plant Molecular Biology

, Volume 78, Issue 1–2, pp 77–93 | Cite as

Deficiency in riboflavin biosynthesis affects tetrapyrrole biosynthesis in etiolated Arabidopsis tissue

  • Boris Hedtke
  • Ali Alawady
  • Alfonso Albacete
  • Koichi Kobayashi
  • Michael Melzer
  • Thomas Roitsch
  • Tatsuru Masuda
  • Bernhard Grimm
Article

Abstract

Tetrapyrrole biosynthesis is controlled by multiple environmental and endogenous cues. Etiolated T-DNA insertion mutants were screened for red fluorescence as result of elevated levels of protochlorophyllide and four red fluorescent in the dark (rfd) mutants were isolated and identified. rfd3 and rfd4 belong to the group of photomorphogenic cop/det/fus mutants. rfd1 and rfd2 had genetic lesions in RIBA1 and FLU encoding the dual-functional protein GTP cyclohydrolase II/3,4-dihydroxy-2-butanone-4-phosphate synthase and a negative regulator of tetrapyrrole biosynthesis, respectively. RIBA1 catalyses the initial reaction of the metabolic pathway of riboflavin biosynthesis and rfd1 contains reduced contents of riboflavin and the flavo-coenzymes FMN and FAD. Transcriptome analysis of rfd1 revealed up-regulated genes encoding nucleus-localized factors involved in cytokinin signalling and numerous down-regulated LEA genes as well as an auxin-inducible GH3 gene. Alteration of cytokinin metabolism of rfd1was confirmed by elevated contents of active forms of cytokinin and stimulated expression of an ARR6::GUS reporter construct. An etiolated quadruple ckx (cytokinin oxidase) mutant with impaired cytokinin degradation as well as different knockout mutants for the negative AUX/IAA regulators shy2-101 (iaa3), axr2-1 (iaa7) and slr-1 (iaa14) showed also excessive protochlorophyllide accumulation. The transcript levels of CHLH and HEMA1 encoding Mg chelatase and glutamyl-tRNA reductase were increased in rfd1 and the AUX/IAA loss-of-function mutants. It is proposed that reduced riboflavin synthesis impairs the activity of the flavin-containing cytokinin oxidase, increases cytokinin contents and de-represses synthesis of 5-aminolevulinic acid of tetrapyrrole metabolism in darkness. As result of the mutant analyses, the antagonistic cytokinin and auxin signalling is required for a balanced tetrapyrrole biosynthesis in the dark.

Keywords

Tetrapyrrole biosynthesis Chlorophyll ALA biosynthesis Protochlorophyllide Riboflavin biosynthesis Phytohormone Cytokinin Auxin T-DNA insertion mutagenesis 

Abbreviations

DBPS

3,4-dihydroxy-2-butanone-4-phosphate synthase

GCHII

GTP cyclohydrolase II

GluTR

Glutamyl-tRNA reductase

GSAT

Glutamate-1-semialdehyde aminotransferase

MgProto

Magnesium protoporphyrin

Pchlide

Protochlorophyllide

POR

Protochlorophyllide oxidoreductase

Proto

Protoporphyrin IX

Supplementary material

11103_2011_9846_MOESM1_ESM.pptx (262 kb)
Supplementary material 1 (PPTX 262 kb)

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Boris Hedtke
    • 1
  • Ali Alawady
    • 1
  • Alfonso Albacete
    • 4
  • Koichi Kobayashi
    • 5
  • Michael Melzer
    • 3
  • Thomas Roitsch
    • 4
  • Tatsuru Masuda
    • 2
  • Bernhard Grimm
    • 1
  1. 1.Institute of Biology/Plant PhysiologyHumboldt University BerlinBerlinGermany
  2. 2.Graduate School of Arts and Sciences, Department of General Systems StudiesThe University of TokyoMeguro, TokyoJapan
  3. 3.Leibniz-Institute of Plant Genetics and Crop Plant ResearchGaterslebenGermany
  4. 4.Institut für PflanzenwissenschaftenBereich Physiologie, Karl-Franzens-UniversitätGrazAustria
  5. 5.RIKEN Plant Science CenterTsurumi-ku, YokohamaJapan

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