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HAG2/MYB76 and HAG3/MYB29 exert a specific and coordinated control on the regulation of aliphatic glucosinolate biosynthesis in Arabidopsis thaliana

T. Gigolashvili ; Martin Engqvist (Institutionen för kemi- och bioteknik, Systembiologi) ; R. Yatusevich ; C. Müller ; U.I. Flügge
New Phytologist (0028-646X). Vol. 177 (2008), 3, p. 627-642.
[Artikel, refereegranskad vetenskaplig]

In a previous transactivation screen, two Arabidopsis thaliana R2R3-MYB transcription factors, HAG2/MYB76 and HAG3/MYB29, along with the already characterized HAG1/MYB28, were identified as putative regulators of aliphatic glucosinolate biosynthesis. • Molecular and biochemical characterization of HAG2/MYB76 and HAG3/MYB29 functions was performed using transformants with increased or repressed transcript levels. Real-time PCR assays, cotransformation assays and measurements of glucosinolate contents were used to assess the impact of both MYB factors on the steady-state level of glucosinolate biosynthetic genes and accumulation of aliphatic glucosinolates. • Both HAG2/MYB76 and HAG3/MYB29 were shown to be positive regulators of aliphatic glucosinolate biosynthesis. Expression of promoter-β- glucuronidase (GUS) fusions indicated GUS activities in both vegetative and generative organs, with distinct characteristics for each MYB factor. HAG1/MYB28, HAG2/MYB76 and HAG3/MYB29 reciprocally transactivated each other in the control of aliphatic glucosinolate biosynthesis and downregulated the expression of genes involved in the control of indolic glucosinolate biosynthesis, pointing to a reciprocal negative regulation of these two pathways. • All three HAG transcription factors exert a coordinated control on aliphatic glucosinolate biosynthesis.

Nyckelord: Glucosinolates , Methyl jasmonate-responsive genes , MYB transcription factors , Regulatory network , Transactivation

Denna post skapades 2017-02-13.
CPL Pubid: 248103


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Institutionen för kemi- och bioteknik, Systembiologi (2008-2014)



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