Title: MYB34, MYB51 and MYB122 Distinctly Regulate Indolic Glucosinolate Biosynthesis in Arabidopsis thaliana
Authors    Frerigmann, H., Gigolashvili, T.
Type    Research_article
Journal    MOLECULAR PLANT
Year    2014
TAIR accession    Publication:501757561
DOI    10.1093/mp/ssu004
PubMed ID    24431192
Abstract    The MYB34, MYB51 and MYB122 transcription factors are known to regulate indolic glucosinolate (IG) biosynthesis in Arabidopsis thaliana. To determine the distinct regulatory potential of MYB34, MYB51 and MYB122, the accumulation of IGs in different parts of plants and upon treatment with plant hormones were analysed in A. thaliana seedlings. It was shown that MYB34, MYB51 and MYB122 act together to control the biosynthesis of I3M in shoots and roots, with MYB34 controlling biosynthesis of IGs mainly in the roots, MYB51 regulating biosynthesis in shoots and MYB122 having an accessory role in the biosynthesis of IGs. Analysis of glucosinolate levels in seedlings of myb34, myb51, myb122, myb34 myb51 double and myb34 myb51 myb122 triple knock-out mutants grown in the presence of abscisic acid (ABA), salicylic acid (SA), jasmonate (JA) or ethylene (ET), revealed that: (i) MYB51 is the central regulator of IG synthesis upon SA and ET signalling, (ii) MYB34 is the key regulator upon ABA and JA signalling and (iii) MYB122 plays only a minor role in JA/ET-induced glucosinolate biosynthesis. The myb34 myb51 myb122 triple mutant is devoid of IGs indicating that these three MYB factors are indispensable for IG production under standard growth conditions.
      The publisher has kindly granted permission to reproduce this abstract on TAIR.
Associated Keywords   growth
Associated Loci   AT1G18570  AT1G74080  AT5G60890 
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