Expression profiles of Br MYB transcription factors related to glucosinolate biosynthesis and stress response in eight subspecies of Brassica rapa

Brassica rapa is a polyploid species with phenotypically diverse cultivated subspecies. Glucosinolates ( GSL s) are secondary metabolites that contribute to anticarcinogenic activity and plant defense in Brassicaceae. Previously, complete coding sequences of 13 Br MYB transcription factors ( TF s) r...

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Veröffentlicht in:FEBS open bio 2017-11, Vol.7 (11), p.1646-1659
Hauptverfasser: Seo, Mi‐Suk, Jin, Mina, Sohn, Seong‐Han, Kim, Jung Sun
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Jin, Mina
Sohn, Seong‐Han
Kim, Jung Sun
description Brassica rapa is a polyploid species with phenotypically diverse cultivated subspecies. Glucosinolates ( GSL s) are secondary metabolites that contribute to anticarcinogenic activity and plant defense in Brassicaceae. Previously, complete coding sequences of 13 Br MYB transcription factors ( TF s) related to GSL biosynthesis were identified in the B. rapa genome. In the present study, we investigated GSL content and expression levels of these Br MYB TF s in 38 accessions belonging to eight subspecies of B. rapa . Twelve identified GSL s were detected and were classified into three chemical groups based on patterns of GSL content and expression profiles of the Br MYB TF s. GSL content and Br MYB TF expression levels differed among genotypes, including B. rapa subspecies pekinensis , chinensis and rapa . Br MYB 28.3 , Br MYB 51.1 and Br MYB 122.2 positively regulated GSL content in 38 accessions. Furthermore, expression levels of Br MYB 28 s and Br MYB 34.3 increased under most abiotic and biotic stress treatments. The three Br MYB 51 paralogs also showed drastically increased expression levels after infection with Pectobacterium carotovorum . The results of the present study improve our understanding of the functional diversity of these 13 Br MYB TF s during the evolution of polyploid B. rapa .
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subjects Amino acids
Biosynthesis
Brassica rapa
Defense mechanisms
Evolution
Flowers & plants
Gene expression
Genomes
Genotypes
Glucosinolates
Metabolites
Morphology
Polyploidy
Rural development
Secondary metabolites
Seeds
Studies
Transcription factors
title Expression profiles of Br MYB transcription factors related to glucosinolate biosynthesis and stress response in eight subspecies of Brassica rapa
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