The Mediator complex subunits MED25/PFT1 and MED8 are required for transcriptional responses to changes in cell wall arabinose composition and glucose treatment in Arabidopsis thaliana

BMC Plant Biology
Mathilde Seguela-ArnaudMichael W Bevan

Abstract

Plant cell walls are dynamic structures involved in all aspects of plant growth, environmental interactions and defense responses, and are the most abundant renewable source of carbon-containing polymers on the planet. To balance rigidity and extensibility, the composition and integrity of cell wall components need to be tightly regulated, for example during cell elongation. We show that mutations in the MED25/PFT1 and MED8 subunits of the Mediator transcription complex suppressed the sugar-hypersensitive hypocotyl elongation phenotype of the hsr8-1 mutant, which has cell wall defects due to arabinose deficiency that do not permit normal cell elongation. This suppression occurred independently of light and jasmonic acid (JA) signaling. Gene expression analyses revealed that the expression of genes induced in hsr8-1 that encode enzymes and proteins that are involved in cell expansion and cell wall strengthening is reduced in the pft1-2 mutant line, and the expression of genes encoding transcription factors involved in reducing hypocotyl cell elongation, genes encoding cell wall associated enzymes and proteins is up-regulated in pft1-2. PFT1 was also required for the expression of several glucose-induced genes, including those en...Continue Reading

Associated Datasets

Mar 1, 2014·Michael W Bevan

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Citations

Jun 12, 2016·Developmental Biology·Manuel Buendía-Monreal, C Stewart Gillmor
Mar 21, 2018·Journal of Lipid Research·Johan EdqvistTiina A Salminen
Apr 23, 2019·The New Phytologist·Chunzhao ZhaoJian-Kang Zhu
Sep 11, 2019·Journal of Experimental Botany·Xiangying MaoClint Chapple
Jul 1, 2017·Frontiers in Plant Science·Kemal Kazan
Oct 21, 2020·Journal of Experimental Botany·Rhonda C MeyerThomas Altmann
Jun 20, 2020·Journal of Agricultural and Food Chemistry·Sarahani HarunZeti-Azura Mohamed-Hussein

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Datasets Mentioned

BETA
E-MTAB-2297

Methods Mentioned

BETA
PCR
Chip

Software Mentioned

Partek
ImageJ
Genstat
Partek Genomics Suite

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