RIF1, a putative MYB like transcription factor, negatively regulates secondary cell wall formation in Arabidopsis
Refereed conference paper presented and published in conference proceedings


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AbstractSecondary cell walls (SCWs) are important for plants to support their growth and adapt to changing
environments. SCWs are composed mainly of three biopolymers, namely lignin, cellulose and hemicellulose.
Studies have suggested that the biosynthesis of these biopolymers is regulated by a complex transcriptional
network [1, 2, 3, 4]. However, the details of this transcriptional network have not been fully uncovered. From an
activation tagging based genetic mutant screen in Arabidopsis, we identified a new mutant, rif1 (Respressor of
Interfascicular Fibers 1), which has severe defects in secondary wall formation in stems, making the plant
cannot stand erectly. Microscopy study indicated that the SCW deposition in interfascicular fibers of rif1 is
completely missing, and SCW components assay showed that the levels of the three biopolymers are all
significantly decreased in the rif1 mutant. RIF1 encodes a MYB like transcription factor in Arabidopsis which
has not been characterized before. RIF1 is localized in nucleus and has putative transcriptional regulatory
activity. From a protoplast transcription transient assay, we demonstrate that RIF1 acts as a transcriptional
repressor and negatively regulate several important SCW biosynthesis genes. Our results suggest that RIF1 may
define a novel negative transcription regulator in SCW formation in plants.
All Author(s) ListChunming Wang, Junxian He
Name of ConferenceThe 6th International Conference on Plant Cell Wall Biology (PCWB2017)
Start Date of Conference16/07/2017
End Date of Conference20/07/2017
Place of ConferenceDalian
Country/Region of ConferenceChina
Year2017
Month7
Day16
LanguagesEnglish-United States

Last updated on 2018-07-05 at 12:24