Journal
PLANTA
Volume 237, Issue 5, Pages 1199-1211Publisher
SPRINGER
DOI: 10.1007/s00425-012-1821-9
Keywords
Secondary cell wall; Transcription factor; Lignin; Seed coat; Inflorescence stem; Protein-protein interaction; Mucilage
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Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- NSERC Green Crops Network
- NSERC
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The Arabidopsis thaliana KNAT7 (KNOX family) and MYB75 (MYB family) transcription factors were each shown earlier to interact in yeast two-hybrid assays, and to modulate secondary cell wall formation in inflorescence stems. We demonstrate here that their interaction also occurs in vivo, and that specific domains of each protein mediate this process. The participation of these interacting transcription factors in secondary cell wall formation was then extended to the developing seed coat through the use of targeted transcript analysis and SEM in single loss-of-function mutants. Novel genetic and protein-protein interactions of MYB75 and KNAT7 with other transcription factors known to be involved in seed coat regulation were also identified. We propose that a MYB75-associated protein complex is likely to be involved in modulating secondary cell wall biosynthesis in both the Arabidopsis inflorescence stem and seed coat, and that at least some parts of the transcriptional regulatory network in the two tissues are functionally conserved.
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