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BREVIPEDICELLUS  ( BP  or  KNAT1 ), a class-I KNOTTED1-like homeobox ( KNOX ) transcription factor in  Arabidopsis thaliana , contributes to shaping the normal inflorescence architecture through negatively regulating other two class-I  KNOX  genes,  KNAT2  and  KNAT6 . However, the molecular mechanism of BP-mediated transcription regulation remains unclear. In this study, we showed that BP directly interacts with the SWI2/SNF2 chromatin remodeling ATPase BRAHMA (BRM) both  in vitro  and  in vivo . Loss-of-function BRM mutants displayed inflorescence architecture defects, with clustered inflorescences, horizontally orientated pedicels, and short pedicels and internodes, a phenotype similar to the  bp  mutants. Furthermore, the transcript levels of  KNAT2  and  KNAT6  were elevated in  brm-3 ,  bp-9  and  brm-3 bp-9  double mutants. Increased histone H3 lysine 4 tri-methylation (H3K4me3) levels were detected in  brm-3 ,  bp-9  and  brm-3 bp-9  double mutants. Moreover, BRM and BP co-target to  KNAT2  and  KNAT6  genes, and BP is required for the binding of BRM to KNAT2 and KNAT6. Taken together, our results indicate that BP interacts with the chromatin remodeling factor BRM to regulate the expression of  KNAT2  and  KNAT6  in control of inflorescence architecture.

plos genetics

Arabidopsis BREVIPEDICELLUS Interacts with the SWI2/SNF2 Chromatin Remodeling ATPase BRAHMA to Regulate KNAT2 and KNAT6 Expression in Control of Inflorescence Architecture