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Background  Trichome formation in Arabidopsis is regulated by a MBW complex formed by MYB, bHLH and WD40 transcriptional factors, which can activate  GLABRA2  ( GL2 ) and the R3 MYB transcription factor genes. GL2 promotes trichome formation, whereas R3 MYBs are able to block the formation of the MBW complex. It has been reported that the C2H2 transcription factor GIS (GLABROUS INFLORESCENCE STEMS) functions upstream of the MBW activator complex to regulate trichome formation, and that the expression of TCL1 is not regulated by the MBW complex. However,  gis  and the R3 MYB gene mutant  tcl1  ( trichomeless 1 ) have opposite inflorescence trichome phenotypes, but their relationship in regulating trichome formation remained unknown.    Results  By generating and characterization of the  gis tcl1  double mutant, we found that trichome formation in the  gis tcl1 double and the  tcl1  single mutants were largely indistinguishable, but the trichome formation in the  35S:TCL1 / gis  transgenic plant was similar to that in the  gis  mutant. By using quantitative RT-PCR analysis, we showed that expression level of  GIS  was increased in the triple mutant  tcl1 try cpc , but the expression level of  TCL1  was not affected in the  gis  mutant. On the other hand, trichome morphology in both  gis tcl1  and  35S:TCL1 / gis  plants was similar to that in the  gis  mutant.    Conclusions  In summary, our results indicate that GIS may work downstream of TCL1 to regulate trichome formation, and GIS has a dominant role in controlling trichome morphology.

Genetic evidence suggests that GIS functions downstream of TCL1 to regulate trichome formation in Arabidopsis