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Fig. 8 | BMC Biology

Fig. 8

From: Arabidopsis PRC1 core component AtRING1 regulates stem cell-determining carpel development mainly through repression of class I KNOX genes

Fig. 8

Hypothetical model of AtRING1-mediated KNOX-I repression in carpel development. a Hypothetical dosage effect of KNOX-I explaining the varied severity of carpel developmental defects observed in the studied mutants. Because different KNOX-I genes regulate carpel development with an efficiency of STM > KNAT2 > BP, we propose an effective KNOX-I amount (Y-axis) by considering KNAT2 = 1/N STM and BP = 1/(N + X) STM, with N > 1, X > 0. T1/2 represents the amount for WT carpel development, and Tmin and Tmax indicate the minimum and maximum threshold, respectively, for allowing normal carpel development. Mutants with estimated range of effective KNOX-I levels and respective carpel phenotypes are indicated. b Hypothetical model of AtRING1 function within a gene network controlling floral stem cell activity and carpel development. AtRING1 as well as PRC2 (CLF) and LHP1 are colored. KNOX-I genes (including STM, KNAT2, and BP), CLV3, and the WUS-AG-KNU feedback loop are indicated. Arrows indicate promotion, and T-shaped bars indicate repression

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