Component of the PAF1 complex (PAF1C) which is involved in histone modifications such as methylation on histone H3 'Lys-4' (H3K4me3) (PubMed:20363855). Involved in regulation of flowering time. Required for the expression of the flowering repressors and MAD-box genes FLC, AGL27/FLM and AGL31/MAF2. Required for histone H3 trimethylation on 'Lys-4' H3K4me3 at the FLC and AGL27/FLM loci (PubMed:15520273). Involved in the control of seed dormancy and germination (PubMed:21799800). Component of the nuclear PAF1 complex (PAF1C), which consists of VIP2/ELF7/PAF1, VIP3/SKI8/WDR61, VIP4/LEO1, VIP5/RTF1, VIP6/ELF8/CTR9 and CDC73. Expressed in roots, leaves and shoot apex. Early flowering, reduced plant size and defects in floral morphology in whorls 1-3, but fully fertile flowers (PubMed:12750345). Reduced seed dormancy and increased germination rate of freshly harvested seeds (PubMed:21799800). Belongs to the PAF1 family.