Transcriptional activator that binds DNA on GAGA-like motif and 5'-(C/G)ACGTG(G/T)C(A/G)-3' consensus motif in the promoters of target genes (PubMed:27495811). Component of ribonucleosomes, which are complexes of at least 20 other different heterogeneous nuclear ribonucleoproteins (hnRNP). hnRNP play an important role in processing of precursor mRNA in the nucleus (By similarity). Required during flower development and for cell fate determination (PubMed:21304947). Acts both as an antagonist and as a promoter of polycomb LHP1 gene regulation activity, depending of target genes, to regulate the transcription of stress-responsive and flowering genes (PubMed:21304947, PubMed:27495811). May regulate histone H3 trimethylation on lysine 27 (H3K27me3) (PubMed:21304947). Recognizes and binds histone H3 tails methylated at 'Lys-4' (H3K4me) and acetylated at 'Lys-9' (H3K9ac), leading to epigenetic activation. When in complex with LHP1, recognizes and binds histone H3 tails methylated at 'Lys-4' (H3K4me) and 'Lys-27' (H3K27me), mostly corresponding to stress-responsive genes (PubMed:27495811). May function as a suppressor of cell-autonomous immune responses involving glucosinolates, salicylic acid (SA) and jasmonic acid (JA) pathways toward pathogenic bacteria and fungi (PubMed:24914891). Interacts with LHP1 in the nucleus on a common set of chromatin regions. Localized in cytoplasmic mRNP granules containing untranslated mRNAs. Predominantly expressed in vascular and meristematic tissues. Expressed throughout development in seedlings, roots, leaves, floral buds and siliques. In young plants, expressed in the distal regions of cotyledons, throughout leaves and root apical meristem, lateral root meristems and young floral buds. Strongly detected in the vascular tissues of various organs (e.g. roots, leaves, hypocotyls, sepals, petals, anther filaments) as well as in the gynophore. In the gynoecium, mainly detected in apical and basal regions as well as in the developing ovules in these regions. Slighty induced upon pathogen infection (e.g. P.syringae) (PubMed:24914891). Rapidly recruited to chromatin upon methyl jasmonate treatment (MeJA) to mediate transcriptional gene activation (PubMed:27495811). Mild early flowering phenotype, reduced rosette diameter, abnormal floral developmental homeostasis and altered gynoecium growth determination associated with indeterminate ovaries growth. Production of ectopic inflorescences with severely affected flowers showing proliferation of ectopic stigmatic papillae and ovules in short-day conditions. Repression of FLC accompanied by an increase in histone H3 trimethylation on lysine 27 (H3K27me3). Altered expression of several genes, including LHP1-regulated genes (PubMed:21304947). Basal primed defense state due to changes in the basal expression of the salicylic acid (SA)- and jasmonic acid (JA)- dependent defense marker genes PR1 and PDF1.2, and altered composition of glucosinolates, a class of defense-related secondary metabolites. Reduced susceptibility to the hemi-biotrophic bacteria pathogen P.syringae and the necrotrophic ascomycete B.cinerea (PubMed:24914891).