Probable transcriptional regulator. May mediate E2- or E3-dependent ubiquitination. Required to gate light sensitivity during the night. Regulates the speed of the clock by acting in the feedback loop between CCA1, LHY and APRR1/TOC1. Promotes the expression of CCA1 at night but not by days. This activational effect is enhanced by interaction with ADO1/ZTL. Association with ADO1/ZTL is not leading to the degradation of NFXL2. Confers sensitivity to osmotic stress such as high salinity. Prevents H(2)O(2) production and abscisic acid accumulation. Part of a regulatory network that integrates the biosynthesis and action of abscisic acid, reactive oxygen species and cuticle components. Protein modification; protein ubiquitination. Interacts with ADO1/ZTL. Additional isoforms seem to exist. Constitutively expressed in mesophyll and guard cells. Circadian-regulation with a peak of expression at or before dawn. Not regulated by biotic and abiotic stresses, by light and nutrient conditions or upon treatment with elicitors, chemicals, abscisic acid or phytohormones. The RING-type zinc finger domain interacts with an ubiquitin-conjugating enzyme (E2) and facilitates ubiquitination. No obvious morphological alterations. Enhanced growth and survival under water or salt stress. Enhanced H(2)O(2) production. Elevated abscisic acid levels and reduced stomatal aperture. Belongs to the NFX1 family.