Component of the auxin signaling transduction pathway that regulates cell proliferation and differentiation during flowers stigmas and styles development (PubMed:25443839). Involved in the regulation of auxin-related genes (PubMed:22301969, PubMed:25443839). Inside the nucleus, confined to the interchromatic region. Increased cell number in upper pistils leading to enhanced stigmatic structure. Impaired siliques formation. Reduced expression of auxin-related genes.