Component of the auxin signaling transduction pathway that regulates cell proliferation and differentiation during flowers stigmas and styles development (PubMed:21388377). Involved in the regulation of auxin-related genes (PubMed:22301969). Inside the nucleus, confined to the interchromatic region. Specifically expressed in flowers pistils, especially in stigmas and styles. Barely detected in roots, stems, leaves, sepals, petals and stamen. Expressed at high levels at the early stages of pistil development (stages 1 to 6) and disappears towards anthesis (stages 7 to 12). At stage 4, observed in the stigmatic secretory zone, including the papillar cells, and in the stylar transmitting tissue. Expressed in stigma and style specialized tissues at initial stages of flower development. Enlarged stigmas and styles due to increased in cell numbers.