Involved in the regulation of shoot gravitropism, and tassel and ear development through the regulation of polar auxin transport (PAT) and auxin signaling. Acts as negative regulator of basipetal PAT, but positive regulator of lateral auxin transport (PubMed:24089437). Involved in the regulation of shoot gravitropism and leaf angle through the regulation of cell development (PubMed:24987012). Expressed in the node of the stem, initiating leaf founder cells, young leaf primordia, tips of axillary meristems, spikelet pair meristems of developing tassels and ears, male flower primordia, tassels, ears, silks and seeds (PubMed:24089437). Expressed in leaf sheaths, leaf pulvinus and shoot apical meristem (SAM) (PubMed:24987012). Transiently down-regulated by auxin. Down-regulated by light. Reduced shoot gravitropism and defective inflorescence development (PubMed:24089437). Reduced shoot gravitropism and increased leaf angle (PubMed:24987012). Belongs to the LAZY family.