Involved in the regulation of shoot gravitropism (PubMed:23331961, PubMed:25028496). Involved in the regulation of inflorescence branch angle (PubMed:23331961). Functions redundantly with LAZY2, LAZY3 and LAZY4 to control plant architecture by coupling gravity sensing to the formation of auxin gradients (PubMed:28821594). Involved redundantly with LAZY2 and LAZY4 in the regulation of both shoot and root gravitropism (PubMed:28765510). Mediates gravity signaling in statocytes downstream of amyloplast displacement, leading to the generation of asymmetric auxin distribution in gravity-responding organs (PubMed:28765510). Regulates the direction of polar auxin transport in response to gravity through the control of asymmetric PIN3 expression in the root cap columella (PubMed:28765510). Regulation of auxin flow by the three proteins LAZY1, LAZY2 and LAZY4 in statocytes influences plant architecture by controlling the growth angle of lateral shoots and lateral roots (PubMed:28765510). Expressed in shoot apical meristem, vascular tissues, stele, endodermis and upper portion of the inflorescence stem (PubMed:23331961). Expressed in the endodermis of inflorescence stems and hypocotyls (PubMed:28765510). Defective shoot gravitropism (PubMed:23331961, PubMed:25028496). Increased angle of inflorescence branches (PubMed:23331961). Belongs to the LAZY family.