{"type": "root", "children": [{"type": "p", "children": [{"type": "t", "text": "\nRUSF1, a member of the RUS (ROOT UV‐B SENSITIVE) family of proteins in Arabidopsis, functions as a critical regulator in early seedling morphogenesis by mediating the plant’s response to low‐intensity UV‐B light. Genetic and molecular studies have revealed that RUSF1 (represented by RUS1) works in concert with its homolog RUS2, a DUF647‐containing protein, to establish a specialized UV‐B sensing pathway in the root. Both proteins exhibit highly similar expression patterns and interact directly through their conserved DUF647 domain; specific residues within this motif are essential for their physical association and proper function. The RUS pathway is vital for normal seedling development under very‐low-fluence UV‐B conditions, and its evolutionary conservation—evidenced by the presence of multiple RUS family members in Arabidopsis, rice, and even moss (with one member extending to animals)—underscores its fundamental role in environmental response and developmental regulation."}, {"type": "fg", "children": [{"type": "fg_f", "ref": "1"}]}, {"type": "t", "text": "\n"}]}, {"type": "rg", "children": [{"type": "r", "ref": 1, "children": [{"type": "t", "text": "Colin D Leasure, Hongyun Tong, Gigi Yuen, et al. "}, {"type": "b", "children": [{"type": "t", "text": "ROOT UV-B SENSITIVE2 acts with ROOT UV-B SENSITIVE1 in a root ultraviolet B-sensing pathway."}]}, {"type": "t", "text": " "}, {"type": "i", "children": [{"type": "t", "text": "Plant Physiol (2009)"}]}, {"type": "t", "text": " DOI: "}, {"type": "a", "children": [{"type": "t", "text": "10.1104/pp.109.139253"}], "href": "https://doi.org/10.1104/pp.109.139253"}, {"type": "t", "text": " PMID: "}, {"type": "a", "children": [{"type": "t", "text": "19515790"}], "href": "https://pubmed.ncbi.nlm.nih.gov/19515790"}]}]}]}