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The gene Oryza sativa indoleacetic acid 13(OsIAA13) is involved in auxin signaling and controls the expression of genes that are required for lateral root initiation in rice. The open reading frame (ORF) length of OsIAA13 was 2116 bp. It's located on the long arm of chromosome 3.

A rice gain-of-function mutant, Osiaa13, contains a single amino acid substitution (G to A, which resulted in a single amino acid substitution, glycine (G) to serine (S), in the core sequence in domain II of OsIAA13) in the core sequence required for the degradation of the OsIAA13 protein. The Osiaa13 mutant displayed typical auxin-related phenotypes: the number of lateral roots was significantly reduced and the root gravitropic response was defective. Osiaa13 mutants also exhibited altered GUS staining controlled by the DR5 promoter in lateral root initiation sites. Furthermore, expression levels of several genes that might be associated with lateral root initiation were altered in Osiaa13. OsIAA13 encodes a member of the rice Aux/IAA protein family and is believed to play an essential part in blocking auxin signaling by repressing ARF function as a transcriptional regulator.