TITLE:
Characterization of a Tos17 Insertion Mutant of Rice Auxin Signal Transcription Factor Gene, OsARF24
AUTHORS:
Tomoaki Sakamoto, Yoshiaki Inukai
KEYWORDS:
Auxin; Auxin Response Factor (ARF); Mutant; Phyllotaxis; Retrotransposon Tos17; Rice
JOURNAL NAME:
American Journal of Plant Sciences,
Vol.4 No.1,
January
31,
2013
ABSTRACT: Auxin signaling plays a key role in the regulation of various growth and developmental processes in higher plants. Auxin response factors (ARFs) are transcription factors that regulate the expression of auxin-response genes. The osarf24-1 mutant contains a truncation of domain IV in the C-terminal dimerization domain of a rice ARF protein, OsARF24. This mutant showed auxin-deficient phenotypes and reduced sensitivity to auxin. However, OsARF24 protein contains an SPL-rich repression domain in its middle region and acts as a transcriptional repressor. These results imply that the C-terminal dimerization domain, especially the C-terminal half of domain IV, is essential for the proper regulation of OsARF24 function as a transcriptional repressor in rice.