Characterization of a Tos17 Insertion Mutant of Rice Auxin Signal Transcription Factor Gene, OsARF24

Tomoaki Sakamoto, Yoshiaki Inukai

Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Japan.
Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan.

DOI: 10.4236/ajps.2013.41013                

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.

Keywords

Auxin; Auxin Response Factor (ARF); Mutant; Phyllotaxis; Retrotransposon Tos17; Rice

Conflicts of Interest

The authors declare no conflicts of interest.

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