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Characterization of a <i>Tos</i>17 Insertion Mutant of Rice Auxin Signal Transcription Factor Gene, <i>OsARF</i>24
Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Japan
Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
- 1 Faculty of Bioresources and Environmental Sciences, Ishikawa Prefectural University, Nonoichi, Japan
- 2 Graduate School of Bioagricultural Sciences, Nagoya University, Nagoya, Japan
American Journal of Plant Sciences·Volume 04 (2013)·Pages 84–91·Published 30 January 2013·DOI10.4236/ajps.2013.41013
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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 osarf 24-1 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.
KeywordsAuxinAuxin Response Factor (ARF)MutantPhyllotaxisRetrotransposon <i>Tos</i>17Rice
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