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| 著者 | Song X., Wang D., Ma L., Chen Z., Li P., Cui X., Liu C., Cao S., Chu C., Tao Y., Cao X. | |
| タイトル | Rice RNA-dependent RNA polymerase 6 acts in small RNA biogenesis and spikelet development. | |
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Abstract: Higher plants have evolved multiple RNA-dependent RNA polymerases (RDRs), which work with Dicer-like (DCL) proteins to produce different classes of small RNAs with specialized molecular functions. Here we report that OsRDR6, the rice homolog of Arabidopsis RDR6, acts in the biogenesis of various types and sizes of small RNAs. We isolated a rice OsRDR6-1 mutant, which was temperature sensitive and showed spikelet defects. This mutant displays reduced accumulation of tasiR-ARFs, the conserved trans-acting siRNAs (tasiRNAs) derived from the TAS3 locus, and ectopic expression of tasiR-ARF target genes, the Auxin Response Factors (including ARF2 and ARF3/ETTIN). The loss of tasiR-mediated repression of ARFs in OsRDR6-1 can explain its morphological defects, as expression of two non-targeted ARF3 gene constructs (ARF3muts) in a wild-type background mimics the OsRDR6 and osdcl4-1 mutant phenotypes. Small RNA high-throughput sequencing also reveals that besides tasiRNAs, 21-nucleotide (nt) phased small RNAs are also largely dependent on OsRDR6. Unexpectedly, we found that OsRDR6-1 has a strong impact on accumulation of 24-nt phased small RNAs but not on unphased ones. Our work uncovers the key roles of OsRDR6 in small RNA biogenesis and directly illustrates the crucial functions of tasiR-ARFs in rice development. Published 2012. This article is a US Government work and is in the public domain in the USA. |
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| 掲載誌 | Plant J. | |
| Country | China | |
| 刊数 | 71(3) | |
| ページ | 378-89 | |
| 発刊年 | 2012 | |
| PubMed ID | 22443269 | |
| PubMed Central ID | - | |
| DOI | - | |
| URL | - | |
| 関連情報 | ||
| 遺伝子 | ETT1 ETT2 SHL2 SHO1 | |
| INSD | - | |
| 系統 |
野生イネ コアコレクション |
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| 突然変異系統(遺伝研 Collection) | - | |
| 種子不稔系統 | - | |
| 致死変異体系統 | - | |
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組織別発生段階 - 突然変異系統(遺伝子) |
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| 栽培イネ品種(遺伝研 Collection) | - | |
| 組織別発生段階 | - | |
