Plant Biotechnology Reports

  • 제4권3호
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  • Pages.185-192
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  • 2010
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  • 1863-5466(pISSN)
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  • 1863-5474(eISSN)
한국식물생명공학회 (The Korean Society of Plant Biotechnology)
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Cosuppression and RNAi induced by Arabidopsis ortholog gene sequences in tobacco

  • 투고 : 2010.01.19
  • 심사 : 2010.01.27
  • 발행 : 2010.09.30
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초록

The Arabidopsis ${\omega}$-3 fatty acid desaturase (AtFAD7) catalyzes the synthesis of trienoic fatty acids (TA). A transgenic tobacco line, T15, was produced by a sense AtFAD7 construct and showed a cosuppression-like phenotype, namely extremely low TA levels. The sequence similarity between AtFAD7 and a tobacco ortholog gene, NtFAD7, was moderate (about 69%) in the coding sequences. AtFAD7 siRNAs accumulated at a high level, and both AtFAD7 and NtFAD7 mRNAs are degraded in T15 plants. The low-TA phenotype in T15 was dependent on a tobacco RNA-dependent RNA polymerase6 (NtRDR6). We also produced tobacco RNAi plants targeting AtFAD7 gene sequences. The AtFAD7 siRNA level was trace, which was associated with a slight reduction in leaf TA level. Unexpectedly, this RNAi plant showed an increased NtFAD7 transcript level. To investigate the effect of translational inhibition on stability of the NtFAD7 mRNAs, leaves of the wild-type tobacco plants were treated with a translational inhibitor, cycloheximide. The level of NtFAD7 mRNAs significantly increased after cycloheximde treatment. These results suggest that the translational inhibition by low levels of AtFAD7 siRNAs or by cycloheximide increased stability of NtFAD7 mRNA. The degree of silencing by an RNAi construct targeting the AtFAD7 gene was increased by co-existence of the AtFAD7 transgene, where NtRDR6-dependent amplification of siRNAs occurred. These results indicate that NtRDR6 can emphasize silencing effects in both cosuppression and RNAi.

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  1. A tobacco calmodulin-related protein suppresses sense transgene-induced RNA silencing but not inverted repeat-induced RNA silencing vol.116, pp.1, 2010, https://doi.org/10.1007/s11240-013-0381-4