Plant Physiology 138:1903-1913 (2005)
© 2005 American Society of Plant Biologists
BREAKTHROUGH TECHNOLOGIES
RNA Silencing of Single and Multiple Members in a Gene Family of Rice1,[w]
Daisuke Miki,
Rika Itoh and
Ko Shimamoto*
Laboratory of Plant Molecular Genetics, Nara Institute of Science and Technology, 8916–5 Takayama, Ikoma 630–0101, Japan
RNA silencing with inverted repeat (IR) constructs has been used to suppress gene expression in various organisms. However, the transitive RNA-silencing effect described in plants may preclude the use of RNA silencing for a gene family. Here, we show that, in rice (Oryza sativa), transitive RNA silencing (spreading of double-stranded RNA along the target mRNA) occurred with the green fluorescent protein transgene but not with the endogenous phytoene desaturase gene. We fused IR copies of unique 3' untranslated regions derived from the rice OsRac gene family to a strong promoter and stably introduced them into rice. Each of the seven members of the OsRac gene family was specifically suppressed by its respective IR construct. We also examined IR constructs in which multiple 3' untranslated regions were fused and showed that three members of the OsRac gene family were effectively suppressed by a single construct. Using highly conserved regions of the two members of the OsRac gene family, we also suppressed the expression of all members of the gene family with variable efficiencies. These results suggest that RNA silencing is a useful method for the functional analysis of gene families in rice and other plants.
1 This work was supported by the Research for the Future Program of the Japan Society for the Promotion of Science (grant no. JSPS–RFTF 00L01604) and by the Ministry of Agriculture, Forestry, and Fisheries of Japan (Rice Genome Project).
[w] The online version of this article contains Web-only data.
www.plantphysiol.org/cgi/doi/10.1104/pp.105.063933.
* Corresponding author; e-mail simamoto{at}bs.naist.jp; fax 81–743–72–5509.
Received April 7, 2005;
returned for revision May 22, 2005;
accepted May 23, 2005.
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