http://192.168.164.12:81/ricewiki/index.php?action=history&feed=atom&title=LOC_Os08g30910 LOC Os08g30910 - Revision history 2026-08-29T15:56:13Z Revision history for this page on the wiki MediaWiki 1.30.0 https://ngdc.cncb.ac.cn/ricewiki/index.php?title=LOC_Os08g30910&diff=175716&oldid=prev Yuelvwaer at 14:55, 1 June 2014 2014-06-01T14:55:52Z <p></p> <table class="diff diff-contentalign-left" data-mw="interface"> <col class="diff-marker" /> <col class="diff-content" /> <col class="diff-marker" /> <col class="diff-content" /> <tr style="vertical-align: top;" lang="en"> <td colspan="2" style="background-color: white; color:black; text-align: center;">← Older revision</td> <td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 14:55, 1 June 2014</td> </tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l1" >Line 1:</td> <td colspan="2" class="diff-lineno">Line 1:</td></tr> <tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">Plant histone methyltransferases; SET domain; demethylases; DNA methylation; retrotransposon; epigenetic modification; rice chromatin</del></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">Introduction：</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>&#160;</div></td></tr> <tr><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Histone lysine methylation plays an important role in heterochromatin formation and reprogramming of gene expression. SET-domain-containing proteins are shown to have histone lysine methyltransferase activities. A large number of SET-domain genes are identified in plant genomes. The function of most SET-domain genes is not known. In this work, we studied the 12 rice (Oryza sativa) homologs of Su(var)3–9, the histone H3 lysine 9 (H3K9) methyltransferase identified in Drosophila. Several rice SUVHs (i.e. SDG714, SDG727, and SDG710) were found to have an antagonistic function to the histone H3K9 demethylase JMJ706, as down-regulation of these genes could partially complement the jmj706 phenotype and reduced histone H3K9 methylation. Down-regulation of a rice Su(var)3–9 homolog (SUVH), namely SDG728, decreased H3K9 methylation and altered seed morphology. Overexpression of the gene increased H3K9 methylation. SDG728 and other SUVH genes were found to be involved in the repression of retrotransposons such as Tos17 and a Ty1-copia element. Analysis of histone methylation suggested that SDG728-mediated H3K9 methylation may play an important role in retrotransposon repression.</div></td><td class='diff-marker'>&#160;</td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Histone lysine methylation plays an important role in heterochromatin formation and reprogramming of gene expression. SET-domain-containing proteins are shown to have histone lysine methyltransferase activities. A large number of SET-domain genes are identified in plant genomes. The function of most SET-domain genes is not known. In this work, we studied the 12 rice (Oryza sativa) homologs of Su(var)3–9, the histone H3 lysine 9 (H3K9) methyltransferase identified in Drosophila. Several rice SUVHs (i.e. SDG714, SDG727, and SDG710) were found to have an antagonistic function to the histone H3K9 demethylase JMJ706, as down-regulation of these genes could partially complement the jmj706 phenotype and reduced histone H3K9 methylation. Down-regulation of a rice Su(var)3–9 homolog (SUVH), namely SDG728, decreased H3K9 methylation and altered seed morphology. Overexpression of the gene increased H3K9 methylation. SDG728 and other SUVH genes were found to be involved in the repression of retrotransposons such as Tos17 and a Ty1-copia element. Analysis of histone methylation suggested that SDG728-mediated H3K9 methylation may play an important role in retrotransposon repression.</div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Gene&#160; &#160; &#160; Clone&#160; &#160; &#160; Chr Locn Hit&#160; Dir FromTo&#160; Type</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">______________________________________________________________________________________________</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 PFG_3B-00273.L chr08 W/19082792-19086784 1000-Promotor C 19081650-19081877 PFG T-DNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 GCAGAGCTGTACCGTGC chr08 W/19082792-19086784 1000-Promotor W 19081897-19081913 smRNA MPSS</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 CTGTACCGTGCAGGCAC chr08 W/19082792-19086784 1000-Promotor W 19081903-19081919 smRNA MPSS</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 smRNA90883_1x chr08 W/19082792-19086784 1000-Promotor W 19082129-19082152 smRNA CSRDB</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 AGAAATGGGCTCGAGTT chr08 W/19082792-19086784 1000-Promotor C 19082140-19082156 smRNA MPSS</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 CGGCTCGAGTTGGTGCC chr08 W/19082792-19086784 1000-Promotor W 19082190-19082206 smRNA MPSS</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL039956 chr08 W/19082792-19086784 Exon C 19085021-19085620 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 RMD_TTosR-04Z11HS51_TosRS chr08 W/19082792-19086784 Exon C 19085209-19085359 RMD T-DNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 RMD_TTosR-04Z11HT27_TosRS chr08 W/19082792-19086784 Exon C 19085216-19085790 RMD T-DNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 PFG_4A-00775.R chr08 W/19082792-19086784 Exon W 19085272-19086009 PFG T-DNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 RMD_04Z11AA68 chr08 W/19082792-19086784 Exon W 19085355-19085620 RMD T-DNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 RMD_TTosL-04Z11AA68_TosRS chr08 W/19082792-19086784 Exon W 19085355-19085620 RMD T-DNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 BT068011 chr08 W/19082792-19086784 Exon W 19085819-19086838 Maize cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL047512 chr08 W/19082792-19086784 Exon C 19086009-19086608 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL047532 chr08 W/19082792-19086784 Exon C 19086009-19086608 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL051969 chr08 W/19082792-19086784 Exon C 19086009-19086608 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 NC0178_0_103_1A chr08 W/19082792-19086784 Exon C 19086009-19086521 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 BT055122 chr08 W/19082792-19086784 Exon W 19086071-19086832 Maize cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL012413 chr08 W/19082792-19086784 Exon W 19086112-19086502 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL049049 chr08 W/19082792-19086784 Exon W 19086151-19086735 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 NE9001_0_502_1A chr08 W/19082792-19086784 Exon C 19086155-19086411 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 BT055367 chr08 W/19082792-19086784 Exon W 19086176-19086638 Maize cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 BT068432 chr08 W/19082792-19086784 Exon W 19086176-19086638 Maize cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 AY187719 chr08 W/19082792-19086784 Exon W 19086185-19086562 Maize cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 At2g23740 chr08 W/19082792-19086784 Exon W 19086185-19086564 Arabidopsis cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 At5g43990 chr08 W/19082792-19086784 Exon W 19086185-19086638 Arabidopsis cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 EU970110 chr08 W/19082792-19086784 Exon W 19086191-19086537 Maize cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 At3g03750 chr08 W/19082792-19086784 Exon W 19086191-19086537 Arabidopsis cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL049037 chr08 W/19082792-19086784 300-UTR3 C 19086206-19086805 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 EU968739 chr08 W/19082792-19086784 Exon W 19086317-19086560 Maize cDNA</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL048039 chr08 W/19082792-19086784 Exon W 19086347-19086946 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; 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text-decoration: none;">Os08g30910 T36759T chr08 W/19082792-19086784 Exon W 19086347-19086798 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 T36794T chr08 W/19082792-19086784 Exon W 19086347-19086802 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 NE4522_0_502_1A chr08 W/19082792-19086784 300-UTR3 C 19086386-19087072 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; 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text-decoration: none;">Os08g30910 FL039835 chr08 W/19082792-19086784 Exon W 19086674-19087269 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL039883 chr08 W/19082792-19086784 Exon W 19086674-19087273 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Os08g30910 FL040227 chr08 W/19082792-19086784 Exon W 19086674-19087273 RTIM Tos17</ins></div></td></tr> <tr><td colspan="2">&#160;</td><td class='diff-marker'>+</td><td style="color:black; 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SET domain; demethylases; DNA methylation; retrotransposon; epigenetic modification; rice chromatin Histone lysine methylation plays an impor..." 2014-05-28T15:54:31Z <p>Created page with &quot;Plant histone methyltransferases; SET domain; demethylases; DNA methylation; retrotransposon; epigenetic modification; rice chromatin Histone lysine methylation plays an impor...&quot;</p> <p><b>New page</b></p><div>Plant histone methyltransferases; SET domain; demethylases; DNA methylation; retrotransposon; epigenetic modification; rice chromatin<br /> Histone lysine methylation plays an important role in heterochromatin formation and reprogramming of gene expression. SET-domain-containing proteins are shown to have histone lysine methyltransferase activities. A large number of SET-domain genes are identified in plant genomes. The function of most SET-domain genes is not known. In this work, we studied the 12 rice (Oryza sativa) homologs of Su(var)3–9, the histone H3 lysine 9 (H3K9) methyltransferase identified in Drosophila. Several rice SUVHs (i.e. SDG714, SDG727, and SDG710) were found to have an antagonistic function to the histone H3K9 demethylase JMJ706, as down-regulation of these genes could partially complement the jmj706 phenotype and reduced histone H3K9 methylation. Down-regulation of a rice Su(var)3–9 homolog (SUVH), namely SDG728, decreased H3K9 methylation and altered seed morphology. Overexpression of the gene increased H3K9 methylation. SDG728 and other SUVH genes were found to be involved in the repression of retrotransposons such as Tos17 and a Ty1-copia element. Analysis of histone methylation suggested that SDG728-mediated H3K9 methylation may play an important role in retrotransposon repression.</div> Yuelvwaer