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- 저자 : Fornara, Fabio (검색결과 1 건)
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The D-lineage MADS-box gene <i>OsMADS13</i> controls ovule identity in rice
Dreni, Ludovico,Jacchia, Sara,Fornara, Fabio,Fornari, Monica,Ouwerkerk, Pieter B. F.,An, Gynheung,Colombo, Lucia,Kater, Martin M. Blackwell Publishing Ltd 2007 The Plant journal Vol.52 No.4
<P>Summary</P><P>Genes that control ovule identity were first identified in <I>Petunia</I>. Co-suppression of both <I>FLORAL BINDING PROTEIN 7</I> (<I>FBP7</I>) and <I>FBP11</I>, two D-lineage genes, resulted in the homeotic transformation of ovules into carpelloid structures. Later in Arabidopsis it was shown that three genes, <I>SHATTERPROOF1</I> (<I>SHP1</I>), <I>SHP2,</I> and <I>SEEDSTICK</I> (<I>STK</I>), redundantly control ovule identity, because in the <I>stk shp1 shp2</I> triple mutant ovules lose identity and are transformed into carpel and leaf-like structures. Of these three Arabidopsis genes <I>STK</I> is the only D-lineage gene, and its expression, like <I>FBP7</I> and <I>FBP11</I>, is restricted to ovules. <I>OsMADS13</I> is the rice ortholog of <I>STK</I>, <I>FBP7,</I> and <I>FBP11</I>. Its amino acid sequence is similar to the Arabidopsis and <I>Petunia</I> proteins, and its expression is also restricted to ovules. We show that the <I>osmads13</I> mutant is female sterile and that ovules are converted into carpelloid structures. Furthermore, making carpels inside carpels, the <I>osmads13</I> flower is indeterminate, showing that <I>OsMADS13</I> also has a function in floral meristem determinacy. <I>OsMADS21</I> is most likely to be a paralog of <I>OsMADS13</I>, although its expression is not restricted to ovules. Interestingly, the <I>osmads21</I> mutant did not show any obvious phenotype. Furthermore, combining the <I>osmads13</I> and the <I>osmads21</I> mutants did not result in any additive ovule defect, indicating that <I>osmads21</I> does not control ovule identity. These results suggest that during evolution the D-lineage gene <I>OsMADS21</I> has lost its ability to determine ovule identity.</P>
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