Conservation and Diversification of <Emphasis Type="Italic">SCARECROW</Emphasis> in Maize |
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Authors: | Email author" target="_blank">Jun?LimEmail author Jee?W?Jung Chae?Eun?Lim Mi-Hyun?Lee Bong?Jun?Kim Miran?Kim Wesley?B?Bruce Philip?N?Benfey |
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Institution: | (1) Department of Molecular Biotechnology, Konkuk University, 143-701 Seoul, Korea;(2) Bio/Molecular Informatics Center (BMIC), Konkuk University, 143-701 Seoul, Korea;(3) Department of Advanced Technology Fusion, Konkuk University, 143-701 Seoul, Korea;(4) Department of Biology, Duke University, Durham, North Carolina 27708, USA;(5) Pioneer Hi-Bred International Inc., Johnston, Iowa 50131, USA |
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Abstract: | The SCARECROW (SCR) gene in Arabidopsis is required for asymmetric cell divisions responsible for ground tissue formation in the root and shoot. Previously, we reported
that Zea mays SCARECROW (ZmSCR) is the likely maize ortholog of SCR. Here we describe conserved and divergent aspects of ZmSCR. Its ability to complement the Arabidopsis scr mutant phenotype suggests conservation of function, yet its expression pattern during embryogenesis and in the shoot system
indicates divergence. ZmSCR expression was detected early during embryogenesis and localized to the endodermal lineage in the root, showing a gradual
regionalization of expression. Expression of ZmSCR appeared to be analogous to that of SCR during leaf formation. However, its absence from the maize shoot meristem and its early expression pattern during embryogenesis
suggest a diversification of ZmSCR in the patterning processes in maize. To further investigate the evolutionary relationship of SCR and ZmSCR, we performed a phylogenetic analysis using Arabidopsis, rice and maize SCARECROW-LIKE genes (SCLs). We found SCL23 to be the most closely related to SCR in both eudicots and monocots, suggesting that a gene duplication resulting in SCR and SCL23 predates the divergence of dicots and monocots.
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Keywords: | Arabidopsis GRAS family pattern formation root development SCARECROW |
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