Phylogenetic analysis and molecular evolution of the dormancy associated MADS-box genes from peach.
Phylogenetic analysis and molecular evolution of the dormancy associated MADS-box genes from peach.
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DOI：
10.1186/1471-2229-9-81
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发表时间：
2009-06-27
影响因子：
5.3
通讯作者：
Bielenberg DG
中科院分区：
文献类型：
--
作者：
Jiménez S;Lawton-Rauh AL;Reighard GL;Abbott AG;Bielenberg DG
休眠相关MADS-box （DAM）基因是桃生长停止和顶芽形成调控的候选基因。这些基因在桃常生突变体中不表达，在诱导休眠条件下，桃突变体不能停止生长并进入休眠。我们在MADS-box基因家族的系统发育背景下，分析了DAM基因之间的系统发育关系、分子进化的速率和模式。桃DAM基因归属于II型MIKCC MADS-box基因的SVP/StMADS11谱系。系统发育分析表明，桃SVP/ stmads11样基因家族是通过串联基因重复扩增的，其成员数明显多于一年生模式植物。我们发现有证据表明，强烈的纯化选择抑制了桃子DAM基因之间的功能分化，并且只有位于c端区域的单个密码子存在显著的正选择。由于所有的DAM基因都在桃中表达，并且受到强烈的纯化选择的影响，我们认为复制的基因通过亚功能化和/或新功能化得以维持。此外，这种选择模式表明DAM基因在桃的生长发育中起重要作用。
Dormancy associated MADS-box (DAM) genes are candidates for the regulation of growth cessation and terminal bud formation in peach. These genes are not expressed in the peach mutant evergrowing, which fails to cease growth and enter dormancy under dormancy-inducing conditions. We analyzed the phylogenetic relationships among and the rates and patterns of molecular evolution within DAM genes in the phylogenetic context of the MADS-box gene family. The peach DAM genes grouped with the SVP/StMADS11 lineage of type II MIKCC MADS-box genes. Phylogenetic analyses suggest that the peach SVP/StMADS11-like gene family, which contains significantly more members than annual model plants, expanded through serial tandem gene duplication. We found evidence of strong purifying selection acting to constrain functional divergence among the peach DAM genes and only a single codon, located in the C-terminal region, under significant positive selection. Because all DAM genes are expressed in peach and are subjected to strong purifying selection we suggest that the duplicated genes have been maintained by subfunctionalization and/or neofunctionalization. In addition, this pattern of selection suggests that the DAM genes are important for peach growth and development.
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影响因子：
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通讯作者：
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