Comparing genomic expression patterns across plant species reveals highly diverged transcriptional dynamics in response to salt stress.
Comparing genomic expression patterns across plant species reveals highly diverged transcriptional dynamics in response to salt stress.
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DOI：
10.1186/1471-2164-10-398
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发表时间：
2009-08-25
期刊：
影响因子：
4.4
通讯作者：
Cui X
中科院分区：
文献类型：
--
作者：
Walia H;Wilson C;Ismail AM;Close TJ;Cui X
水稻和大麦同属禾本科，但在耐盐性上存在显著差异。这种差异背后的分子机制以前未被探索。本研究采用比较基因组学的方法，以确定类似的和对比的基因表达模式之间的水稻和大麦。一个层次聚类方法确定了几个有趣的表达轨迹水稻和大麦基因型。在盐胁迫下，两种植物之间没有主要的保守表达模式。查询小麦盐胁迫数据集与水稻和大麦进行比较。大约三分之一的大麦盐胁迫反应与小麦保持一致，而小麦和水稻之间的重叠是最小的。这些结果表明，在转录组水平，水稻是惊人的不同相比，更密切相关的大麦和小麦。通过对与根生长和发育相关的基因的仔细研究，进一步突出了这种明显缺乏类似的转录程序对盐胁迫的反应。分析提供了支持的假设，即保护转录签名响应环境线索取决于一个物种内的基因型之间的遗传相似性，和物种之间的系统发育距离。
Rice and barley are both members of Poaceae (grass family) but have a marked difference in salt tolerance. The molecular mechanism underlying this difference was previously unexplored. This study employs a comparative genomics approach to identify analogous and contrasting gene expression patterns between rice and barley. A hierarchical clustering approach identified several interesting expression trajectories among rice and barley genotypes. There were no major conserved expression patterns between the two species in response to salt stress. A wheat salt-stress dataset was queried for comparison with rice and barley. Roughly one-third of the salt-stress responses of barley were conserved with wheat while overlap between wheat and rice was minimal. These results demonstrate that, at transcriptome level, rice is strikingly different compared to the more closely related barley and wheat. This apparent lack of analogous transcriptional programs in response to salt stress is further highlighted through close examination of genes associated with root growth and development. The analysis provides support for the hypothesis that conservation of transcriptional signatures in response to environmental cues depends on the genetic similarity among the genotypes within a species, and on the phylogenetic distance between the species.
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11.4
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DOI：
10.1073/pnas.091062498
发表时间：
2001-04-24
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