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首页> 美国卫生研究院文献>The Plant Cell >Establishment of the Vernalization-Responsive Winter-Annual Habit in Arabidopsis Requires a Putative Histone H3 Methyl Transferase
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Establishment of the Vernalization-Responsive Winter-Annual Habit in Arabidopsis Requires a Putative Histone H3 Methyl Transferase

机译：在拟南芥中建立春化响应性冬季年度习性需要假定的组蛋白H3甲基转移酶

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摘要

Winter-annual accessions of Arabidopsis thaliana are often characterized by a requirement for exposure to the cold of winter to initiate flowering in the spring. The block to flowering prior to cold exposure is due to high levels of the flowering repressor FLOWERING LOCUS C (FLC). Exposure to cold promotes flowering through a process known as vernalization that epigenetically represses FLC expression. Rapid-cycling accessions typically have low levels of FLC expression and therefore do not require vernalization. A screen for mutants in which a winter-annual Arabidopsis is converted to a rapid-cycling type has identified a putative histone H3 methyl transferase that is required for FLC expression. Lesions in this methyl transferase, EARLY FLOWERING IN SHORT DAYS (EFS), result in reduced levels of histone H3 Lys 4 trimethylation in FLC chromatin. EFS is also required for expression of other genes in the FLC clade, such as MADS AFFECTING FLOWERING2 and FLOWERING LOCUS M. The requirement for EFS to permit expression of several FLC clade genes accounts for the ability of efs lesions to suppress delayed flowering due to the presence of FRIGIDA, autonomous pathway mutations, or growth in noninductive photoperiods. efs mutants exhibit pleiotropic phenotypes, indicating that the role of EFS is not limited to the regulation of flowering time.
机译：拟南芥的冬季一年生登录通常以需要暴露于冬季寒冷以在春季开始开花为特征。冷暴露之前开花的阻滞是由于开花阻遏物FLOWERING LOCUS C（FLC）的含量较高。暴露于寒冷会通过表观遗传抑制FLC表达的春化过程促进开花。快速循环种质通常具有低水平的FLC表达，因此不需要春化处理。筛选突变体，其中将冬季一年的拟南芥转化为快速循环型，已鉴定出FLC表达所需的推定的组蛋白H3甲基转移酶。这种甲基转移酶中的病变，即早期开花（EFS），导致FLC染色质中组蛋白H3 Lys 4三甲基化水平降低。在FLC进化枝中表达其他基因（例如MADS AFFECTING FLOWERING2和FLOWERING LOCUS M）也需要EFS。允许EFS允许表达多个FLC进化枝基因的要求是 efs 病变的能力抑制由于 FRIGIDA 的存在，自主途径突变或非诱导性光周期的增长而导致的延迟开花。 efs 突变体表现出多效性表型，表明 EFS 的作用不仅限于开花时间的调控。

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