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An evolutionarily conserved DOF-CONSTANS module controls plant photoperiodic signaling

机译:进化上保守的DOF-CONSTANS模块控制植物光周期信号

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摘要

© 2015 American Society of Plant Biologists. All Rights Reserved. The response to daylength is a crucial process that evolved very early in plant evolution, entitling the early green eukaryote to predict seasonal variability and attune its physiological responses to the environment. The photoperiod responses evolved into the complex signaling pathways that govern the angiosperm floral transition today. The Chlamydomonas reinhardtii DNA-Binding with One Finger (CrDOF) gene controls transcription in a photoperiod-dependent manner, and its misexpression influences algal growth and viability. In short days, CrDOF enhances CrCO expression, a homolog of plant CONSTANS (CO), by direct binding to its promoter, while it reduces the expression of cell division genes in long days independently of CrCO. In Arabidopsis (Arabidopsis thaliana), transgenic plants overexpressing CrDOF show floral delay and reduced expression of the photoperiodic genes CO and FLOWERING LOCUS T. The conservation of the DOF-CO module during plant evolution could be an important clue to understanding diversification by the inheritance of conserved gene toolkits in key developmental programs.
机译:©2015美国植物生物学家学会。版权所有。对日长的响应是一个非常关键的过程,它在植物进化的早期就开始发展,使早期的绿色真核生物有能力预测季节变异并调整其对环境的生理响应。光周期反应演变成如今控制被子植物花卉过渡的复杂信号传导途径。用一根手指的莱茵衣藻DNA结合(CrDOF)基因以光周期依赖性方式控制转录,其错误表达影响藻类的生长和生存能力。在短时间内,CrDOF通过直接与其启动子结合而增强了植物CONSTANS(CO)的同系物CrCO的表达,而在较长的时间内,它独立于CrCO降低了细胞分裂基因的表达。在拟南芥(Arabidopsis thaliana)中,过量表达CrDOF的转基因植物显示出花延迟,并且光周期基因CO和FLOWERING LOCUS T的表达减少。DOF-CO模块在植物进化过程中的保守性可能是通过遗传来了解多样性的重要线索。关键发展计划中的保守基因工具包。

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