植物开花机制是一个复杂而精密的调控网络。组学分析表明,几乎所有光周期开花途径的相关基因或蛋白的昼夜节律性表达都受到生物钟的调控,其中一些关键基因,CYCLING DOF FACTOR 1 (CDF1)、CONSTANS (CO)和FLOWERING LOCUS T (FT)等在光...植物开花机制是一个复杂而精密的调控网络。组学分析表明,几乎所有光周期开花途径的相关基因或蛋白的昼夜节律性表达都受到生物钟的调控,其中一些关键基因,CYCLING DOF FACTOR 1 (CDF1)、CONSTANS (CO)和FLOWERING LOCUS T (FT)等在光周期条件下发挥着重要作用。本研究根据拟南芥生物钟对开花相关基因的调控关系,建立光周期开花路径的微分方程模型。模拟结果表明,在长日照下开花相关基因保持着昼夜节律振荡,FT积累到一定阈值,植物才能开花。此外,基于模型残差的平稳性和纯随机性检验的修正模型,再现了FT的积累量的变化趋势,为预测开花时间提供了一个可靠的分析工具。展开更多
Plants become photosynthetic through de-etiolation, a developmental process regulated by red/far-red light-absorbing phytochromes and blue/ultraviolet A light-absorbing cryptochromes. Genetic screens have identified i...Plants become photosynthetic through de-etiolation, a developmental process regulated by red/far-red light-absorbing phytochromes and blue/ultraviolet A light-absorbing cryptochromes. Genetic screens have identified in the last decade many far-red light signaling mutants and several red and blue light signaling mutants, suggesting the existence of distinct red, far-red, or blue light signaling pathways downstream of phytochromes and cryptochromes. However, genetic screens have also identified mutants with defective de-etiolation responses under multiple wavelengths. Thus, the opti- mal de-etiolation responses of a plant depend on coordination among the different light signaling pathways. This review intends to discuss several recently identified signaling components that have a potential role to integrate red, far-red, and blue light signalings. This review also highlights the recent discoveries on proteolytic degradation in the desensitization of light signal transmission, and the tight connection of light signaling with photoperiodic flowering and circadian rhythm. Studies on the controlling mechanisms of de-etiolation, photoperiodic flowering, and circadian rhythm have been the fascinating topics in Arabidopsis research. The knowledge obtained from Arabidopsis can be readily applied to food crops and ornamental species, and can be contributed to our general understanding of signal perception and transduction in all organisms.展开更多
文摘植物开花机制是一个复杂而精密的调控网络。组学分析表明,几乎所有光周期开花途径的相关基因或蛋白的昼夜节律性表达都受到生物钟的调控,其中一些关键基因,CYCLING DOF FACTOR 1 (CDF1)、CONSTANS (CO)和FLOWERING LOCUS T (FT)等在光周期条件下发挥着重要作用。本研究根据拟南芥生物钟对开花相关基因的调控关系,建立光周期开花路径的微分方程模型。模拟结果表明,在长日照下开花相关基因保持着昼夜节律振荡,FT积累到一定阈值,植物才能开花。此外,基于模型残差的平稳性和纯随机性检验的修正模型,再现了FT的积累量的变化趋势,为预测开花时间提供了一个可靠的分析工具。
文摘Plants become photosynthetic through de-etiolation, a developmental process regulated by red/far-red light-absorbing phytochromes and blue/ultraviolet A light-absorbing cryptochromes. Genetic screens have identified in the last decade many far-red light signaling mutants and several red and blue light signaling mutants, suggesting the existence of distinct red, far-red, or blue light signaling pathways downstream of phytochromes and cryptochromes. However, genetic screens have also identified mutants with defective de-etiolation responses under multiple wavelengths. Thus, the opti- mal de-etiolation responses of a plant depend on coordination among the different light signaling pathways. This review intends to discuss several recently identified signaling components that have a potential role to integrate red, far-red, and blue light signalings. This review also highlights the recent discoveries on proteolytic degradation in the desensitization of light signal transmission, and the tight connection of light signaling with photoperiodic flowering and circadian rhythm. Studies on the controlling mechanisms of de-etiolation, photoperiodic flowering, and circadian rhythm have been the fascinating topics in Arabidopsis research. The knowledge obtained from Arabidopsis can be readily applied to food crops and ornamental species, and can be contributed to our general understanding of signal perception and transduction in all organisms.
