FKF1是响应蓝光节律表达的基因,是光周期途径调控植物开花的重要因子之一。为探索BdFKF1基因在光周期途径中调控烟草植株开花的分子机制,该研究以野生型烟草(SR1)和转BdFKF1基因烟草(BdFKF1-OE)植株为材料,利用转录组学测序技术并进行RT...FKF1是响应蓝光节律表达的基因,是光周期途径调控植物开花的重要因子之一。为探索BdFKF1基因在光周期途径中调控烟草植株开花的分子机制,该研究以野生型烟草(SR1)和转BdFKF1基因烟草(BdFKF1-OE)植株为材料,利用转录组学测序技术并进行RT-qPCR验证,观测并记录2种材料的开花时间。结果表明:(1)在SR1 vs FKF1组中,共筛选出472个差异表达基因,包括上调基因248个、下调基因224个,其中与光周期相关的差异表达基因有14个,包括上调基因7个、下调基因7个。(2)GO富集分析发现,差异表达基因大量富集在U5小核核糖核蛋白体和氧化还原酶活性,作用于成对供体和蓝光反应等通路中,其中与光周期相关的差异表达基因主要富集在FK506结合、光周期和开花、光周期、磷脂酰乙醇胺结合、大环内酯结合、花发育调控等通路中。(3)KEGG富集分析发现,差异表达基因主要富集在ABC转运蛋白、内质网中的蛋白质加工、角质,木栓素和蜡的生物合成、昼夜节律-植物等通路中,其中与光周期相关的差异表达基因主要富集在植物激素信号转导、昼夜节律-植物通路中。(4)通过观察记录发现BdFKF1-OE植株开花时间比SR1提前3.9 d。(5)RT-qPCR结果与转录组学数据变化趋势基本一致,表明转录组数据有较高的可靠性。综上认为,在长日照条件下,BdFKF1基因会影响光周期途径相关基因的表达,同时过表达BdFKF1基因具有促进烟草植株开花的作用。展开更多
The reliability of global navigation satellite system(GNSS)positioning degrades when satellite signals are interfered.Such degradation is hard to be deteced by a micro-electro mechanical system(MEMS)based inertial sys...The reliability of global navigation satellite system(GNSS)positioning degrades when satellite signals are interfered.Such degradation is hard to be deteced by a micro-electro mechanical system(MEMS)based inertial system(INS)/GNSS,integrating navigation system with a conventional Kalman filtering,which results in potential integrity problem of the system.Hence,an algorithm combining wireless fidelity(WiFi)signal with a federated Kalman filter(FKF)is proposed to identify the system integrity in dense urban navigation.The criterion of the system integrity detection is created followed by the derivation of the integrity coefficient.The field test shows that integrity changes can be captured by applying WiFi,and the maximum positioning error is reduced by 67% without compensation of inertial sensors in integrity deterioration.展开更多
Plants constantly survey the surrounding environment using several sets of photoreceptors. They can sense changes in the quantity （= intensity） and quality （=wavelength） of light and use this information to adjust...Plants constantly survey the surrounding environment using several sets of photoreceptors. They can sense changes in the quantity （= intensity） and quality （=wavelength） of light and use this information to adjust their physiological responses, growth, and developmental patterns. In addition to the classical photoreceptors, such as phytochromes, crypto- chromes, and phototropins, ZEITLUPE （ZTL）, FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 （FKF1）, and LOV KELCH PROTEIN 2 （LKP2） proteins have been recently identified as blue-light photoreceptors that are important for regulation of the circadian clock and photoperiodic flowering. The ZTL/FKF1/LKP2 protein family possesses a unique combination of domains： a blue-light-absorb- ing LOV （Light, Oxygen, or Voltage） domain along with domains involved in protein degradation. Here, we summarize recent advances in our understanding of the function of the Arabidopsis ZTL/FKF1/LKP2 proteins. We summarize the distinct pho- tochemical properties of their LOV domains and discuss the molecular mechanisms by which the ZTL/FKF1/LKP2 proteins reg- ulate the circadian clock and photoperiodic flowering by controlling blue-light-dependent protein degradation.展开更多
文摘FKF1是响应蓝光节律表达的基因,是光周期途径调控植物开花的重要因子之一。为探索BdFKF1基因在光周期途径中调控烟草植株开花的分子机制,该研究以野生型烟草(SR1)和转BdFKF1基因烟草(BdFKF1-OE)植株为材料,利用转录组学测序技术并进行RT-qPCR验证,观测并记录2种材料的开花时间。结果表明:(1)在SR1 vs FKF1组中,共筛选出472个差异表达基因,包括上调基因248个、下调基因224个,其中与光周期相关的差异表达基因有14个,包括上调基因7个、下调基因7个。(2)GO富集分析发现,差异表达基因大量富集在U5小核核糖核蛋白体和氧化还原酶活性,作用于成对供体和蓝光反应等通路中,其中与光周期相关的差异表达基因主要富集在FK506结合、光周期和开花、光周期、磷脂酰乙醇胺结合、大环内酯结合、花发育调控等通路中。(3)KEGG富集分析发现,差异表达基因主要富集在ABC转运蛋白、内质网中的蛋白质加工、角质,木栓素和蜡的生物合成、昼夜节律-植物等通路中,其中与光周期相关的差异表达基因主要富集在植物激素信号转导、昼夜节律-植物通路中。(4)通过观察记录发现BdFKF1-OE植株开花时间比SR1提前3.9 d。(5)RT-qPCR结果与转录组学数据变化趋势基本一致,表明转录组数据有较高的可靠性。综上认为,在长日照条件下,BdFKF1基因会影响光周期途径相关基因的表达,同时过表达BdFKF1基因具有促进烟草植株开花的作用。
基金Supported by the National Natural Science Foundation of China(61173076)
文摘The reliability of global navigation satellite system(GNSS)positioning degrades when satellite signals are interfered.Such degradation is hard to be deteced by a micro-electro mechanical system(MEMS)based inertial system(INS)/GNSS,integrating navigation system with a conventional Kalman filtering,which results in potential integrity problem of the system.Hence,an algorithm combining wireless fidelity(WiFi)signal with a federated Kalman filter(FKF)is proposed to identify the system integrity in dense urban navigation.The criterion of the system integrity detection is created followed by the derivation of the integrity coefficient.The field test shows that integrity changes can be captured by applying WiFi,and the maximum positioning error is reduced by 67% without compensation of inertial sensors in integrity deterioration.
文摘Plants constantly survey the surrounding environment using several sets of photoreceptors. They can sense changes in the quantity （= intensity） and quality （=wavelength） of light and use this information to adjust their physiological responses, growth, and developmental patterns. In addition to the classical photoreceptors, such as phytochromes, crypto- chromes, and phototropins, ZEITLUPE （ZTL）, FLAVIN-BINDING, KELCH REPEAT, F-BOX 1 （FKF1）, and LOV KELCH PROTEIN 2 （LKP2） proteins have been recently identified as blue-light photoreceptors that are important for regulation of the circadian clock and photoperiodic flowering. The ZTL/FKF1/LKP2 protein family possesses a unique combination of domains： a blue-light-absorb- ing LOV （Light, Oxygen, or Voltage） domain along with domains involved in protein degradation. Here, we summarize recent advances in our understanding of the function of the Arabidopsis ZTL/FKF1/LKP2 proteins. We summarize the distinct pho- tochemical properties of their LOV domains and discuss the molecular mechanisms by which the ZTL/FKF1/LKP2 proteins reg- ulate the circadian clock and photoperiodic flowering by controlling blue-light-dependent protein degradation.
