Plants have to cope with the surrounding changing environmental stimuli to optimize their physiological and devel-opmental response throughout their entire life cycle.Light and temperature are two critical environment...Plants have to cope with the surrounding changing environmental stimuli to optimize their physiological and devel-opmental response throughout their entire life cycle.Light and temperature are two critical environmental cues that fluctuate greatly during day-night cycles and seasonal changes.These two external signals coordinately control the plant growth and development.Distinct spectrum of light signals are perceived by a group of wavelength-specific photoreceptors in plants.PIFs and COP1-HY5 are two predominant signaling hubs that control the expression of a large number of light-responsive genes and subsequent light-mediated development in plants.In parallel,plants also transmit low or warm temperature signals to these two regulatory modules that precisely modulate the responsive-ness of low or warm temperatures.The core component of circadian clock ELF3 integrates signals from light and warm temperatures to regulate physiological and developmental processes in plants.In this review,we summarize and discuss recent advances and progresses on PIFs-,COP1-HY5-and ELF3-mediated light,low or warm temperature signaling,and highlight emerging insights regarding the interactions between light and low or warm temperature signal transduction pathways in the control of plant growth.展开更多
Phytochrome-interacting factors(PIFs)have been established as negative regulators of vascular patterning and xylem differentiation in the herbaceous plant Arabidopsis thaliana,however,the regulatory role of PIFs in se...Phytochrome-interacting factors(PIFs)have been established as negative regulators of vascular patterning and xylem differentiation in the herbaceous plant Arabidopsis thaliana,however,the regulatory role of PIFs in secondary growth in woody species remains unclear.Here,we examines the expression patterns and involvement of PtoPIF3.1 and PtoPIF3.2 during stem growth and secondary xylem development in Populus tomentosa.Overexpression of either PtoPIF3.1 or PtoPIF3.2 significantly enhances both longitudinal stem growth and radial wood development.Conversely,Ptopif3.1 and Ptopif3.2 mutants generated by CRISPR-mediated genome editing exhibit reciprocal phenotypic defects.Exogenous auxin application partially restores the phenotypes of Ptopif3.1 and Ptopif3.2 mutants,and the auxin biosynthesis-deficient mutant Ptoyuc8 exhibits developmental abnormalities similar to those observed in Ptopif3 mutants.Further analysis reveal that PtoPIF3s directly bind to and activate expression of PtoYUC8 and cell expansion-related genes PtoEXPA1.1/1.2,while modulating cambial division and expression of secondary xylem development marker genes(PtoWOX4,PtoANT,PtoCYCD3s,and PtoHB7/8)through auxin-mediated signaling.Together,our findings establish PtoPIF3.1/3.2 as key regulators that coordinate stem elongation and secondary growth in Populus,highlighting the functional divergence of PIF homologs between herbaceous and woody species.展开更多
Light is one of the most essential environmental factors that tightly and precisely control various physiological and developmental processes in plants.B-box CONTAINING PROTEINs(BBXs)play central roles in the regulati...Light is one of the most essential environmental factors that tightly and precisely control various physiological and developmental processes in plants.B-box CONTAINING PROTEINs(BBXs)play central roles in the regulation of light-dependent development.In this study,we report that BBX9 is a positive regulator of light signaling.BBX9 interacts with the red light photoreceptor PHYTOCHROME B(phyB)and transcription factors PHYTOCHROME-INTERACTING FACTORs(PIFs).phyB promotes the stabilization of BBX9 in light,while BBX9 inhibits the transcriptional activation activity of PIFs.In turn,PIFs directly bind to the promoter of BBX9 to repress its transcription.On the other hand,BBX9 associates with the positive regulator of light signaling,BBX21,and enhances its biochemical activity.BBX21 associates with the promoter regions of BBX9 and transcriptionally up-regulates its expression.Collectively,this study unveiled that BBX9 forms a negative feedback loop with PIFs and a positive one with BBX21 to ensure that plants adapt to fluctuating light conditions.展开更多
基金supported by the Fundamental Research Funds for the Central Universities(KJJQ2022002)the Natural Science Foundation of Jiangsu for Distinguished Young Scholars(BK20211525)+1 种基金the National Natural Science Foundation of China(31970258)the Jiangsu“Innovative and Entrepreneurial Talent”program(to D.X.),the Jiangsu Collaborative Innovation Center for Modern Crop Production(to D.X.)and the Nanjing Agricultural University(start-up funding to D.X.).
文摘Plants have to cope with the surrounding changing environmental stimuli to optimize their physiological and devel-opmental response throughout their entire life cycle.Light and temperature are two critical environmental cues that fluctuate greatly during day-night cycles and seasonal changes.These two external signals coordinately control the plant growth and development.Distinct spectrum of light signals are perceived by a group of wavelength-specific photoreceptors in plants.PIFs and COP1-HY5 are two predominant signaling hubs that control the expression of a large number of light-responsive genes and subsequent light-mediated development in plants.In parallel,plants also transmit low or warm temperature signals to these two regulatory modules that precisely modulate the responsive-ness of low or warm temperatures.The core component of circadian clock ELF3 integrates signals from light and warm temperatures to regulate physiological and developmental processes in plants.In this review,we summarize and discuss recent advances and progresses on PIFs-,COP1-HY5-and ELF3-mediated light,low or warm temperature signaling,and highlight emerging insights regarding the interactions between light and low or warm temperature signal transduction pathways in the control of plant growth.
基金upported by grants from the National Key Research and Development Program of China(2022YFD1201600)the National Natural Science Foundation of China(32371903).
文摘Phytochrome-interacting factors(PIFs)have been established as negative regulators of vascular patterning and xylem differentiation in the herbaceous plant Arabidopsis thaliana,however,the regulatory role of PIFs in secondary growth in woody species remains unclear.Here,we examines the expression patterns and involvement of PtoPIF3.1 and PtoPIF3.2 during stem growth and secondary xylem development in Populus tomentosa.Overexpression of either PtoPIF3.1 or PtoPIF3.2 significantly enhances both longitudinal stem growth and radial wood development.Conversely,Ptopif3.1 and Ptopif3.2 mutants generated by CRISPR-mediated genome editing exhibit reciprocal phenotypic defects.Exogenous auxin application partially restores the phenotypes of Ptopif3.1 and Ptopif3.2 mutants,and the auxin biosynthesis-deficient mutant Ptoyuc8 exhibits developmental abnormalities similar to those observed in Ptopif3 mutants.Further analysis reveal that PtoPIF3s directly bind to and activate expression of PtoYUC8 and cell expansion-related genes PtoEXPA1.1/1.2,while modulating cambial division and expression of secondary xylem development marker genes(PtoWOX4,PtoANT,PtoCYCD3s,and PtoHB7/8)through auxin-mediated signaling.Together,our findings establish PtoPIF3.1/3.2 as key regulators that coordinate stem elongation and secondary growth in Populus,highlighting the functional divergence of PIF homologs between herbaceous and woody species.
基金supported by the Natural Science Foundation of Jiangsu for Distinguished Young Scholars(BK20211525)the Fundamental Research Funds for the Central Universities(YDZX2024045)+3 种基金the National Natural Science Foundation of China(32270256)the Postdoctoral Fellowship Program of CPSF(GZB20240319)the Core Technology Development for Breeding Program of Jiangsu Province(JBGS‐2021‐014)the Jiangsu Collaborative Innovation Center for Modern Crop Production(to D.X.)。
文摘Light is one of the most essential environmental factors that tightly and precisely control various physiological and developmental processes in plants.B-box CONTAINING PROTEINs(BBXs)play central roles in the regulation of light-dependent development.In this study,we report that BBX9 is a positive regulator of light signaling.BBX9 interacts with the red light photoreceptor PHYTOCHROME B(phyB)and transcription factors PHYTOCHROME-INTERACTING FACTORs(PIFs).phyB promotes the stabilization of BBX9 in light,while BBX9 inhibits the transcriptional activation activity of PIFs.In turn,PIFs directly bind to the promoter of BBX9 to repress its transcription.On the other hand,BBX9 associates with the positive regulator of light signaling,BBX21,and enhances its biochemical activity.BBX21 associates with the promoter regions of BBX9 and transcriptionally up-regulates its expression.Collectively,this study unveiled that BBX9 forms a negative feedback loop with PIFs and a positive one with BBX21 to ensure that plants adapt to fluctuating light conditions.
