6 results on '"Xu, Xiaodong"'
Search Results
2. Circadian clock in plants: Linking timing to fitness.
- Author
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Xu, Xiaodong, Yuan, Li, Yang, Xin, Zhang, Xiao, Wang, Lei, and Xie, Qiguang
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CLOCK genes , *POST-translational modification , *CALCIUM ions , *CIRCADIAN rhythms , *GENETIC variation , *SPECIES diversity , *HISTONES - Abstract
Endogenous circadian clock integrates cyclic signals of environment and daily and seasonal behaviors of organisms to achieve spatiotemporal synchronization, which greatly improves genetic diversity and fitness of species. This review addresses recent studies on the plant circadian system in the field of chronobiology, covering topics on molecular mechanisms, internal and external Zeitgebers, and hierarchical regulation of physiological outputs. The architecture of the circadian clock involves the autoregulatory transcriptional feedback loops, post‐translational modifications of core oscillators, and epigenetic modifications of DNA and histones. Here, light, temperature, humidity, and internal elemental nutrients are summarized to illustrate the sensitivity of the circadian clock to timing cues. In addition, the circadian clock runs cell‐autonomously, driving independent circadian rhythms in various tissues. The core oscillators responds to each other with biochemical factors including calcium ions, mineral nutrients, photosynthetic products, and hormones. We describe clock components sequentially expressed during a 24‐h day that regulate rhythmic growth, aging, immune response, and resistance to biotic and abiotic stresses. Notably, more data have suggested the circadian clock links chrono‐culture to key agronomic traits in crops. [ABSTRACT FROM AUTHOR]
- Published
- 2022
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3. The nodulation and nyctinastic leaf movement is orchestrated by clock gene LHY in Medicago truncatula.
- Author
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Kong, Yiming, Han, Lu, Liu, Xiu, Wang, Hongfeng, Wen, Lizhu, Yu, Xiaolin, Xu, Xiaodong, Kong, Fanjiang, Fu, Chunxiang, Mysore, Kirankumar S., Wen, Jiangqi, and Zhou, Chuanen
- Subjects
MEDICAGO ,MEDICAGO truncatula ,CLOCK genes ,MOLECULAR clock ,CIRCADIAN rhythms ,SESSILE organisms ,ROOT-tubercles ,BIOLOGICAL rhythms - Abstract
As sessile organisms, plants perceive, respond, and adapt to the environmental changes for optimal growth and survival. The plant growth and fitness are enhanced by circadian clocks through coordination of numerous biological events. In legume species, nitrogen‐fixing root nodules were developed as the plant organs specialized for symbiotic transfer of nitrogen between microsymbiont and host. Here, we report that the endogenous circadian rhythm in nodules is regulated by MtLHY in legume species Medicago truncatula. Loss of function of MtLHY leads to a reduction in the number of nodules formed, resulting in a diminished ability to assimilate nitrogen. The operation of the 24‐h rhythm in shoot is further influenced by the availability of nitrogen produced by the nodules, leading to the irregulated nyctinastic leaf movement and reduced biomass in mtlhy mutants. These data shed new light on the roles of MtLHY in the orchestration of circadian oscillator in nodules and shoots, which provides a mechanistic link between nodulation, nitrogen assimilation, and clock function. [ABSTRACT FROM AUTHOR]
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- 2020
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4. COR27 and COR28 encode nighttime repressors integrating Arabidopsis circadian clock and cold response.
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Wang, Peng, Cui, Xuan, Zhao, Chunsheng, Shi, Liyan, Zhang, Guowei, Sun, Fenglong, Cao, Xiaofeng, Yuan, Li, Xie, Qiguang, and Xu, Xiaodong
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CIRCADIAN rhythms ,EFFECT of cold on plants ,ARABIDOPSIS thaliana genetics ,PROMOTERS (Genetics) ,PLANT genomes ,PLANTS - Abstract
It was noted that circadian components function in plant adaptation to diurnal temperature cycles and freezing tolerance. Our genome-wide transcriptome analysis revealed that evening-phased COR27 and COR28 mainly repress the transcription of clock-associated evening genes PRR5, ELF4 and cold-responsive genes. Chromatin immunoprecipitation indicated that CCA1 is recruited to the site containing EE elements of COR27 and COR28 promoters in a temperature-dependent way. Further genetic analysis shows COR28 is essential for the circadian function of PRR9 and PRR7. Together, our results support a role of COR27 and COR28 as nighttime repressors integrating circadian clock and plant cold stress responses. [ABSTRACT FROM AUTHOR]
- Published
- 2017
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5. SKIP Is a Component of the Spliceosome Linking Alternative Splicing and the Circadian Clock in Arabidopsis.
- Author
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Wang, Xiaoxue, Wu, Fangming, Xie, Qiguang, Wang, Huamei, Wang, Ying, Yue, Yanling, Gahura, Ondrej, Ma, Shuangshuang, Liu, Lei, Cao, Ying, Jiao, Yuling, Puta, Frantisek, McClung, C. Robertson, Xu, Xiaodong, and Ma, Ligeng
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CIRCADIAN rhythms ,ALTERNATIVE RNA splicing ,SPLICEOSOMES ,RNA metabolism ,CLOCK genes ,BIOLOGICAL rhythms ,GENETIC engineering - Abstract
Circadian clocks generate endogenous rhythms in most organisms from cyanobacteria to humans and facilitate entrainment to environmental diurnal cycles, thus conferring a fitness advantage. Both transcriptional and posttranslational mechanisms are prominent in the basic network architecture of circadian systems. Posttranscriptional regulation, including mRNA processing, is emerging as a critical step for clock function. However, little is known about the molecular mechanisms linking RNA metabolism to the circadian clock network. Here, we report that a conserved SNW/Ski-interacting protein (SKIP) domain protein, SKIP, a splicing factor and component of the spliceosome, is involved in posttranscriptional regulation of circadian clock genes in Arabidopsis thaliana. Mutation in SKIP lengthens the circadian period in a temperature-sensitive manner and affects light input and the sensitivity of the clock to light resetting. SKIP physically interacts with the spliceosomal splicing factor Ser/Arg-rich protein45 and associates with the pre-mRNA of clock genes, such as PSEUDORESPONSE REGULATOR7 (PRR7) and PRR9 , and is necessary for the regulation of their alternative splicing and mRNA maturation. Genome-wide investigations reveal that SKIP functions in regulating alternative splicing of many genes, presumably through modulating recognition or cleavage of 5′ and 3′ splice donor and acceptor sites. Our study addresses a fundamental question on how the mRNA splicing machinery contributes to circadian clock function at a posttranscriptional level. [ABSTRACT FROM AUTHOR]
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- 2012
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6. Complex epistatic interactions between ELF3, PRR9, and PRR7 regulate the circadian clock and plant physiology.
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Yuan, Li, Avello, Paula, Zhu, Zihao, Lock, Sarah C L, McCarthy, Kayla, Redmond, Ethan J, Davis, Amanda M, Song, Yang, Ezer, Daphne, Pitchford, Jonathan W, Quint, Marcel, Xie, Qiguang, Xu, Xiaodong, Davis, Seth J, and Ronald, James
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RESEARCH funding , *BIOLOGICAL rhythms , *CIRCADIAN rhythms , *GENETIC mutation , *PLANT physiology , *GENETICS - Abstract
Circadian clocks are endogenous timekeeping mechanisms that coordinate internal physiological responses with the external environment. EARLY FLOWERING3 (ELF3), PSEUDO RESPONSE REGULATOR (PRR9), and PRR7 are essential components of the plant circadian clock and facilitate entrainment of the clock to internal and external stimuli. Previous studies have highlighted a critical role for ELF3 in repressing the expression of PRR9 and PRR7. However, the functional significance of activity in regulating circadian clock dynamics and plant development is unknown. To explore this regulatory dynamic further, we first employed mathematical modeling to simulate the effect of the prr9/prr7 mutation on the elf3 circadian phenotype. These simulations suggested that simultaneous mutations in prr9/prr7 could rescue the elf3 circadian arrhythmia. Following these simulations, we generated all Arabidopsis elf3/prr9/prr7 mutant combinations and investigated their circadian and developmental phenotypes. Although these assays could not replicate the results from the mathematical modeling, our results have revealed a complex epistatic relationship between ELF3 and PRR9/7 in regulating different aspects of plant development. ELF3 was essential for hypocotyl development under ambient and warm temperatures, while PRR9 was critical for root thermomorphogenesis. Finally, mutations in prr9 and prr7 rescued the photoperiod-insensitive flowering phenotype of the elf3 mutant. Together, our results highlight the importance of investigating the genetic relationship among plant circadian genes. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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