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Coordination of Plastid and light signaling Pathways upon Development of Arabidopsis Leaves under Various Photoperiods

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Molecular Plant 2012年第4期5卷 799-816页

作者： Anna Lepisto Eevi Rintamaki Molecular Plant Biology Department of Biochemistry and Food Chemistry University of Turku FI-20014 Turku Finland

Plants synchronize their cellular and physiological functions according to the photoperiod （the length of the light period） in the cycle of 24 h. Photoperiod adjusts several traits in the plant life cycle, including flowering and senes- cence in annuals and seasonal growth cessation in perennials. Photoperiodic development is controlled by the coordinated action of photoreceptors and the circadian clock. During the past 10 years, remarkable progress has been made in under- standing the molecular mechanism of the circadian clock, especially with regard to the transition of Arabidopsis from the vegetative growth to the reproductive phase. Besides flowering photoperiod also modifies plant photosynthetic struc- tures and traits. light signals controlling biogenesis of chloroplasts and development of leaf photosynthetic structures are perceived both by photoreceptors and in chloroplasts. In this review, we provide evidence suggesting that the photope- riodic development of Arabidopsis leaves mimics the acclimation of plant to various light intensities. Furthermore, the chloroplast-to-nucleus retrograde signals that adjust acclimation to light intensity are proposed to contribute also to the signaling pathways that control photoperiodic acclimation of leaves.

关键词： acclimation chloroplast biology circadian clock leaf/vegetative development light signaling photomor-phogenesis plastid signaling.

BZS1, a B-box Protein, Promotes Photomorphogenesis Downstream of Both Brassinosteroid and light signaling Pathways

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Molecular Plant 2012年第3期5卷 591-600页

作者： Xi-Ying Fan Yu Sun Dong-Mei Cao Ming-Yi Bal Xiao-Min Luo Hong-Juan Yang Chuang-Qi Wei Sheng-Wei Zhu Ying Sun Kang Chonga Zhi-Yong Wang Institute of Botany Chinese Academy of Sciences Beijing 100093 China Institute of Molecular Cell Biology College of Life Science Hebei Normal University Shijiazhuang Hebei 050016 China Graduate School of the Chinese Academy of Sciences Beijing 100049 China Institute of Horticulture Shanxi Academy of Agriculture Sciences Shanxi 030031 China Department of Plant Biology Carnegie Institution for Science Stanford CA 94305 USA

Photomorphogenesis is controlled by multiple signaling pathways, including the light and brassinosteroid （BR） pathways. BR signaling activates the BZR1 transcription factor, which is required for suppressing photomorphogen- esis in the dark, We identified a suppressor of the BR hypersensitive mutant bzrl-lD and named it bzrl-lD suppressorl- Dominant （bzsl-D）. The bzsl-D mutation was caused by overexpression of a B-box zinc finger protein BZS1, which is transcriptionally repressed by BZR1. Overexpression of BZS1 causes de-etiolation in the dark, short hypocotyls in the light, reduced sensitivity to BR treatment, and repression of many BR-activated genes. Knockdown of BZS1 by co-suppression partly suppressed the short hypocotyl phenotypes of BR-deficient or insensitive mutants. These results support that BZSl is a negative regulator of BR response. BZS1 overexpressors are hypersensitive to different wavelengths of light and loss of function of BZS1 reduces plant sensitivity to light and partly suppresses the constitutive photomorphogenesis 1 （cop1） mutant in the dark, suggesting a positive role in light response. BZS1 protein accumulates at an increased level after light treatment of dark-grown BZSl-OXplants and in the cop1 mutants, and BZS1 interacts with COP1 in vitro, suggesting that light regulates BZS1 through COPl-mediated ubiquitination and proteasomal degradation. These results demonstrate that BZS1 mediates the crosstalk between BR and light pathways.

关键词： photomorphogenesis light signaling Brassinosteroid BZS1 Arabidopsis

BBX11 promotes red light-mediated photomorphogenic development by modulating phyB-PIF4 signaling

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aBIOTECH 2021年第2期2卷 117-130页

作者： Zhaoqing Song Yueqin Heng Yeting Bian Yuntao Xiao Jiujie Liu Xianhai Zhao Yan Jiang Xing Wang Deng Dongqing Xu State Key Laboratory of Crop Genetics and Germplasm Enhancement National Center for Soybean ImprovementCollege of AgricultureNanjing Agricultural UniversityNanjing 210095China Key Laboratory of Molecular Design for Plant Cell Factory of Guangdong Higher Education Institutes Institute of Plant and Food SciencesDepartment of BiologySchool of Life SciencesSouthern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Protein and Plant Gene Research Peking-Tsinghua Center for Life SciencesSchool of Advanced Agriculture Sciences and School of Life SciencesPeking UniversityBeijing 100871China Biology Department Brookhaven National LaboratoryUptonNY 11973USA

phytochrome B(phyB)acts as the red light photoreceptor and negatively regulates the growth-promoting factor PHYTOCHROME INTERACTING 4(PIF4)through a direct physical interaction,which in turn changes the expression of a large number of ***-PIF4 module regulates a variety of biological and developmental processes in *** this study,we demonstrate that B-BOX PROTEIN 11(BBX11)physically interacts with both phyB and ***11 negatively regulates PIF4 accumulation as well as its biochemical activity,consequently leading to the repression of PIF4-controlled genes’expression and promotion of photomorphogenesis in the prolonged red *** study reveals a regulatory mechanism that mediates red light signal transduction and sheds a light on phyB-PIF4 module in promoting red light-dependent photomorphognenesis.

关键词： phyB BBX PIF4 Photomorphogenesis light signaling

Phytochrome signaling： Time to Tighten up the Loose Ends

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Molecular Plant 2015年第4期8卷 540-551页

作者： Hai Wang Haiyang Wang Biotechnology Research Institute Chinese Academy of Agricultural Sciences Beijing 100081 China

Phytochromes are red and far-red light photoreceptors that play fundamental roles in controlling many aspects of plant growth and development in response to light. The past two decades have witnessed the mechanistic elucidation of the action mode of phytochromes, including their regulation by external and endogenous factors and how they exert their function as transcriptional regulators. More importantly, recent advances have substantially deepened our understanding on the integration of the phytochromemediated signal into other cellular and developmental processes, such as elongation of hypocotyls, shoot branching, circadian clock, and flowering time, which ofteninvolves complex intercellular and interorgan signaling. Based on these advances, this review illustrates a blueprint of our current understanding of phytochrome signaling and its crosstalk with other signaling pathways, and also points out still open questions that need to be addressed in the future.

关键词： light regulation light signaling cell signaling photomorphogenesis

Phytochrome signaling in Green Arabidopsis Seedlings： Impact Assessment of a Mutually Negative phyB-PIF Feedback Loop

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Molecular Plant 2012年第3期5卷 734-749页

作者： Pablo Leivar Elena Monte Megan M. Cohn Peter H. Quail Department of Plant and Microbial Biology University of California Berkeley CA 94720 USA United States Department of Agriculture Plant Gene Expression Center Albany CA 94710 USA Department of Molecular Genetics Center for Research in Agricultural Genomics （CRAG） CSIC-IRTA-UAB-UB Campus UAB Bellaterra （Cerdanyola del Valles） 08193 Barcelona Spain

The reversibly red （R）/far-red （FR）-Iight-responsive phytochrome （phy） photosensory system initiates both the deetiolation process in dark-germinated seedlings upon first exposure to light, and the shade-avoidance process in fully deetiolated seedlings upon exposure to vegetational shade. The intracellular signaling pathway from the light-activated photoreceptor conformer （Pfr） to the transcriptional network that drives these responses involves direct, physical inter- action of Pfr with a small subfamily of bHLH transcription factors, termed Phy-lnteracting Factors （PIFs）, which induces rapid PIF proteolytic degradation. In addition, there is evidence of further complexity in light-grown seedlings, whereby phyB-PIF interaction reciprocally induces phyB degradation, in a mutually-negative, feedback-loop configuration. Here, to assess the relative contributions of these antagonistic activities to the net phenotypic readout in light-grown seedlings, we have examined the magnitude of the light- and simulated-shade-induced responses of a pentuple phyBpiflpif3pif4pif5 （phyBpifq） mutant and various multiple pif-mutant combinations. The data （1） reaffirm that phyB is the predominant, if not exclusive, photoreceptor imposing the inhibition of hypocotyl elongation in deetiolating seedlings in response to pro- longed continuous R irradiation and （2） show that the PIF quartet （PIF1, PIF3, PIF4, and PIF5） retain and exert a dual capacity to modulate hypocotyl elongation under these conditions, by concomitantly promoting cell elongation through intrinsic transcriptional-regulatory activity, and reducing phyB-inhibitory capacity through feedback-loop-induced phyB degrada- tion. In shade-exposed seedlings, immunoblot analysis shows that the shade-imposed reduction in Pfr levels induces increases in the abundance of PIF3, and mutant analysis indicates that PIF3 acts, in conjunction with PIF4 and PIF5, to promote the known shade-induced acceleration of hypocotyl elongation. Conversel

关键词： light regulation light signaling genetics molecular biology transcriptional control and transcription fac- tors photomorphogenesis

PIFs‑and COP1‑HY5‑mediated temperature signaling in higher plants

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Stress Biology 2022年第1期2卷 270-283页

作者： Yeting Bian Li Chu Huan Lin Yaoyao Qi Zheng Fang Dongqing Xu State Key Laboratory of Crop Genetics and Germplasm Enhancement National Center for Soybean ImprovementCollege of AgricultureNanjing Agricultural UniversityNanjing 210095China

Plants have to cope with the surrounding changing environmental stimuli to optimize their physiological and devel-opmental response throughout their entire life *** and temperature are two critical environmental cues that fluctuate greatly during day-night cycles and seasonal *** two external signals coordinately control the plant growth and *** spectrum of light signals are perceived by a group of wavelength-specific photoreceptors in *** 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 *** parallel,plants also transmit low or warm temperature signals to these two regulatory modules that precisely modulate the responsive-ness of low or warm *** core component of circadian clock ELF3 integrates signals from light and warm temperatures to regulate physiological and developmental processes 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.

关键词： light signaling Low temperature Warm temperature phyB PIFs COP1 HY5 ELF3

Role of Arabidopsis RAP2.4 in Regulating light-and Ethylene-Mediated Developmental Processes and Drought Stress Tolerance

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Molecular Plant 2008年第1期1卷 42-57页

作者： Rong-Cheng Lin Hee-Jin Park Hai-Yang Wang Boyce Thompson Institute for Plant Research Cornell University Ithaca NY 14853 USA

light and the plant hormone ethylene regulate many aspects of plant growth and development in an overlapping and interdependent fashion. Little is known regarding how their signal transduction pathways cross-talk to regulate plant development in a coordinated manner. Here, we report functional characterization of an AP2/DREB-type transcription factor, Arabidopsis RAP2.4, in mediating light and ethylene signaling. Expression of the RAP2.4 gene is down-regulated by light but up-regulated by salt and drought stresses. RAP2.4 protein is constitutively targeted to the nucleus and it can bind to both the ethylene-responsive GCC-box and the dehydration-responsive element （DRE）. We show that RAP2.4 protein possesses an intrinsic transcriptional activation activity in yeast cells and that it can activate a reporter gene driven by the DRE cis-element in Arabidopsis protoplasts. Overexpression of RAP2.4 or mutation in RAP2.4 cause altered expression of representative light-, ethylene-, and drought-responsive genes. Although no salient phenotype was observed with a rap2.4 loss-of-function mutant, constitutive overexpression of RAP2.4 results in defects in multiple developmental processes regulated by light and ethylene, including hypocotyl elongation and gravitropism, apical hook formation and cotyledon expansion, flowering time, root elongation, root hair formation, and drought tolerance. Based on these observations, we propose that RAP2.4 acts at or downstream of a converging point of light and ethylene signaling pathways to coordinately regulate multiple developmental processes and stress responses.

关键词： RAP2.4 transcription factor light signaling ethylene response drought tolerance.

light Triggers the miRNA-Biogenetic Inconsistency for De-etiolated Seedling Survivability in Arabidopsis thaliana

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Molecular Plant 2020年第3期13卷 431-445页

作者： Suk Won Choi Moon Young Ryu Andras Viczian Hyun Ju Jung Gu Min Kim Agustin LArce Natalia PAchkar Pablo Manavella Ulla Dolde Stephan Wenke Attila Molnar Ferenc Nagy Seok Keun Cho Seong Wook Yang Department of Systems Biology Institute of Life Science and BiotechnologyYonsei UniversitySeoul 120-749Korea Institute of Plant Biology Biological Research Centre(BRC)Hungarian Academy of SciencesTemesvari krt.62Szeged 6726Hungary Instituto de Agrobiotecnologia del Litoral(IAL)Centro Cientifico Tecnologico Santa Fe(CCT) Santa FeArgentina Laboratoire de Recherche en Sciences Vegetates 24chemin de Borde-RougeBP 42617 AuzevilleCastanet-Tolosan 31326France Department of Plant and Environmental Sciences Faculty of ScienceUniversity of CopenhagenThorvaldsensvej 40FrederiksbergCopenhagen 1871Denmark Institute of Molecular Plant Sciences School of Biological SciencesThe King’s BuildingsUniversity of EdinburghEdinburgh EH93BFUK These authors contributed equally to this article

The shift of dark-grown seedlings into light causes enormous transcriptome changes followed by a dramatic developmental ***,we show that microRNA(miRNA)biogenesis also undergoes regulatory changes during *** seedlings maintain low levels of primary miRNAs(pri-miRNAs)and miRNA processing core proteins,such as Dicer-like 1,SERRATE,and HYPONASTIC LEAVES 1,whereas during de-etiolation both pri-miRNAs and the processing components accumulate to high ***,the levels of most miRNAs do not notably increase in response to *** reconcile this inconsistency,we demonstrated that an unknown suppressor decreases miRNA-processing activity and light-induced SMALL RNA DEGRADING NUCLEASE 1 shortens the half-life of several miRNAs in de-etiolated *** together,these data suggest a novel mechanism,miRNA-biogenetic inconsistency,which accounts for the intricacy of miRNA biogenesis during *** mechanism is essential for the survival of de-etiolated seedlings after long-term skotomorphogenesis and their optimal adaptation to ever-changing light conditions.

关键词： light signaling miRNA biogenesis

Photooligomerization Determines Photosensitivity and Photoreactivity of Plant Cryptochromes

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Molecular Plant 2020年第3期13卷 398-413页

作者： Qing Liu Tiantian Su Wenjin He Huibo Ren Siyuan Liu Yadi Chen Lin Gao Xiaohua Hu Haoyue Lu Shijiang Cao Ying Huang Xu Wang Qin Wang Chentao Lin Basic Forestry and Proteomics Research Center UCLA-FAFU Joint Research Center on Plant ProteomicsCollege of Life SciencesFujian Agriculture and Forestry UniversityFuzhou 350002China Department of Molecular Cell&Developmental BiologyUniversity of CaliforniaLos AngelesCA 90095USA College of Life Sciences Fujian Normal UniversityFuzhou 350108China College of Forestry Fujian Agriculture and Forestry UniversityFuzhou 350002China These authors contributed equally to this article.

Plant and non-plant species possess cryptochrome(CRY)photoreceptors to mediate blue light regulation of development or the circadian *** blue light-dependent homooligomerization of Arabidopsis CRY2 is a known early photoreaction necessary for its functions,but the photobiochemistry and function of light-dependent homooligomerization and heterooligomerization of cryptochromes,collectively referred to as CRY photooligomerization,have not been well ***,we show that photooligomerization is an evolutionarily conserved photoreaction characteristic of CRY photoreceptors in plants and some non-plant *** analyses of the kinetics of the forward and reverse reactions of photooligomerization of Arabidopsis CRY1 and CRY2 provide a previously unrecognized mechanism underlying the different photosensitivity and photoreactivity of these two closely related *** found that photooligomerization is necessary but not sufficient for the functions of CRY2,implying that CRY photooligomerization is presumably accompanied by additional function-empowering conformational *** further demonstrated that the CRY2-CRY1 heterooligomerization plays roles in regulating functions of Arabidopsis CRYs in *** together,these results suggest that photooligomerization is an evolutionarily conserved mechanism determining the photosensitivity and photoreactivity of plant CRYs.

关键词： light signaling photomorphogenesis cryptochrome,oligomerization