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Targeting Proteins for Degradation by Arabidopsis COP1： Teamwork Is What Matters

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Journal of Integrative Plant Biology 2007年第1期49卷 35-42页

作者： rongcheng lin Haiyang Wang Boyce Thompson Institute for Plant Research Comell University Ithaca NY 14853 USA

Arsbidopsis COP1 （Constitutive Photomorphogenic 1） defines a key repressor of photomorphogenesis in darkness by acting as an E3 ubiquitin Iigase in the nucleus, and is responsible for the targeted degradation of a number of photomorphogenesis-promoting factors, including phyA, HY5, LAF1, and HFR1. Light activation of multiple classes of photoreceptors （including both phytochromes and cryptochromes） inactivates COP1 and reduces its nuclear abundance, allowing the accumulation of these positively acting light signaling intermediates to promote photomorphogenic development. Recent studies suggest that Arabidopsis COP1 teams up with a family of SPA proteins （SPA1-SPA4） to form the physiologically active COP1-SPA E3 ubiquitin ligase complexes. These COP1-SPA complexes play overlapping and distinct functions in regulating seedling photomorphogenesis under different light conditions and adult plant growth. Further, the COP1-SPA complexes act In concert at a biochemical level with the CDD （COP10, DET1, and DDB1） complex and COP9 signalosome （CSN） to orchestrate the repression of photomorphogenesis.

关键词： Arabidopsis COP1 E3 ligase photomorphogenesis proteolysis SPA

Chlorophyll a and primary production in the northeastern Pacific Ocean

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Acta Oceanologica Sinica 2008年第1期27卷 77-84页

作者： CHEN Xingqun lin rongcheng Third Institute of Oceanography State Oceanic Administration Xiamen 361005 China

The primary production and chlorophyll a concentration of picoplankton （0.2 - 2 μm） , nanoplankton （2 - 20μm） and micro- plankton （20 -200 μm） are described in the northeastern Pacific Ocean near the Hawaii Islands during the six survey cruises from 1996 to 2003：DY85-4, DY95-7, DY95-8, DY95-10, DY105-11 and DY105-12.14. The primary production of carbon was in range from 76.8 to 191.9 mg/（m^2 · d） with an average of 116.1 mg/（ m^2 · d） in the east region, and from 73.1 to 222.5 mg/（ m^2 · d） with an average of 127.1 mg/（ m^2 · d） in the west region, similar to the other oligotrophic regions of the Pacific Ocean investigated. The chlorophyll a concentration was about 0.1 mg/m^3 from the surface to the 50 m depth, about 0.2 -0.4 mg/m^3from 50 to 100 m, and gradually decreased below the 100 m depth. The picoplankton accounted for more than 70% of the total chlorophyll a in the upper layer （ surface to 125 m）, but it decreased to less than 50% in depth below 125 m. The nanoplankton and microplankton combined only accounted for less than 30% of the total chlorophyll a in the upper layer, but showed a more even vertical distribution.

关键词： northeastern Pacific Ocean chlorophyll a primary production

The role of light in regulating seed dormancy and germination^FA

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Journal of Integrative Plant Biology 2020年第9期62卷 1310-1326页

作者： Liwen Yang Shuangrong Liu rongcheng lin Key Laboratory of Photobiology Institute of Botanythe Chinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China CAS Center for Excel ence in Molecular Plant Sciences the Chinese Academy of SciencesBeijing 100093China

Seed dormancy is an adaptive trait in plants. Breaking seed dormancy determines the timing of ger-mination and is, thereby essential for ensuring plant sur-vival and agricultural production. Seed dormancy and the subsequent germination are controlled by both internal cues (mainly hormones) and environmental signals. In the past few years, the roles of plant hormones in regulating seed dormancy and germination have been uncovered. However, we are only beginning to understand how light signaling pathways modulate seed dormancy and inter-action with endogenous hormones. In this review, we summarize current views of the molecular mechanisms by which light controls the induction, maintenance and re-lease of seed dormancy, as well as seed germination, by regulating hormone metabolism and signaling pathways.

关键词： light germination metabolism

Green innovation for green light

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Science China(Life Sciences) 2023年第10期66卷 2443-2444页

作者： Junling Huai rongcheng lin Key Laboratory of Photobiology Institute of BotanyChinese Academy of SciencesBeijing 100093China

In darkness,plants undergo skotomorphogenesis,which is characterized by long hypocotyls and closed *** contrast,light,such as far-red light,red light,and blue light,inhibits hypocotyl *** sense different wavelengths o... 详细信息

关键词： light closed

PIF1 and RVE1 form a transcriptional feedback loop to control light-mediated seed germination in Arabidopsis^FA

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Journal of Integrative Plant Biology 2020年第9期62卷 1372-1384页

作者： Liwen Yang Zhimin Jiang Yanjun Jing rongcheng lin Key Laboratory of Photobiology Institute of BotanyChinese Academy of SciencesBeijing 100093China University of Chinese Academy of Sciences Beijing 100049China Institute of Botany CAS Center for Excellence in Molecular Plant SciencesChinese Academy of SciencesBeijing 100093China

The phytochrome B (phyB) photoreceptor plays a major role that inputs light signals to regulate seed dormancy and germination. PHYTOCHROME-INTERACTING FACTOR1 (PIF1) is a key transcription factor repressing phyB-mediated seed germination, while REVEILLE1 (RVE1) factor functions as a curial regulator in controlling both seed dormancy and ger-mination. However, the relationship between the PIF1-and RVE1-modulated signaling pathways remains mostly unknown. Here, we find that PIF1 physically interacts with RVE1. Genetic analysis indicates that RVE1 inhibition on seed germination requires PIF1;re-ciprocally, the repressive effect of PIF1 is partially de-pendent on RVE1. Strikingly, PIF1 and RVE1 directly bind to the promoter and activate the expression of each other. Furthermore, PIF1 and RVE1 coordinately regulate the transcription of many downstream genes involved in abscisic acid and gibberellin pathways. Moreover, PIF1 enhances the DNA-binding ability and transcriptional repression activity of RVE1 in regulating GIBBERELlin 3-OXIDASE2, and RVE1 promotes PIF1's DNA-binding ability in modulating ABSCISIC ACID-INSENSITIVE3 expression. Thus, this study demon-strates that PIF1 and RVE1 form a transcriptional feedback loop that coordinately inhibits seed germi-nation, providing a mechanistic understanding of how phyB-mediated light signal is transduced to the seeds.

关键词： expression. transcriptional light

Regulation of chloroplast protein degradation

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Journal of Genetics and Genomics 2023年第6期50卷 375-384页

作者： Yang Sun Jialong Li Lixin Zhang rongcheng lin State Key Laboratory of Crop Stress Adaptation and Improvement Schoolof Life SciencesHenan UniversityKaifengHenan 475001China Key Laboratory of Photobiology Institute of BotanyChinese Academy of SciencesBejing 100093China

Chloroplasts are unique organelles that not only provide sites for photosynthesis and many metabolic processes,but also are sensitive to various environmental *** proteins are encoded by genes from both nuclear and chloroplast *** chloroplast development and responses to stresses,the robust protein quality control systems are essential for regulation of protein homeostasis and the integrity of chloroplast *** this review,we summarize the regulatory mechanisms of chloroplast protein degradation refer to protease system,ubiquitin-proteasome system,and the chloroplast *** mechanisms symbiotically play a vital role in chloroplast development and photosynthesis under both normal or stress conditions.

关键词： Chloroplast Protein homeostasis Protease Ubiquitin-proteasome Chlorophagy

Amphipods fail to suppress the accumulation of Ulva lactuca biomass in eutrophic Yundang Lagoon

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Acta Oceanologica Sinica 2014年第12期33卷 155-162页

作者： ZHENG Xinqing HUANG lingfeng WANG Qian lin rongcheng Third Institute of Oceanography State Oceanic Administration Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems Xiamen University College of the Environment and Ecology Xiamen University China Ocean Press

The Gross growth efficiency （GGE） is defined as the amount of consumer carbon produced relative to the amount of prey ingested in a given time interval. In population ecology, it can be considered as an index for the ability of a consumer to convert the biomass of food into its population production. In this study, it was firstly applied to estimate the role of amphipods grazing in the biomass dynamics of macroalgae （Ulva lactuca） in Yundang Lagoon （a subtropical eutrophic coastal lagoon, Xiamen City, China）. It was found that amphipods were the dominant group （82.2%-98.7%） in the benthic assemblage, in which five amphipod species （Corophium uenoi, Ampithoe valida, Grandidierella japonica, Grammaropsis laevipalmata andCa-prella panantis） were observed in the lagoon. However, onlyA. valida significantly consumedU. lactuca among these amphipod species. A series of experiments were conducted to estimate the consumption of U. lactuca byA. valida. It was suggested that the monthly secondary production （P） ofA. valida using size frequency method ranged from 2.39 to 13.68 g/***. valida exponentially reduced with body size and was closely associated with water temperature. Therefore,GGE equation for different months using the temperature recorded during the field investigation was fitted. The monthly consumption ofU. lactuca was figured out to be 86.7-1 549.0 g/m2 by the sum of consumption （P/GGE） byA. valida at different size, ac-counting for 2.0%-37.5% ofU. lactucaproduction. It indicates that the grazing effect ofA. valida did play a role in reducingthe accumulation ofU. lactucabiomass whenA. valida was abundant, but it finally fails to limit the U. lactucagrowth in Yundang Lagoon. Low abundance of A. valida and high nutrient loading may be two major reasons for the outbreak ofU. lactuca bloom in the lagoon.

关键词： amphipods Ampithoe valida consumption gross growth efficiency secondary production,Ulva lactuca

The central circadian clock proteins CCA_1 and LHY regulate iron homeostasis in Arabidopsis

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Journal of Integrative Plant Biology 2019年第2期61卷 168-181页

作者： Gang Xu Zhimin Jiang Haiyang Wang rongcheng lin Key Laboratory of Photobiology Institute of Botany Chinese Academy of Sciences University of Chinese Academy of Sciences College of Life Sciences Shandong Agricultural University Institute of Genetics and Developmental Biology Chinese Academy of Sciences College of Life Sciences South China Agricultural University CAS Center for Excellence in Molecular Plant Sciences Chinese Academy of Sciences

Circadian clock is the endogenous timekeeping machinery that synchronizes an organism's metabolism, behavior, and physiology to the daily lightdark circles, thereby contributing to organismal ***(Fe) is an essential micronutrient for all organisms and it plays important roles in diverse processes of plant growth and development. Here, we show that, in Arabidopsis thaliana, loss of the central clock genes,CIRCADIAN CLOCK ASSOCIATED 1(CCA_1) and LATE ELONGATED HYPOCOTYL(LHY), results in both reduced Fe uptake and photosynthetic efficiency, whereas CCA_1 overexpression confers the opposite effects. We show that root Fe(III) reduction activity, and expression of FERRIC REDUCTION OXIDASE 2(FRO_2) and IRON-REGULATED TRANSPORTER 1(IRT_1) exhibit circadian oscillations, which are disrupted in the cca_1 lhy double mutant. Furthermore,CCA_1 directly binds to the specific regulatory regions of multiple Fe homeostasis genes and activates their expression. Thus, this study established that, in plants,CCA_1 and LHY function as master regulators that maintain cyclic Fe homeostasis.

关键词： CCA Fe

The SWi2/SNF2 Chromatin-Remodeling ATPase BRAHMA Regulates Chlorophyll Biosynthesis in Arabidopsis

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Molecular Plant 2017年第1期10卷 155-167页

作者： Dong Zhang Yuhong Li Xinyu Zhang Ping Zha rongcheng lin Key Laboratory of Photobiology CAS Center for Excellence in Molecular Plant Sciences Institute of Botany The Chinese Academy of Sciences Beijing 100093 China College of Life Sciences University of the Chinese Academy of Sciences Beijing 100049 China These authors contributed equally to this article

Chlorophyll biosynthesis is critical for chloroplast development and photosynthesis in plants. Although reactions in the chlorophyll biosynthetic pathway have been largely known, little is known about the regu-latory mechanisms of this pathway. In this study, we found that the dark-grown knockout and knockdown mutants as well as RNA-interference transgenic seedlings of BRAHMA （BRM）, which encodes an SWI2/ SNF2 chromatin-remodeling ATPase, had iligher greening rates, accumulated less protochlorophyllide, and produced less reactive oxygen species than Arabidopsis wild-type plants did upon light exposure. The expression of NADPH：protochlorophyilide oxidoreductase A （PORA）, PORB, and PORC, which catalyze a key step in chlorophyll biosynthesis, was increased in the brm mutants. We found that BRM physically interacted with the bHLH transcription factor PHYTOCHRONIE-iNTERACTING FACTOR 1 （PIF1） through its N-terminal domains. Furthermore, we demonstrated that BRM was directly recruited to the cis-regula-tory regions of PORC, but not of PORA and PORB, at least partially in a PIF1-dependent manner and the level of histone H3 lysine 4 tri-methylation （H3K4me3） at PORC loci was increased in the brm mutant. Taken together, our data indicate that the chromatino-remodeling enzyme BRM modulates PORC expression through interacting with PIF1, providing a novel regulatory mechanism by which plants fine-tune chloro-phyll biosynthesis during the transition from heterotrophic to autotrophic growth.

关键词： chromatin remodeling chlorophyll biosynthesis light signaling PIF1 PORC