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Journal of Materials Science & Technology 2022年第35期130卷 35-43页

作者： Yongliang Li Haoxuan Sun Zhen Li Min Wang Linqi Guo Liangliang Min Fengren Cao Yeqiang Tan Liang Li State Key Laboratory of Bio-Fibers and Eco-Textiles&Institute of Marine Biobased Materials&Collage of Materials Science and Engineering Qingdao UniversityQingdao 266071China School of Physical Science and Technology Jiangsu Key Laboratory of Thin FilmsCenter for Energy Conversion Materials&Physics(CECMP)Soochow UniversitySuzhou 215006China

light regulation devices are essential for signal modulation, information encryption and energy-saving smart windows. Recently, due to their excellent stimuli-responsive properties, lead halide perovskites have shown great potential. However, the high transition temperature, irreversibility of the phase transition and toxicity of heavy metals make perovskite materials unsuitable for devices related to human activity. Herein, for the first time, a flexible perovskite nano-network is proposed and its application as a smart window is demonstrated. The perovskite-sodium alginate(SA) nano-network showed a 31.6 ℃(20% RH) transition temperature and stability over 1200 cycles. The hydrophobic surface and the “eggbox” structure formed by SA make that the lead leakage is only 2.569 ppb, which is much higher than the drinking water standard. This work provides a successful demonstration for energy-efcient buildings and inspires future nontoxic perovskite-based devices through heavy metal control.

关键词： Sodium alginate Perovskite Phase transition Thermochromism light regulation

Emerging Perspectives on the Mechanisms, regulation, and Distribution of light Color Acclimation in Cyanobacteria

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Molecular Plant 2012年第1期5卷 1-13页

作者： Andrian Gutu David M. Kehoe Department of Biology 1001 East Third Street indiana University Bloomington iN 47405 USA Present address： HoWard Hughes Medical Institute/Department Of Molecular and Cellular Biology FAS Center for Systems Biology Harvard UniversityCambridge MA 02138 USA

Chromatic acclimation （CA） provides many cyanobacteria with the ability to tailor the properties of their light-harvesting antennae to the spectral distribution of ambient light. CA was originally discovered as a result of its dramatic cellular phenotype in red and green light. However, discoveries over the past decade have revealed that many pairs of light colors, ranging from blue to infrared, can trigger CA responses. The capacity to undergo CA is widespread geographically, occurs in most habitats around the world, and is found within all major cyanobacterial groups. In addition, many other cellular activities have been found to be under CA control, resulting in distinct physiological and morphological states for cells under different light-color conditions. Several types of CA appear to be the result of convergent evolution, where different strategies are used to achieve the final goal of optimizing light-harvesting antenna composition to maximize photon capture. The regulation of CA has been found to occur primarily at the level of RNA abundance. The CA-regulatory pathways uncovered thus far are two-component systems that use phytochrome-class photoreceptors with sensor-kinase domains to control response regulators that function as transcription factors. However, there is also at least one CA- regulatory pathway that operates at the post-transcriptional level. It is becoming increasingly clear that large numbers of cyanobacterial species have the capacity to acclimate to a wide variety of light colors through the use of a range of different CA processes.

关键词： Chromatic adaptation phycobilisome cyanobacteria light regulation gene regulation signal transduction light harvesting phenotypic plasticity.

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. Conversely, although the quadruple pifq mutant displays c

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

Histone Acetyltransferase AtGCN5/HAG1 Is a Versatile Regulator of Developmental and Inducible Gene Expression in Arabidopsis

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Molecular Plant 2010年第4期3卷 670-677页

作者： Caroline Servet Natalia Conde e Silva Dao-Xiu Zhou Institut de Biologie des Plantes Universite Paris-sud 11 91405 Orsay France

Histone acetylation/deacetylation is a dynamic process and plays an important role in gene regulation. Histone acetylation homeostasis is regulated by antagonist actions of histone acetyltransferases （HAT） and deacetylases （HDAC）. Plant genome encodes multiple HATs and HDACs. The Arabidopsis HAT gene AtGCNS/HAGlplays an essential role in many plant development processes, such as meristem function, cell differentiation, leaf and floral organogenesis, and responses to environmental conditions such as light and cold, indicating an important role of this HAT in the regulation of both long-term developmental switches and short-term inducible gene expression. AtGCN5 targets to a large number of promoters and is required for acetylation of several histone H3 lysine residues. Recruitment of AtGCN5 to target promoters is likely to be mediated by direct or indirect interaction with DNA-binding transcription factors and/or by interaction with acetylated histone lysine residues on the targets. Interplay between AtGCN5 and other HATand HDAC is demonstrated to control specific regulatory pathways. Analysis of the role of AtGCN5 in light-inducible gene expression suggests a function of AtGCN5 in preparing chromatin commitment for priming inducible gene activation in plants.

关键词： light regulation chromatin structure and remodeling gene regulation leaf/vegetative development meristem development.

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

The Blue light-Dependent Phosphorylation of the CCE Domain Determines the Photosensitivity of Arabidopsis CRY2

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Molecular Plant 2015年第4期8卷 631-643页

作者： Qin Wang William D. Barshop Mingdi Bian Ajay A. Vashisht Reqing He Xuhong Yu Bin Liu Paula Nguyen Xuanming Liu Xiaoying Zhao James A. Wohlschlegel Chentao Lin Basic Forestry and Proteomics Research Center Fujian Agriculture and Forestry University Fuzhou China Hunan Province Key Laboratory of Plant Functional Genomics and Developmental regulation College of Biology Hunan University Changsha 410082 China Department of Biological Chemistry University of California Los Angeles CA 90095 USA Laboratory of Soil and Plant Molecular Genetics College of Plant Science Jilin University Changchun 130062 China Institute of Crop Science Chinese Academy of Agricultural Sciences Beijing 100081 China Department of Molecular Cell & Developmental Biology University of California Los Angeles CA 90095 USA Department of Biology Indiana University Bloomington IN 47405 USA

Arabidopsis cryptochrome 2 （CRY2） is a blue light receptor that mediates light inhibition of hypocotyl elongation and long-day promotion of floral initiation, CRY2 is known to undergo blue light-dependent phosphorylation, which is believed to serve regulatory roles in the function of CRY2. We report here on a biochemical and genetics study of CRY2 phosphorylation. Using mass spectrometry analysis, we identified three serine residues in the CCE domain of CRY2 （S588, S599, and S605） that undergo blue light-dependent phosphorylation in Arabidopsis seedlings. A study of serine-substitution mutations in the CCE domain of CRY2 demonstrates that CRY2 contains two types of phosphorylation in the CCE domain, one in the serine cluster that causes electrophoretic mobility upshift and the other outside the serine cluster that does not seem to cause mobility upshift. We showed that mutations in the serine residues within and outside the serine cluster diminished blue light-dependent CRY2 phosphorylation, degradation, and physiological activities. These results support the hypothesis that blue light-dependent phosphorylation of the CCE domain determines the photosensitivity of Arabidopsis CRY2.

关键词： light regulation light signaling physiology of plant growth Arabidopsis

Prompt and Easy Activation by Specific Thioredoxins of Calvin Cycle Enzymes of Arabidopsis thaliana Associated in the GAPDH/CP12/PRK Supramolecular Complex

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Molecular Plant 2009年第2期2卷 259-269页

作者： Lucia Marri Mirko Zaffagnini Valerie Collin Emmanuelle Issakidis-Bourguet Stephane D. Lemaire Paolo Pupillo Francesca Sparla Myroslawa Miginiac-Maslow Paolo Trost Laboratory of Molecular Plant Physiology Department of Experimental Evolutionary Biology University of Bologna Via Irnerio 42 1-40126 Bologna Italy Institut de Biotechnologie des Plantes UMR 8618 CNRS/Univ. Paris-Sud 1 1 91405 Orsay Cedex France

The Calvin cycle enzymes glyceraldehyde-3-phosphate dehydrogenase （GAPDH） and phosphoribulokinase （PRK） can form under oxidizing conditions a supramolecular complex with the regulatory protein CP12. Both GAPDH and PRK activities are inhibited within the complex, but they can be fully restored by reduced thioredoxins （TRXs）. We have investigated the interactions of eight different chloroplast thioredoxin isoforms （TRX f1, m1, m2, m3, m4, y1, y2, x） with GAPDH （A4, B4, and B8 isoforms）, PRK and CP12 （isoform 2）, all from Arabidopsis thaliana. In the complex, both A4-GAPDH and PRK were promptly activated by TRX f1, or more slowly by TRXs ml and m2, but all other TRXs were ineffective. Free PRK was regulated by TRX f1, m1, or m2, while B4- and Bs-GAPDH were absolutely specific for TRX fl. Interestingly, reductive activation of PRK caged in the complex was much faster than reductive activation of free oxidized PRK, and activation of A4-GAPDH in the complex was much faster （and less demanding in terms of reducing potential） than activation of free oxidized B4- or BB-GAPDH. It is proposed that CP12-assembled supramolecular complex may represent a reservoir of inhibited enzymes ready to be released in fully active conformation following reduction and dissociation of the complex by TRXs upon the shift from dark to low light. On the contrary, autonomous redox-modulation of GAPDH （B- containing isoforms） would be more suited to conditions of very active photosynthesis.

关键词： carbon metabolism enzymology light regulation metabolic regulation photosynthesis Arabidopsis.

Arabidopsis Thylakoid Formation 1 Is a Critical Regulator for Dynamics of PSII-LHCII Complexes in Leaf Senescence and Excess light

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Molecular Plant 2013年第5期6卷 1673-1691页

作者： Weihua Huang Qingbo Chen Ying Zhu Fenghong Hu Lingang Zhang Zhaoxue Ma Zuhua He Jirong Huang National Key Laboratory of Plant Molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences 300 Fenglin Road Shanghai 200032 China

In higher plants, photosystem II （PSII） is a large pigment-protein supramolecular complex composed of the PSII core complex and the plant-specific peripheral light-harvesting complexes （LHCil）. PSli-LHCII complexes are highly dynamic in their quantity and macro-organization to various environmental conditions. In this study, we reported a critical factor, the Arabidopsis Thylakoid Formation 1 （THF1） protein, which controls PSII-LHCII dynamics during dark- induced senescence and light acclimation. Loss-of-function mutations in THF1 lead to a stay-green phenotype in path- ogen-infected and senescent leaves. Both LHCII and PSll core subunits are retained in dark-induced senescent leaves of thfl, indicative of the presence of PSII-LHCII complexes. Blue native （BN）-polyacrylamide gel electrophoresis （PAGE） and immunoblot analysis showed that, in dark- and high-light-treated thfl leaves, a type of PSII-LHCII megacomplex is selec- tively retained while the stability of PSII-LHCII supercomplexes significantly decreased, suggesting a dual role of THF1 in dynamics of PSII-LHCII complexes. We showed further that THF1 interacts with Lhcb proteins in a pH-dependent manner and that the stay-green phenotype of thfl relies on the presence of LHCII complexes. Taken together, the data suggest that THF1 is required for dynamics of PSII-LHCII supramolecular organization in higher plants.

关键词： light regulation photosynthesis physiology of plant growth Arabidopsis.