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A Peroxidase Contributes to ROS Production during Arabidopsis Root Response to Potassium Deficiency

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molecular Plant 2010年第2期3卷 420-427页

作者： Min Jung Kim Silvano Ciani Daniel P. Schachtman Donald Danforth Plant Science Center 975 North Warson Road St Louis MO 63132 USA present address: Department of Biology Washington University in St Louis St Louis MO 63130 USA present address: Monsanto Company St Louis MO 63017 USA

Reactive oxygen species （ROS） play an important role in root responses to potassium deprivation by regulating the expression of the high-affinity K＋ transporter gene AtHAK5 and other genes. Activation-tagged lines of Arabidopsis plants containing the AtHAK5 promoter driving luciferase were screened for bioluminescence under potassium- sufficient conditions. A member of the type Ill peroxidase family, RCI3, was isolated and when it was overexpressed by the activation tag, this led to the enhanced expression of luciferase and the endogenous AtHAKS. RCI3 was found to be up- regulated upon potassium deprivation. Plants overexpressing RCI3 （RCI3-ox） showed more ROS production and AtHAK5 expression whereas the ROS production and AtHAK5 expression were reduced in rci3-1 under K＋-deprived conditions. These results suggested that RCI3 is involved in the production of ROS under potassium deprivation and that RCI3- mediated ROS production affects the regulation of AtHAK5 expression. This peroxidase appears to be another component of the low-potassium signal transduction pathway in Arabidopsis roots.

关键词： Abiotic/environmental stress nutrition signal transduction Arabidopsis ROS production peroxidase.

FAST W TRANSFORM——ALGORITHMS AND PROGRAMS

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Science China Mathematics 1989年第3期32卷 338-350页

作者：王中德 Beijing University of Posts & Telecommunications present address:Beijing University of Posts & Telecommunications.

The W transform is an approach to spectrum analysis in real domain. There are fourcommonly used types of the discrete W transform (DWT), all of which may be appliedto digital signal processing. In this paper, new fast algorithms for computing the fourtypes of the DWT are introduced. These algorithms are simple in structure and moreefficient than any other algorithms for the DWT. FORTRAN subroutines to realize thesealgorithms have been provided.

关键词： fast algorithm W transform spectral analysis.

Plasma Membrane Localization and Potential Endocytosis of Constitutively Expressed XA21 Proteins in Transgenic Rice

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molecular Plant 2010年第5期3卷 917-926页

作者： Fang Chen Ming-Jun Gao Yan-Song Miao Yue-Xing Yuan Mu-Yang Wang Qun Li Bi-Zeng Mao Li-Wen Jiang Zu-Hua He National Key Laboratory of Plant molecular Genetics Institute of Plant Physiology and Ecology Shanghai Institutes for Biological Sciences Chinese Academy of Sciences Shanghai 200032 China present address: Department of molecular Cellular and Developmental Biology Yale University New Haven CT 06511 USA Department of Biology and molecular Biotechnology Program The Chinese University of Hong Kong Shatin New Territories Hong Kong China present address: Department of Emergency Medicine Thomas Jefferson University Philadelphia PA 19107 USA Biotechnology Institute Zhejiang University Hanghzou 310029 China

The rice pattern recognition receptor （PRR） XA21 confers race-specific resistance in leaf infection by bacterial blight Xathornonas oryzae pv. oryzae （Xoo）, and was shown to be primarily localized to the endoplasmic reticulum （ER） when expressed with its native promoter or overexpressed in the protoplast. However, whether the protein is still ER- localization in the intact cell when overexpressed remains to be identified. Here, we showed that XA21, its kinase-dead mutant XA21PK736EP and the triple autophosphorylation mutant XA21PS686AJT688AJS699A GFP fusions were primarily localized to the plasma membrane （PM） when overexpressed in the intact transgenic rice cell, and also localized to the ER in the transgenic protoplast. The transgenic plants constitutively expressing the wild-type XA21 or its GFP fusion displayed racespecific resistance to Xoo at the adult and seedling stages. XA21 and XA21PK736EP could be internalized probably via the SCAMP-positive early endosomal compartment in the protoplast, suggesting that XA21 might be endocytosed to initiate resistance responses during pathogen infection. We also established a root infection system and demonstrated that XA21 also mediated race-specific resistance responses to Xoo in the root. Our current study provides an insight into the nature of the XA21-mediated resistance and a practical approach using the root cell system to further dissect the cellular signaling of the PRR during the rice-Xoo interaction.

关键词： Rice XA21 pattern recognition receptor bacterial bight cellular localization internalization root infection race-specific resistance.

SINGLE CRYSTAL HARDENING——MECHANISMS AND DESCRIPTION

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Acta Mechanica Sinica 1995年第2期11卷 162-167页

作者：孙守光黄克智 present address: Department of Mechanical Engineering Northern Jiaotong UniversityBeijing China 100044 Department of Engineering Mechanics Tsinghua University Beijing China 100084

Various work hardening mechanisms, on the basis of their characteristics, are classified into two categories: the pile-up hardening and the tangle hardening. Together with a discussion about the experimental investigations of work hardening, the descriptions for those two basic hardening mechanisms are suggested, respectively. Combining these descriptions, a new single crystal hardening law is proposed, which can be used to describe work hardening, particularly the cyclic hardening of a crystal grain in a polycrystalline material. Furthermore, some relevant discussion on the new single crystal hardening law is also made in this paper.

关键词： CRYSTAL PLASTICITY SINGLE CRYSTAL HARDENING CYCLIC HARDENING

Identification of Early Nuclear Target Genes of Plastidial Redox Signals that Trigger the Long- Term Response of Arabidopsis to Light Quality Sh∽ts

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molecular Plant 2015年第8期8卷 1237-1252页

作者： Lars Dietzel Christine Glaeer Monique Liebers Stefan Hiekel Florence Courtois Olaf Czarneckit Hagen Schlicke Yan Zubo Thomas Borner Klaus Mayer Bernhard Grimm Thomas Pfannschmidt Department of Plant Physiology Institute of General Botany and Plant Physiology Friedrich-Schiller-University of Jena Domburger Strasse 159 07743 JenaGermany MIPS/IBI Helmholtz Zentrum MGnchen German Research Center for Environmental Health (GmbH) Ingolst~dter Landstrasse 1 85764 Neuherberg Germany Institute of Biology/Plant Physiology Humboldt-University Berlin Philippstrasse 13 Building 12 10115 Berlin Germany Institute of Biology Genetics Humboldt-University Berlin Chausseestrasse 117 10115 Berlin Germany present address: Institut fer Molekulare Biowissenschaften Pflanzliche Zellphysiologie Max-von-Laue-Strasse 9 Biozentrum Goethe-Universit~t Frankfurt 60438Frankfurt am Main Germany present address: Zentrum fur Molekulare Biologie an der Universitat zu Heidelberg (ZMBH) Im Neuenheimer Feld 282 69120 Heidelberg Germany present address: Universite Grenoble-Alpes F-38000 Grenoble France present address: CNRS UMR5168 F-38054 Grenoble France present address: CEA iRTSV Laboratoire de Physiologie Cellulaire & Vgetale F-38054 Grenoble France present address: INRA USC1359 F-38054 Grenoble France present address: Plant Reproductive Biology Group Department of Physiology and Ceil-Biology Leibniz Institute of Rant Genetics and Crop Plant Research (IPK)OT Gatersleben Corrensstrasse 3 D-06466 Stadt Seeland Germany present address: KWS Saat AG Grimsehlstrasse 31 37555 Einbeck Germany present address: Dartmouth College Department of Biological Sciences Ufe Sciences Center 78 College Street Hanover NH 03755 USA

Natural illumination conditions are highly variable and because of their sessile life style, plants are forced to acclimate to them at the cellular and molecular level. Changes in light intensity or quality induce changes in the reduction/oxidation （redox） state of the photosynthetic electron chain that acts as a trigger for compen- satory acclimation responses comprising functional and structural adjustments of photosynthesis and metabolism. Such responses include redox-controlled changes in plant gene expression in the nucleus and organelles. Here we describe a strategy for the identification of early redox-regulated genes （ERGs） in the nucleus of the model organism Arabidopsis thaliana that respond significantly 30 or 60 min after the generation of a reduction signal in the photosynthetic electron transport chain. By comparing the response of wild-type plants with that of the acclimation mutant stn7, we could specifically identify ERGs. The results reveal a significant impact of chloroplast redox signals on distinct nuclear gene groups including genes for the mitochondrial electron transport chain, tetrapyrrole biosynthesis, carbohydrate metabolism, and signaling lipid synthesis. These expression profiles are clearly different from those observed in response to the reduction of photosynthetic electron transport by high light treatments. Thus, the ERGs identified are unique to redox imbalances in photosynthetic electron transport and were then used for analyzing potential redox-responsive cis-elements, trans-factors, and chromosomal regulatory hot spots. The data identify a novel redox-responsive element and indicate extensive redox control at transcriptional and chromosomal levels that point to an unprecedented impact of redox signals on epigenetic processes.

关键词： plastidial redox signaling,early redox-regulated gene Arabidopsis thaliana molecular Plant

THE DELAY OF TRANSITION OF A LAMINAR BOUNDARY LAYER OVER COMPLIANT WALL

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Acta Mechanica Sinica 1990年第1期6卷 15-21页

作者： Li Wanping Zhou Heng Tianjin University present address:Department of Mechanics Huazhong University of Science and TechnologyWuhan 430074

In a previous paper, a method has been developed to study the stability characteristics of laminar boundary layers over compliant walls. In this paper, the effect of double layered compliant wall and Kramer type compliant wall on delaying the transition is investigated, and it is shown that there does exist the possibility to de- lay the transition by applying such compliant walls.

关键词： transition compliant wall stability

How Sugars Might Coordinate Chloroplast and Nuclear Gene Expression during Acclimation to High Light Intensities

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molecular Plant 2014年第7期7卷 1121-1137页

作者： Rainer E. Haiusler Luisa Heinrichs Jessica Schmitz Ulf-Ingo Flugge Department of Botany II Cologne Biocenter University of Cologne ZuIpicherstr. 47b 50674 Cologne Germany present address: Plant molecular Physiology and Biotechnology Heinrich-Heine-University Universitatsstrasse 1 40225 D~sseldorfGermany

The concept of retrograde control of nuclear gene expression assumes the generation of signals inside the chloroplasts, which are either released from or sensed inside of the organelle. In both cases, downstream signaling path- ways lead eventually to a differential regulation of nuclear gene expression and the production of proteins required in the chloroplast. This concept appears reasonable as the majority of the over 3000 predicted plastidial proteins are encoded by nuclear genes. Hence, the nucleus needs information on the status of the chloroplasts, such as during acclimation responses, which trigger massive changes in the protein composition of the thylakoid membrane and in the stroma. Here, we propose an additional control mechanism of nuclear- and plastome-encoded photosynthesis genes, taking advantage of pathways involved in sugar- or hormonal signaling. Sugars are major end products of photosynthesis and their con- tents respond very sensitively to changes in light intensities. Based on recent findings, we ask the question as to whether the carbohydrate status outside the chloroplast can be directly sensed within the chloroplast stroma. Sugars might syn- chronize the responsiveness of both genomes and thereby help to coordinate the expression of piastome- and nuclear- encoded photosynthesis genes in concert with other, more specific retrograde signals.

关键词： acclimation--physiological assimilate allocation/partitioning carbohydrate metabolism molecular physiology membrane proteins Arabidopsis.

Sequence-Independent Identification of Active LTR Retrotransposons in Arabidopsis

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molecular Plant 2018年第3期11卷 508-511页

作者： Jayne,Griffiths Marco,Catoni Mayumi,Iwasaki Jerzy,Paszkowski The Sainsbury Laboratory University of Cambridge Cambridge UK [∗]Corresponding author present address: University of Geneva Geneva Switzerland

Dear Editor,LTR retrotransposons （LTR-TEs） are mobile genetic elements that often comprise a large portion of the host genome and are particularly abundant in genomes of plants （Lisch, 2013）. They transpose through an RNA transcript that is reverse transcribed to an extrachromosomal DNA （ecDNA） of the original element that can insert at a new genomic location （Wicker et al., 2007）.

关键词： Arabidopsis LTR 鉴定人染色体 DNA RNA 元素植物

Autoionizing Process of the Double Rydberg State

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Chinese Physics Letters 1995年第12期12卷 713-716页

作者： XU Chengbin XU Xiangyuan HUANG Wen XUE Ping ZHAO Runchuan ZHU Cheng CHEN Dieyan Department of Modern Applied Physics Tsinghua UniversityBeijing 100084 present address:Institute of Physics Academia SinicaBeijing 100080

Using five-laser resonance excitation and double time-of-flight spectroscopy,the double Rydberg states NLnl(N≤66;n≤85;L,1<4)of Ca have been *** distribution of Ca^(+)Rydberg states,which is from the autoionization o... 详细信息

关键词： Rydberg double excitation