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Transgenic expression of DwMYB2 impairs iron transport from root to shoot in Arabidopsis thaliana

cell Research 2006年第10期16卷 830-840页

作者： Yan-Hong Chen~(1,2,3) Xue-Min Wu~5 Hong-Qing Ling~4 Wei-Cai Yang~1 ~1The key laboratory of Molecular and developmental biology,institute of genetics and developmental biology,chinese academy of sciences,beijing 100101 china ~2Graduate University of the chinese academy of sciences,19 Yuquan Road,beijing 100049,china ~3School of Life Science,Nantong University,Nantong 226007 china ~4the state key laboratory of plant cell and chromosome engineering,institute of genetics and developmental biology,chinese academy of sciences,beijing 100101,china The key laboratory of Molecular and developmental biology Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China Graduate University of the chinese academy of sciences Beijing China School of Life Science Nantong University Nantong China Department of Botany University of British Columbia 6270 University Blvd. Vancouver Canada The state key laboratory of plant cell and chromosome engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China

In plant,iron uptake and homeostasis are tightly regulated to ensure its absorption from soil and to avoid excessiron in the *** genes involved in this process have been identified during past several years,but there are manyproblems remain unsolved in the genetic regulation of whole plant iron trafficking and *** transcriptionfactors contain tandem repeats of a～50 amino acid DNA-binding motif (R) and are involved in the regulation of manyaspects of plant development,hormone signaling and ***,we report that the ectopic expression of orchidR2R3-MYB gene DwMYB2 in Arabidopsis thaliana confers the transgenic plants hypersensitivity to iron *** DwMYB2 transgenic plants,the iron content in root is two-fold higher compared to that in wild-type root,while thereverse is true in *** imbalance of iron content in root and shoot suggested that the translocation of iron fromroot to shoot was affected by the expression of DwMYB2 in the transgenic ***,gene chip and reversetranscription-polymerase chain reaction analysis revealed that the ferric-chelate reductase gene,AtFRO2,and the irontransporter gene,AtIRT1 and AtIRT2,are up-regulated by DwMYB2 expression,while other potential iron transporterssuch as AtIREG1,AtFRD3 and NRAMP1 are *** addition,the expression of several putative peptidetransporters and transcription factors are also altered in the 35S::DwMYB2 transgenic *** data provide us insightinto the whole plant translocation of iron and identify candidate genes for iron homeostasis in plants despite the fact thata heterologous gene was expressed.

关键词： DwMYB2 iron uptake and homeostasis iron transporters Arabidopsis

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Utilization of blue-grained character in wheat breeding derived from Thinopyrum poticum

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Journal of genetics and Genomics 2009年第9期36卷 575-580页

作者： Qi Zheng, Bin Li, Hongwei Li, Zhensheng Li The state key laboratory of plant cell and chromosome engineering, institute of genetics and developmental biology, chinese academy of sciences, beijing 100101, china The state key laboratory of plant cell and chromosome engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing 100101 China

The blue grain trait in common wheat （Triticum aestivum L., 2n = 6x = 42, AABBDD）, which is caused by blue pigments in the aleurone layer, was originally derived from the tall wheatgrass （Thinopyrum ponticum Liu ＆ Wang = Agropyron elongatum, 2n = 10x = 70, StStStStEeEeEbEbEXEx） during chromosome engineering research. Over the last few decades, there have been continued interests in the genetic mechanism of this blue coloration and the practical utilization of the blue aleurone character as a phenotypic marker. This article reviews the research history and the recent progress of the studies on blue-grained wheat, with emphases on genetic and biochemical analysis and practical applications of blue-grained wheat.

关键词： Triticum aestivum Thinopyrum ponticum blue-grained character translocation

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Discovery of microchromosomes in wheat and their special behavior in meiosis

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chinese Science Bulletin 1997年第24期42卷 2084-2087页

作者： XU Qi, YU Ling, TIAN Zengrong, ZHU Jianfeng, LI Bin and LI Zhensheng laboratory of plant Genetic engineering and Breeding of Shaanxi Province, Northwestern institute of Botany, chinese academy of sciences, Yangling, Shaanxi 712100, china 2. state key laboratory of plant cell and chromosome engineering, institute of genetics, chinese academy of sciences, beijing 100101, china laboratory of plant Genetic engineering and Breeding of Shaanxi Province Northwestern Institute of Botany Chinese Academy of Sciences Yangling Shaanxi China state key laboratory of plant cell and chromosome engineering Institute of Genetics Chinese Academy of Sciences Beijing China

THERE are 42 chromosomes in common wheat (Triticum aestivum L). The extra microchro-mosomes were discovered in alloplasmic lines of common wheat with cytoplasms of Ae. muti-ca, Secale cereale, Elytrigia elongatum and Agropyron glaucum. The microchromo-somes were discovered in amphiploid of Triticum aestivum-Secale cereale (DDRR) too.

关键词： wheat microchromosomes behavior in meiosis.

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AtbHLH29 of Arabidopsis thaliana is a functional ortholog of tomato FER involved in controlling iron acquisition in strategy I plants

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cell Research 2005年第8期15卷 613-621页

作者： You Xi YUAN1,2, Juan ZHANG1,2, Dao Wen WANG1, Hong Qing LING1,* 1The state key laboratory of plant cell and chromosome engineering, institute of genetics and developmental biology, chinese academy of sciences, Datun Road, Chaoyang District, beijing 100101, china 2Graduate School of the chinese academy of sciences, Yuquan Road, Shijingshan District, beijing 100039, china The state key laboratory of plant cell and chromosome engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China Graduate School of the chinese academy of sciences Beijing China

AtbHLH29 of Arabidopsis, encoding a bHLH protein, reveals a high similarity to the tomato FER which is proposed as a transcriptional regulator involved in controlling the iron deficiency responses and the iron uptake in tomato. For identification of its biological functions, AtbHLH29 was introduced into the genome of the tomato FER mutant T3238fer mediated by Agrobacterium tumefaciencs. Transgenic plants were regenerated and the stable integration of AtbHLH29 into their genomes was confirmed by Southern hybridization. Molecular analysis demonstrated that expression of the exogenous AtbHLH29 of Arabidopsis in roots of the FER mutant T3238fer enabled to complement the defect functions of FER. The transgenic plants regained the ability to activate the whole iron deficiency responses and showed normal growth as the wild type under iron-limiting stress. Our transformation data demonstrate that AtbHLH29 is a functional ortholog of the tomato FER and can completely replace FER in controlling the effective iron acquisition in tomato. Except of iron, FER protein was directly or indirectly involved in manganese homeostasis due to that loss functions of FER in T3238fer resulted in strong reduction of Mn content in leaves and the defect function on Mn accumulation in leaves was complemented by expression of AtbHLH29 in the transgenic plants. Identification of the similar biological functions of FER and AtbHLH29, which isolated from two systematically wide-diverged “strategy I” plants, suggests that FER might be a universal gene presented in all strategy I plants in controlling effective iron acquisition system in roots.

关键词： tomato AtbHLH29 iron uptake Arabidopsis FER plant nutrition.

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LEAFY HEAD2,which encodes a putative RNA-binding protein,regulates shoot development of rice

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cell Research 2006年第3期16卷 267-276页

作者： Guo Sheng Xiong~(1,3) Xing Ming Hu~2 Yong Qing Jiao~1 Yan Chun Yu~1 Cheng Cai Chu~1 Jia Yang Li~1 Qian Qian~2 Yong Hong Wang~11 state key laboratory of plant Genomics and National Center for plant Gene Research,institute of genetics and developmental biology,chinese academy of sciences,beijing 100101,china 2 state key laboratory of Rice biology,china National Rice Research institute,chinese academy of Agricultural sciences,Hangzhou 310006,china 3 Graduate University of chinese academy of sciences,beijing 100049,china state key laboratory of plant Genomics and National Center for plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China Graduate University of chinese academy of sciences Beijing China state key laboratory of Rice biology China National Rice Research Institute Chinese Academy of Agricultural Sciences Hangzhou China

During vegetative development,higher plants continuously form new leaves in regular spatial and temporal *** with abnormal leaf developmental patterns not only provide a great insight into understanding the regulatorymechanism of plant architecture,but also enrich the ways to its modification by which crop yield could be ***,we reported the characterization of the rice leafy-head2 (lhd2) mutant that exhibits shortened plastochron,dwarfism,reduced tiller number,and failure of phase transition from vegetative to reproductive *** and histologicalstudy revealed that the rapid emergence of leaves in lhd2 was resulted from the rapid initiation ofleafprimordia whereasthe reduced tiller number was a consequence of the suppression of the tiller bud *** molecular and geneticanalysis showed that LHD2 encodes a putative RNA binding protein with 67% similarity to maize *** ofgenome-scale expression profiles between wild-type and lhd2 plants suggested that LHD2 may regulate rice shoot devel-opment through KNOXand hormone-related *** similar phenotypes caused by LHD2 mutation and the conservedexpression pattern of LHD2 indicated a conserved mechanism in controlling the temporal leaf initiation in grass.

关键词： phyllotaxy plastochron LHD2 RNA-binding protein stem elongation plant architecture Oryza sativa L

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BUD2,encoding an S-adenosylmethionine decarboxylase,is required for Arabidopsis growth and development

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cell Research 2006年第5期16卷 446-456页

作者： Chunmin Ge~(1,2,*) Xia Cui~(1,2,*) Yonghong Wang~1 Yuxin Hu~3 Zhiming Fu~1 Dongfen Zhang~(1,2) Zhukuan Cheng~1 Jiayang Li~1 ~1state key laboratory of plant Genomics and National Center for plant Gene Research,institute of genetics and developmental biology,chinese academy of sciences,beijing 100101,china ~2Graduate School,chinese academy of sciences,beijing 100101,china ~3institute of Botany,chinese academy of sciences,beijing 100093,china state key laboratory of plant Genomics and National Center for plant Gene Research Institute of Genetics and Developmental Biology Chinese Academy of Sciences Beijing China Graduate School Chinese Academy of Sciences Beijing China institute of Botany Chinese Academy of Sciences Beijing China

Polyamines are implicated in regulating various developmental processes in plants,but their exact roles and how theygovern these processes still remain *** report here an Arabidopsis bushy and dwarf mutant,bud2,which resultsfrom the complete deletion of one member of the small gene family that encodes S-adenosylmethionine decarboxylases(SAMDCs) necessary for the formation of the indispensable intermediate in the polyamine biosynthetic ***2 plant has enlarged vascular systems in inflorescences,roots,and petioles,and an altered homeostasis *** double mutant of bud2 and samdcl,a knockdown mutant of another SAMDC member,is embryo lethal,demonstrat-ing that SAMDCs are essential for plant *** results suggest that polyamines are required for the normalgrowth and development of higher plants.

关键词： BUD2 polyamines embryogenesis plant architecture Arabidopsis

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Molecular and functional characterization of sulfiredoxin homologs from higher plants

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cell Research 2006年第3期16卷 287-296页

作者： Xian Peng Liu~(1,2) Xue Ying Liu~(1,2) Juan Zhang~(1,2) Zong Liang Xia~(1,2) Xin Liu~1 Huan Ju Qin~1 Dao Wen Wang~11 The state key laboratory of plant cell and chromosome engineering,institute of genetics and developmental biology,chinese academy of sciences,Datun Road,Chaoyang District,beijing 100101,china 2 Graduate University of chinese academy of sciences,Yuquan Road,Shijingshan District,beijing 100039,china The state key laboratory of plant cell and chromosome engineering Institute of Genetics and Developmental Biology Chinese Academy of Sciences Chaoyang District China Graduate University of chinese academy of sciences Shijingshan District China

By reducing cysteine-sulfinic acid in oxidized peroxiredoxin,sulfiredoxin (Srx) plays an important role in oxidationstress resistance in yeast and human ***,we report the first molecular and functional characterization of Srxhomolog from higher *** analysis revealed the presence of potential Srx encoding sequences in bothmonocot and dicot plant *** plant Srx proteins exhibited significant identities to their orthologs from yeastand human,and contained the conserved signature sequence and residues essential for ***,unlike yeastand human orthologs,plant Srxs were all predicted to possess chloroplast transit peptide in their primary *** proteins from Arabidopsis and rice (designated as AtSrx and OsSrx,respectively) complemented functional defi-ciency of Srx in the SRXl deletion yeast cells.A GFP fusion protein of AtSrx was targeted to chloroplast in Arabidopsismesophyll *** transcription occurred in both vegetative and reproductive organs,and the highest transcriptlevel was detected in *** oxidation stress,AtSrx transcript level was substantially increased,which paralleledwith enhanced transcription of 2-Cys peroxiredoxins that have been found essential in maintaining chloroplast *** addition to oxidation stress,osmotic/water deficit or cold treatments also raised AtSrx transcript ***-sistent with above findings,the knock-out mutant of AtSrx was significantly more susceptible to oxidation stress thanwild type Arabidopsis *** together,the results of this work indicate the existence of functional Srx homolog inhigher plants that is essential for plants to cope with oxidation stress.

关键词： Arabidopsis sulfiredoxin chloroplast reactive oxygen species stress

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Molecular Regulation of Iron Uptake in Strategy I plants

Molecular Regulation of Iron Uptake in Strategy I Plants

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中国植物生理学会第九次全国会议

作者： LING Hong-Qing state key laboratory of plant cell and chromosome engineering institute of genetics and developmental biology, chinese academy of sciences, beijing 100101

＜正＞ Iron is an essential nutrition element for all organisms. It functions as acomponent of many important enzymes and proteins involved in fundamentallybiochemical processes. Iron deficiency causes anaemia afflicting more thanone third of the world population. In plants, iron is one of three most commonelements （N, P and Fe） limiting plant growth in the world because it existspredominantly in an oxidized ferric form [Fe（Ⅲ）] in aerobicenvironments. The ferric iron has an extremely low solubility at neutral orbasic pH and is not readily available to plants. To utilize iron elementsefficiently for growth and development, two effective iron acquisition systemsknown as strategy Ⅰand strategy Ⅱ（R?mheld and marschner,1986） have evolved in higher plants.

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genetics and Epigenetics of plant Centromeres

Genetics and Epigenetics of Plant Centromeres

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第十二届全国植物基因组学大会

作者： Fangpu Han state key laboratory of plant cell and chromosome engineering,institute of genetics and developmental biology,chinese academy of Science,beijing 100101,china

A high frequency of stable dicentric chromosomes was found from a centromere tug of war that linked together a large and a small B centromere by inactivation of the small *** inactive centromere can be transmitted from one generation to another by being attached to the larger active *** chromosome produced has a foldback structure so that it can recombine with *** recombination promotes reactivation of the inactive *** reactive process is specific to anaphase of meiosis *** reactivated centromere binds antibodies against CENH3 and CENPC,molecular correlates of

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Conditional and unconditional mapping of quantitative trait loci underlying plant height and tiller number in rice (Oryza sativa L.) grown at two nitrogen levels

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Progress in Natural Science:Materials International 2008年第12期18卷 1539-1547页

作者： Hua Jiang~(a,b) Liang Jiang~b Longbiao Guo~b Zhenyu Gao~b Dali Zeng~b Lihuang Zhu~c Guohua Liang~a Qian Qian~b a state key laboratory of Rice biology/key laboratory of plant Functional Genomies,Ministry of Education of china,Yangzhou University,Yangzhou 225009,china b state key laboratory of Rice biology,china National Rice Research institute,Hangzhou 310006,china c institute of genetics,chinese academy of sciences,beijing 100101,china state key laboratory of Rice biology/key laboratory of plant Functional Genomics Ministry of Education of China Yangzhou University Yangzhou 225009 China state key laboratory of Rice biology China National Rice Research Institute Hangzhou 310006 China institute of genetics Chinese Academy of Sciences Beijing 100101 China

In this study,we used 127 double haploid (DH) lines to analyze agricultural traits of *** DH lines,derived from a ZYQ8 (indica)/JX17 (japonica) cross by anther culture,contained 160 RFLP and 83 SSR *** and conditional quantitative trait loci (QTL) mapping was conducted to analyze plant height (PH) and tillers per plant (TP) at five growth stages that were grown at two nitrogen *** PH and 13 TP unconditional QTL were identified in the different growth stages,including 19 QTL from high-nitrogen (HN) and 14 QTL from low-nitrogen (LN) *** conditional QTL for 14 genomic regions under LN/HN con- ditions showed that there was a significant effect on PH and TP across the different *** one conditional QTL,ph2-3,was unable to be detected in unconditional *** QTL were detected in the first four rice growth stages than in the final ***- more,a line from the DH mapping population,DH78,was identified in extreme phenotypes of PH and TP that exhibited dwarfism and less-tiller (dft) *** gene dft1 was mapped to chromosome 2 using a backcrossed population of DH78/JX17 through a map- based cloning *** location of dft1 coincided with the mapping region of the small-LOD peak,QTL ph2 and tp2,which were identified in plants grown in low-nitrogen *** backcrossing and fine-mapping successfully delimited the dft1 locus to a 91 kb region.

关键词： Oryza sativa Quantitative trait loci Double haploid (DH) population developmental behavior Nitrogen Map-based cloning

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