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  1 / 202 MEDLINE  
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[PMID]:28771591
[Au] Autor:Zhou Y; Wang Y; Zhu X; Liu R; Xiang P; Chen J; Liu X; Duan Y; Chen L
[Ad] Endereço:Nematology Institute of Northern China, Shenyang Agricultural University, Shenyang, Liaoning, China.
[Ti] Título:Management of the soybean cyst nematode Heterodera glycines with combinations of different rhizobacterial strains on soybean.
[So] Source:PLoS One;12(8):e0182654, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Soybean cyst nematode (SCN) is the most damaging soybean pest worldwide. To improve soybean resistance to SCN, we employed a soybean seed-coating strategy through combination of three rhizobacterial strains, including Bacillus simple, B. megaterium and Sinarhizobium fredii at various ratios. We found seed coating by such rhizobacterial strains at a ratio of 3:1:1 (thereafter called SN101) produced the highest germination rate and the mortality of J2 of nematodes. Then, the role of soybean seed coating by SN101 in nematode control was evaluated under both greenhouse and two field conditions in Northeast China in 2013 and 2014. Our results showed that SN101 treatment greatly reduced SCN reproduction and significantly promoted plant growth and yield production in both greenhouse and field trials, suggesting that SN101 is a promising seed-coating agent that may be used as an alternative bio-nematicide for controlling SCN in soybean fields. Our findings also demonstrate that combination of multiple rhizobacterial strains needs to be considered in the seed coating for better management of plant nematodes.
[Mh] Termos MeSH primário: Bacillus/fisiologia
Doenças das Plantas/prevenção & controle
Sinorhizobium/fisiologia
Feijão de Soja/crescimento & desenvolvimento
Tylenchoidea/fisiologia
[Mh] Termos MeSH secundário: Animais
China
Resistência à Doença
Germinação
Controle Biológico de Vetores/métodos
Doenças das Plantas/parasitologia
Plântulas/crescimento & desenvolvimento
Feijão de Soja/microbiologia
Feijão de Soja/parasitologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170829
[Lr] Data última revisão:
170829
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170804
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0182654


  2 / 202 MEDLINE  
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[PMID]:28700717
[Au] Autor:Ogden AJ; Gargouri M; Park J; Gang DR; Kahn ML
[Ad] Endereço:Molecular Plant Science Program, Washington State University, Pullman, Washington, United States of America.
[Ti] Título:Integrated analysis of zone-specific protein and metabolite profiles within nitrogen-fixing Medicago truncatula-Sinorhizobium medicae nodules.
[So] Source:PLoS One;12(7):e0180894, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Symbiotic nitrogen fixation (SNF) between rhizobia and legumes requires metabolic coordination within specialized root organs called nodules. Nodules formed in the symbiosis between S. medicae and barrel medic (M. truncatula) are indeterminate, cylindrical, and contain spatially distinct developmental zones. Bacteria in the infection zone II (ZII), interzone II-III (IZ), and nitrogen fixation zone III (ZIII) represent different stages in the metabolic progression from free-living bacteria into nitrogen fixing bacteroids. To better understand the coordination of plant and bacterial metabolism within the nodule, we used liquid and gas chromatography coupled to tandem mass spectrometry (MS) to observe protein and metabolite profiles representative of ZII, IZ, ZIII, whole-nodule, and primary root. Our MS-based approach confidently identified 361 S. medicae proteins and 888 M. truncatula proteins, as well as 160 metabolites from each tissue. The data are consistent with several organ- and zone-specific protein and metabolite localization patterns characterized previously. We used our comprehensive dataset to demonstrate how multiple branches of primary metabolism are coordinated between symbionts and zones, including central carbon, fatty acid, and amino acid metabolism. For example, M. truncatula glycolysis enzymes accumulate from zone I to zone III within the nodule, while equivalent S. medicae enzymes decrease in abundance. We also show the localization of S. medicae's transition to dicarboxylic acid-dependent carbon metabolism within the IZ. The spatial abundance patterns of S. medicae fatty acid (FA) biosynthesis enzymes indicate an increased demand for FA production in the IZ and ZIII as compared to ZI. These observations provide a resource for those seeking to understand coordinated physiological changes during the development of SNF.
[Mh] Termos MeSH primário: Medicago truncatula/metabolismo
Nitrogênio/metabolismo
Raízes de Plantas/microbiologia
[Mh] Termos MeSH secundário: Ácidos Graxos/metabolismo
Regulação da Expressão Gênica de Plantas/fisiologia
Fixação de Nitrogênio/fisiologia
Nódulos Radiculares de Plantas
Sinorhizobium/metabolismo
Espectrometria de Massas em Tandem
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Fatty Acids); N762921K75 (Nitrogen)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171014
[Lr] Data última revisão:
171014
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170713
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0180894


  3 / 202 MEDLINE  
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[PMID]:27935141
[Au] Autor:Tian R; Heiden S; Osman WA; Ardley JK; James EK; Gollagher MM; Tiwari R; Seshadri R; Kyrpides NC; Reeve WG
[Ad] Endereço:School of Veterinary and Life Sciences, Murdoch University, Murdoch, WA, 6150, Australia.
[Ti] Título:Evolution of a multi-step phosphorelay signal transduction system in Ensifer: recruitment of the sigma factor RpoN and a novel enhancer-binding protein triggers acid-activated gene expression.
[So] Source:Mol Microbiol;103(5):829-844, 2017 Mar.
[Is] ISSN:1365-2958
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Most Ensifer strains are comparatively acid sensitive, compromising their persistence in low pH soils. In the acid-tolerant strain Ensifer medicae WSM419, the acid-activated expression of lpiA is essential for enhancing survival in lethal acidic conditions. Here we characterise a multi-step phosphorelay signal transduction pathway consisting of TcsA, TcrA, FsrR, RpoN and its cognate enhancer-binding protein EbpA, which is required for the induction of lpiA and the downstream acvB gene. The fsrR, tcrA, tcsA and rpoN genes were constitutively expressed, whereas lpiA and acvB were strongly acid-induced. RACE mapping revealed that lpiA/acvB were co-transcribed as an operon from an RpoN promoter. In most Ensifer species, lpiA/acvB is located on the chromosome and the sequence upstream of lpiA lacks an RpoN-binding site. Nearly all Ensifer meliloti strains completely lack ebpA, tcrA, tcsA and fsrR regulatory loci. In contrast, E. medicae strains have lpiA/acvB and ebpA/tcrA/tcsA/fsrR co-located on the pSymA megaplasmid, with lpiA/acvB expression coupled to an RpoN promoter. Here we provide a model for the expression of lpiA/acvB in E. medicae. This unique acid-activated regulatory system provides insights into an evolutionary process which may assist the adaptation of E. medicae to acidic environmental niches.
[Mh] Termos MeSH primário: Proteínas de Ligação a DNA/metabolismo
Evolução Molecular
Regulação Bacteriana da Expressão Gênica
Fator sigma/metabolismo
Sinorhizobium/genética
Sinorhizobium/metabolismo
[Mh] Termos MeSH secundário: Ácidos
Animais
Sítios de Ligação
DNA Bacteriano/genética
Proteínas de Ligação a DNA/genética
Genes Bacterianos
Fixação de Nitrogênio
Regiões Promotoras Genéticas
Fator sigma/genética
Transdução de Sinais
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acids); 0 (DNA, Bacterial); 0 (DNA-Binding Proteins); 0 (Sigma Factor)
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170828
[Lr] Data última revisão:
170828
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161210
[St] Status:MEDLINE
[do] DOI:10.1111/mmi.13592


  4 / 202 MEDLINE  
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[PMID]:27797963
[Au] Autor:Romaniuk K; Dziewit L; Decewicz P; Mielnicki S; Radlinska M; Drewniak L
[Ad] Endereço:Department of Bacterial Genetics, Institute of Microbiology, Faculty of Biology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland.
[Ti] Título:Molecular characterization of the pSinB plasmid of the arsenite oxidizing, metallotolerant Sinorhizobium sp. M14 - insight into the heavy metal resistome of sinorhizobial extrachromosomal replicons.
[So] Source:FEMS Microbiol Ecol;93(1), 2017 Jan 01.
[Is] ISSN:1574-6941
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Sinorhizobium sp. M14 is an As(III)-oxidizing, psychrotolerant strain, capable of growth in the presence of extremely high concentrations of arsenic and many other heavy metals. Metallotolerant abilities of the M14 strain depend upon the presence of two extrachromosomal replicons: pSinA (∼ 109 kb) and pSinB (∼ 300 kb). The latter was subjected to complex analysis. The performed analysis demonstrated that the plasmid pSinB is a narrow-host-range repABC-type replicon, which is fully stabilized by the phd-vapC-like toxin-antitoxin stabilizing system. In silico analysis showed that among the phenotypic gene clusters of the plasmid pSinB, eight modules are potentially involved in heavy metals resistance (HMR). These modules carry genes encoding efflux pumps, permeases, transporters and copper oxidases, which provide resistance to arsenic, cadmium, cobalt, copper, iron, mercury, nickel, silver and zinc. The functional analysis revealed that the HMR modules are active and have an effect on the minimal inhibitory concentration (MIC) values observed for the heterological host cells. The phenotype was manifested by an increase or decrease of the MICs of heavy metals and it was strain specific. The analysis of distribution of the heavy metal resistance genes, i.e. resistome, in Sinorhizobium spp. plasmids, revealed that the HMR modules are common in these replicons.
[Mh] Termos MeSH primário: Arsênico/metabolismo
Metais Pesados/metabolismo
Sinorhizobium/metabolismo
[Mh] Termos MeSH secundário: Arsênico/toxicidade
Arsenitos/metabolismo
Biodegradação Ambiental
Biotransformação
Farmacorresistência Bacteriana
Metais Pesados/toxicidade
Testes de Sensibilidade Microbiana
Plasmídeos/genética
Replicon
Sinorhizobium/efeitos dos fármacos
Sinorhizobium/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Arsenites); 0 (Metals, Heavy); N5509X556J (arsenite); N712M78A8G (Arsenic)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170515
[Lr] Data última revisão:
170515
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161101
[St] Status:MEDLINE
[do] DOI:10.1093/femsec/fiw215


  5 / 202 MEDLINE  
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[PMID]:27756732
[Au] Autor:Yoder JB
[Ad] Endereço:Department of Forest and Conservation Sciences, University of British Columbia, Vancouver, British Columbia V6T 1Z4 Canada jbyoder@mail.ubc.ca.
[Ti] Título:Understanding the coevolutionary dynamics of mutualism with population genomics.
[So] Source:Am J Bot;103(10):1742-1752, 2016 Oct.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Decades of research on the evolution of mutualism has generated a wealth of possible ways whereby mutually beneficial interactions between species persist in spite of the apparent advantages to individuals that accept the benefits of mutualism without reciprocating - but identifying how any particular empirical system is stabilized against cheating remains challenging. Different hypothesized models of mutualism stability predict different forms of coevolutionary selection, and emerging high-throughput sequencing methods allow examination of the selective histories of mutualism genes and, thereby, the form of selection acting on those genes. Here, I review the evolutionary theory of mutualism stability and identify how differing models make contrasting predictions for the population genomic diversity and geographic differentiation of mutualism-related genes. As an example of the possibilities offered by genomic data, I analyze genes with roles in the symbiosis of Medicago truncatula and nitrogen-fixing rhizobial bacteria, the first classic mutualism in which extensive genomic resources have been developed for both partners. Medicago truncatula symbiosis genes, as a group, differ from the rest of the genome, but they vary in the form of selection indicated by their diversity and differentiation - some show signs of selection expected from roles in sanctioning noncooperative symbionts, while others show evidence of balancing selection expected from coevolution with symbiont signaling factors. I then assess the current state of development for similar resources in other mutualistic interactions and look ahead to identify ways in which modern sequencing technology can best inform our understanding of mutualists and mutualism.
[Mh] Termos MeSH primário: Evolução Biológica
Genoma de Planta
Medicago truncatula/fisiologia
Sinorhizobium/fisiologia
Simbiose
[Mh] Termos MeSH secundário: Genômica
Medicago truncatula/genética
Metagenômica
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170523
[Lr] Data última revisão:
170523
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161030
[St] Status:MEDLINE


  6 / 202 MEDLINE  
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[PMID]:27671532
[Au] Autor:Grillo MA; Stinchcombe JR; Heath KD
[Ad] Endereço:University of Illinois, Department of Plant Biology, Urbana, Illinois 61801, USA mikegrillo@gmail.com.
[Ti] Título:Nitrogen addition does not influence pre-infection partner choice in the legume-rhizobium symbiosis.
[So] Source:Am J Bot;103(10):1763-1770, 2016 Oct.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Resource mutualisms such as the symbiosis between legumes and nitrogen-fixing rhizobia are context dependent and are sensitive to various aspects of the environment, including nitrogen (N) addition. Mutualist hosts such as legumes are also thought to use mechanisms such as partner choice to discriminate among potential symbionts that vary in partner quality (fitness benefits conferred to hosts) and thus impose selection on rhizobium populations. Together, context dependency and partner choice might help explain why the legume-rhizobium mutualism responds evolutionarily to N addition, since plant-mediated selection that shifts in response to N might be expected to favor different rhizobium strains in different N environments. METHODS: We test for the influence of context dependency on partner choice in the model legume, Medicago truncatula, using a factorial experiments with three plant families across three N levels with a mixed inoculation of three rhizobia strains. KEY RESULTS: Neither the relative frequencies of rhizobium strains occupying host nodules, nor the size of those nodules, differed in response to N level. CONCLUSIONS: Despite the lack of context dependence, plant genotypes respond very differently to mixed populations of rhizobia, suggesting that these traits are genetically variable and thus could evolve in response to longer-term increases in N.
[Mh] Termos MeSH primário: Medicago truncatula/fisiologia
Fixação de Nitrogênio
Nodulação
Sinorhizobium/fisiologia
Simbiose
[Mh] Termos MeSH secundário: Genótipo
Medicago truncatula/genética
Medicago truncatula/microbiologia
Sinorhizobium/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170523
[Lr] Data última revisão:
170523
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160928
[St] Status:MEDLINE


  7 / 202 MEDLINE  
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[PMID]:27664091
[Au] Autor:Bamba M; Nakata S; Aoki S; Takayama K; Núñez-Farfán J; Ito M; Miya M; Kajita T
[Ad] Endereço:Department of Biology, Graduate School of Science, Chiba University, 1-33 Yayoi, Inage, Chiba-shi, Chiba, 263-8522, Japan.
[Ti] Título:Wide distribution range of rhizobial symbionts associated with pantropical sea-dispersed legumes.
[So] Source:Antonie Van Leeuwenhoek;109(12):1605-1614, 2016 Dec.
[Is] ISSN:1572-9699
[Cp] País de publicação:Netherlands
[La] Idioma:eng
[Ab] Resumo:To understand the geographic distributions of rhizobia that associated with widely distributed wild legumes, 66 nodules obtained from 41 individuals including three sea-dispersed legumes (Vigna marina, Vigna luteola, and Canavalia rosea) distributed across the tropical and subtropical coastal regions of the world were studied. Partial sequences of 16S rRNA and nodC genes extracted from the nodules showed that only Bradyrhizobium and Sinorhizobium were associated with the pantropical legumes, and some of the symbiont strains were widely distributed over the Pacific. Horizontal gene transfer of nodulation genes were observed within the Bradyrhizobium and Sinorhizobium lineages. BLAST searches in GenBank also identified records of these strains from various legumes across the world, including crop species. However, one of the rhizobial strains was not found in GenBank, which implies the strain may have adapted to the littoral environment. Our results suggested that some rhizobia, which associate with the widespread sea-dispersed legume, distribute across a broad geographic range. By establishing symbiotic relationships with widely distributed rhizobia, the pantropical legumes may also be able to extend their range much further than other legume species.
[Mh] Termos MeSH primário: Fabaceae/microbiologia
Rhizobiaceae/isolamento & purificação
[Mh] Termos MeSH secundário: Proteínas de Bactérias/genética
Bradyrhizobium/classificação
Bradyrhizobium/isolamento & purificação
Genes Bacterianos
Tipagem Molecular
N-Acetilglucosaminiltransferases/genética
Oceano Pacífico
Filogenia
RNA Bacteriano
RNA Ribossômico 16S/genética
Rhizobiaceae/classificação
Rhizobiaceae/genética
Rhizobium/classificação
Rhizobium/isolamento & purificação
Sinorhizobium/classificação
Sinorhizobium/isolamento & purificação
Simbiose
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Bacterial Proteins); 0 (RNA, Bacterial); 0 (RNA, Ribosomal, 16S); EC 2.4.1.- (N-Acetylglucosaminyltransferases); EC 2.4.1.- (NodC protein, Rhizobiales)
[Em] Mês de entrada:1701
[Cu] Atualização por classe:170112
[Lr] Data última revisão:
170112
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160925
[St] Status:MEDLINE


  8 / 202 MEDLINE  
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[PMID]:27562208
[Au] Autor:Powell AF; Doyle JJ
[Ad] Endereço:Cornell University, Section of Plant Biology, 412 Mann Library, Cornell University, Ithaca, New York 14853 USA.
[Ti] Título:Enhanced rhizobial symbiotic capacity in an allopolyploid species of Glycine (Leguminosae).
[So] Source:Am J Bot;103(10):1771-1782, 2016 Oct.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Previous studies have shown that polyploidy can alter biotic interactions, and it has been suggested that these effects may contribute to the increased ability for colonization of new habitats shown by many allopolyploids. Little is known, however, about the effects of allopolyploidy, which combines hybridity and genome doubling, on symbiotic interactions with rhizobial bacteria. METHODS: We examined interactions of the allopolyploid Glycine dolichocarpa (designated T2) with novel rhizobial partners, such as might occur in a context of colonization, and compared these with the responses of its diploid progenitors, G. tomentella (D3) and G. syndetika (D4). We assessed root hair response, nodule formation, nodule mass, nodule number, and plant biomass. KEY RESULTS: The allopolyploid (T2) showed a greater root hair deformation response when exposed to rhizobia, compared with either diploid. T2 had a greater probability of forming nodules with NGR234 compared with diploid D4, and greater total nodule mass per nodulated plant compared with diploid D3. T2 also had greater plant biomass responses to nitrogen and when exposed to NGR234. CONCLUSIONS: The allopolyploid is characterized by transgressive responses to rhizobia for some variables, while also combining certain parental diploid responses such that its capacity for interactions with rhizobia appears to be greater than for either diploid progenitor. This overall enhanced nodulation capacity and the ability to make greater gains from exposure to both rhizobia and additional nitrogen indicate a greater potential of the allopolyploid to benefit from these factors both generally and in a context of colonization.
[Mh] Termos MeSH primário: Bradyrhizobium/fisiologia
Fabaceae/fisiologia
Nodulação
Sinorhizobium/fisiologia
[Mh] Termos MeSH secundário: Biomassa
Fabaceae/genética
Fabaceae/microbiologia
Poliploidia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170523
[Lr] Data última revisão:
170523
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160827
[St] Status:MEDLINE


  9 / 202 MEDLINE  
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[PMID]:27498183
[Au] Autor:Chiboub M; Saadani O; Fatnassi IC; Abdelkrim S; Abid G; Jebara M; Jebara SH
[Ad] Endereço:Laboratoire des légumineuses, centre de biotechnologie Borj Cedria, university Tunis El Manar, BP 901, 2050 Hammam Lif, Tunisia.
[Ti] Título:Characterization of efficient plant-growth-promoting bacteria isolated from Sulla coronaria resistant to cadmium and to other heavy metals.
[So] Source:C R Biol;339(9-10):391-8, 2016 Sep-Oct.
[Is] ISSN:1768-3238
[Cp] País de publicação:France
[La] Idioma:eng
[Ab] Resumo:The inoculation of plants with plant-growth-promoting rhizobacteria has become a priority in the phytoremediation of heavy-metal-contaminated soils. A total of 82 bacteria were isolated from Sulla coronaria root nodules cultivated on four soil samples differently contaminated by heavy metals. The phenotypic characterization of these isolates demonstrated an increased tolerance to cadmium reaching 4.1mM, and to other metals, including Zn, Cu and Ni. Polymerase Chain Reaction/Restriction Fragment Length Polymorphism (PCR/RFLP) analysis showed a large diversity represented by genera related to Agrobacterium sp., R. leguminosarum, Sinorhizobium sp., Pseudomonas sp., and Rhizobium sp. Their symbiotic effectiveness was evaluated by nodulation tests. Taking into consideration efficiency and cadmium tolerance, four isolates were chosen; their 16SrRNA gene sequence showed that they belonged to Pseudomonas sp. and the Rhizobium sullae. The selected consortium of soil bacteria had the ability to produce plant-growth-promoting substances such as indole acetic acid and siderophore. The intracellular Cd accumulation was enhanced by increasing the time of incubation of the four soil bacteria cultivated in a medium supplemented with 0.1mM Cd. The existence of a cadmium-resistant gene was confirmed by PCR. These results suggested that Sulla coronaria in symbiosis with the consortium of plant-growth-promoting rhizobacteria (PGPR) could be useful in the phytoremediation of cadmium-contaminated soils.
[Mh] Termos MeSH primário: Bactérias/química
Cádmio/toxicidade
Fabaceae/crescimento & desenvolvimento
Fabaceae/microbiologia
Metais Pesados/toxicidade
Microbiologia do Solo
Poluentes do Solo/toxicidade
[Mh] Termos MeSH secundário: Agrobacterium/genética
Biodegradação Ambiental
Biodiversidade
Variação Genética
Nodulação/genética
Raízes de Plantas/microbiologia
Pseudomonas/genética
RNA Bacteriano/genética
RNA Ribossômico 16S/genética
Rhizobium/genética
Sinorhizobium/genética
Simbiose
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Metals, Heavy); 0 (RNA, Bacterial); 0 (RNA, Ribosomal, 16S); 0 (Soil Pollutants); 00BH33GNGH (Cadmium)
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170309
[Lr] Data última revisão:
170309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160808
[St] Status:MEDLINE


  10 / 202 MEDLINE  
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[PMID]:27118154
[Au] Autor:Muñoz N; Qi X; Li MW; Xie M; Gao Y; Cheung MY; Wong FL; Lam HM
[Ad] Endereço:Centre for Soybean Research of the Partner State Key Laboratory of Agrobiotechnology and School of Life Sciences, The Chinese University of Hong Kong, Shatin, Hong Kong SAR.
[Ti] Título:Improvement in nitrogen fixation capacity could be part of the domestication process in soybean.
[So] Source:Heredity (Edinb);117(2):84-93, 2016 Aug.
[Is] ISSN:1365-2540
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Biological nitrogen fixation (BNF) in soybeans is a complex process involving the interplay between the plant host and the symbiotic rhizobia. As nitrogen supply has a crucial role in growth and development, higher nitrogen fixation capacity would be important to achieve bigger plants and larger seeds, which were important selection criteria during plant domestication by humans. To test this hypothesis, we monitored the nitrogen fixation-related performance in 31 cultivated and 17 wild soybeans after inoculation with the slow-growing Bradyrhizobium diazoefficiens sp. nov. USDA110 and the fast-growing Sinorhizobium (Ensifer) fredii CCBAU45436. Our results showed that, in general, cultivated soybeans gave better performance in BNF. Electron microscopic studies indicated that there was an exceptionally high accumulation of poly-ß-hydroxybutyrate bodies in bacteroids in the nodules of all wild soybeans tested, suggesting that the C/N balance in wild soybeans may not be optimized for nitrogen fixation. Furthermore, we identified new quantitative trait loci (QTLs) for total ureides and total nodule fresh weight by employing a recombinant inbred population composed of descendants from a cross between a cultivated and a wild parent. Using nucleotide diversity (θπ), divergence index (Fst) and distribution of fixed single-nucleotide polymorphisms as parameters, we found that some regions in the total ureides QTL on chromosome 17 and the total nodule fresh weight QTL on chromosome 12 exhibited very low diversity among cultivated soybeans, suggesting that these were traits specially selected during the domestication and breeding process.
[Mh] Termos MeSH primário: Domesticação
Fixação de Nitrogênio
Feijão de Soja/genética
[Mh] Termos MeSH secundário: Bradyrhizobium/metabolismo
Mapeamento Cromossômico
Hidroxibutiratos/metabolismo
Nitrogênio/metabolismo
Melhoramento Vegetal
Poliésteres/metabolismo
Polimorfismo de Nucleotídeo Único
Locos de Características Quantitativas
Nódulos Radiculares de Plantas/microbiologia
Sinorhizobium/metabolismo
Feijão de Soja/microbiologia
Simbiose
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Hydroxybutyrates); 0 (Polyesters); 26063-00-3 (poly-beta-hydroxybutyrate); N762921K75 (Nitrogen)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170801
[Lr] Data última revisão:
170801
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160428
[St] Status:MEDLINE
[do] DOI:10.1038/hdy.2016.27



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