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  1 / 26119 MEDLINE  
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[PMID]:29309428
[Au] Autor:Sarika K; Hossain F; Muthusamy V; Zunjare RU; Baveja A; Goswami R; Thirunavukkarasu N; Jha SK; Gupta HS
[Ad] Endereço:Division of Genetics, ICAR-Indian Agricultural Research Institute, New Delhi, India.
[Ti] Título:Opaque16, a high lysine and tryptophan mutant, does not influence the key physico-biochemical characteristics in maize kernel.
[So] Source:PLoS One;13(1):e0190945, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The enhancement of lysine and tryptophan in maize is so far basedon opaque2(o2) mutant, that along with the endosperm-modifiersled to development of Quality Protein Maize[QPM]. Though many mutants improving the endospermic protein quality were discovered, they could not be successfully deployed. Recently discovered opaque16 (o16)mutant enhances the lysine and tryptophan content in maize endosperm. In the present study, the influence of o16 on the endosperm modification was analyzed in four F2 populations, two each segregating for o16 allele alone and in combination with o2. The recessive o16o16 seed endosperm was found to be vitreousphenotypically similar to wild-O16O16. The mutant did not influence the degree of kernel opaqueness in o2o2 genetic background as opaqueness in o2o2/O16O16 and o2o2/o16o16 was similar. Grain hardness of o16o16 was comparable with the normal and QPM maize. The pattern of microscopic organization of proteinaceous matrix and starch granules, and zein profiling of the storage protein in o16o16 were found to be similar with normal maize endosperm, but distinct from the o2o2-soft genotype. The pattern in o2o2/o16o16 was unique and different from o2o2 and o16o16 as well. Here we demonstrated the effects of o16 on physico-biochemical characteristics of endosperm and report of o16 possessing negligible influence on kernel modification and hardness, which holds a great significance in maize quality breeding programme.
[Mh] Termos MeSH primário: Lisina/metabolismo
Mutação
Proteínas de Plantas/metabolismo
Triptofano/metabolismo
Zea mays/metabolismo
[Mh] Termos MeSH secundário: Genes de Plantas
Marcadores Genéticos
Proteínas de Plantas/química
Proteínas de Plantas/genética
Zea mays/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Genetic Markers); 0 (Plant Proteins); 8DUH1N11BX (Tryptophan); K3Z4F929H6 (Lysine)
[Em] Mês de entrada:1803
[Cu] Atualização por classe:180309
[Lr] Data última revisão:
180309
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180109
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0190945


  2 / 26119 MEDLINE  
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[PMID]:29247933
[Au] Autor:Ma J; Lei E; Lei M; Liu Y; Chen T
[Ad] Endereço:Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, PR China; Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, PR China; College of Natural Resources and Environment, South China Agricultural University, Guang
[Ti] Título:Remediation of Arsenic contaminated soil using malposed intercropping of Pteris vittata L. and maize.
[So] Source:Chemosphere;194:737-744, 2018 Mar.
[Is] ISSN:1879-1298
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Intercropping of arsenic (As) hyperaccumulator and cash crops during remediation of contaminated soil has been applied in farmland remediation project. However, little is known about the fate of As fractions in the soil profile and As uptake within the intercropping plants under field condition. In this study, As removal, uptake, and translocation were investigated within an intercropping system of Pteris vittata L. (P. vittata) and maize (Zea mays). Results indicated that the concentration of As associated with amorphous Fe (hydr)oxides in the 10-20 cm soil layer was significantly lower under malposed intercropping of P. vittata and maize, and As accumulation in P. vittata and biomass of P. vittata were simultaneously higher under malposed intercropping than under coordinate intercropping, leading to a 2.4 times higher rate of As removal. Although maize roots absorbed over 13.4 mg kg As and maize leaves and flowers accumulated over 21.5 mg kg As (translocation factor higher than 1), grains produced in all intercropping modes accumulated lower levels of As, satisfying the standard for human consumption. Our results suggested that malposed intercropping of a hyperaccumulator and a low-accumulation cash crop was an ideal planting pattern for As remediation in soil. Furthermore, timely harvest of P. vittata, agronomic strategies during remediation, and appropriate management of the above ground parts of P. vittata and high-As tissues of cash crops may further improve remediation efficiency.
[Mh] Termos MeSH primário: Arsênico/farmacocinética
Pteris
Poluentes do Solo/análise
Zea mays/metabolismo
[Mh] Termos MeSH secundário: Arsênico/análise
Arsênico/metabolismo
Biodegradação Ambiental
Biomassa
Seres Humanos
Componentes Aéreos da Planta/química
Raízes de Plantas/química
Solo/química
Poluentes do Solo/metabolismo
Poluentes do Solo/farmacocinética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Soil); 0 (Soil Pollutants); N712M78A8G (Arsenic)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180228
[Lr] Data última revisão:
180228
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171217
[St] Status:MEDLINE


  3 / 26119 MEDLINE  
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[PMID]:28741730
[Au] Autor:Yin G; Bai C; Sun J; Sun L; Xue Y; Zhang Y; Zhao H; Yu Z; Liu S; Zhang K
[Ad] Endereço:Inner Mongolia Academy of Agriculture and Animal Husbandry Science, Hohhot, China.
[Ti] Título:Fermentation quality and nutritive value of total mixed ration silages based on desert wormwood (Artemisia desertorum Spreng.) combining with early stage corn.
[So] Source:Anim Sci J;88(12):1963-1969, 2017 Dec.
[Is] ISSN:1740-0929
[Cp] País de publicação:Australia
[La] Idioma:eng
[Ab] Resumo:This study aimed to investigate the fermentation quality and nutritive value of total mixed ration (TMR) silages based on desert wormwood (DW) combined with early stage corn (ESC) as forage and determine an optimum formula. Desert wormwood and ESC were harvested, chopped, and mixed with other ingredients according to a formula, packed into laboratory silos at densities of 500-550 g/L, and stored in the dark for 60 days. The DW proportions in the forage of TMR were 1, 0.75, 0.50, 0.25 and 0, based on fresh weight. As the proportion of DW decreased, the pH also decreased (P < 0.05), while lactic acid, lactic acid/acetic acid, crude protein, starch, and the in vitro digestibility of dry matter and neutral detergent fiber increased (P < 0.05). Ammonia nitrogen/total nitrogen in the TMR silages with DW proportions of 0.75, 0.25 and 0 in the forage was more than 10%. These results indicated that the quality of the TMR silage containing DW alone as forage was poor, TMR silages containing DW proportions of 0.75 and 0.25, and ESC alone, in the forage were not well preserved. The optimum TMR silage formula contained a DW proportion of 0.5 in the forage.
[Mh] Termos MeSH primário: Artemisia
Fermentação
Valor Nutritivo
Silagem
Zea mays
[Mh] Termos MeSH secundário: Acetatos/análise
Amônia/análise
Concentração de Íons de Hidrogênio
Ácido Láctico/análise
Nitrogênio/análise
Proteínas/análise
Silagem/análise
Amido/análise
Fatores de Tempo
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Acetates); 0 (Proteins); 33X04XA5AT (Lactic Acid); 7664-41-7 (Ammonia); 9005-25-8 (Starch); N762921K75 (Nitrogen)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180227
[Lr] Data última revisão:
180227
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170726
[St] Status:MEDLINE
[do] DOI:10.1111/asj.12862


  4 / 26119 MEDLINE  
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[PMID]:29342221
[Au] Autor:Li Z; Coffey L; Garfin J; Miller ND; White MR; Spalding EP; de Leon N; Kaeppler SM; Schnable PS; Springer NM; Hirsch CN
[Ad] Endereço:Department of Agronomy and Plant Genetics, University of Minnesota, Saint Paul, Minnesota, United States of America.
[Ti] Título:Genotype-by-environment interactions affecting heterosis in maize.
[So] Source:PLoS One;13(1):e0191321, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The environment can influence heterosis, the phenomena in which the offspring of two inbred parents exhibits phenotypic performance beyond the inbred parents for specific traits. In this study we measured 25 traits in a set of 47 maize hybrids and their inbred parents grown in 16 different environments with varying levels of average productivity. By quantifying 25 vegetative and reproductive traits across the life cycle we were able to analyze interactions between the environment and multiple distinct instances of heterosis. The magnitude and rank among hybrids for better-parent heterosis (BPH) varied for the different traits and environments. Across the traits, a higher within plot variance was observed for inbred lines compared to hybrids. However, for most traits, variance across environments was not significantly different for inbred lines compared to hybrids. Further, for many traits the correlations of BPH to hybrid performance and BPH to better parent performance were of comparable magnitude. These results indicate that inbred lines and hybrids show similar trends in environmental response and both are contributing to observed genotype-by-environment interactions for heterosis. This study highlights the degree of heterosis is not an inherent trait of a specific hybrid, but varies depending on the trait measured and the environment where that trait is measured. Studies that attempt to correlate molecular processes with heterosis are hindered by the fact that heterosis is not a consistent attribute of a specific hybrid.
[Mh] Termos MeSH primário: Interação Gene-Ambiente
Vigor Híbrido/genética
Zea mays/genética
[Mh] Termos MeSH secundário: Genótipo
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180226
[Lr] Data última revisão:
180226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180118
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0191321


  5 / 26119 MEDLINE  
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[PMID]:29336154
[Au] Autor:Santiago R; López-Malvar A; Souto C; Barros-Ríos J
[Ad] Endereço:Departamento Biología Vegetal y Ciencias del Suelo, Unidad Asociada BVE1-UVIGO y Misión Biológica de Galicia (CSIC), Universidad de Vigo , Campus As Lagoas Marcosende, 36310 Vigo, Spain.
[Ti] Título:Methods for Determining Cell Wall-Bound Phenolics in Maize Stem Tissues.
[So] Source:J Agric Food Chem;66(5):1279-1284, 2018 Feb 07.
[Is] ISSN:1520-5118
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:We compared two methods with different sample pretreatment, hydrolysis, and separation procedures to extract cell wall-bound phenolics. The samples were pith and rind tissues from six maize inbred lines reportedly containing different levels of cell wall-bound phenolics. In method 1, pretreated samples were extracted with a C solid-phase extraction cartridge, and it took 6 days to complete. In method 2, phenolics were extracted from crude samples with ethyl acetate, it took 2 days to complete, and the cost per sample was reduced more than 60%. Both methods extracted more 4-coumarate than ferulate. Overall, method 1 yielded more 4-coumarate, while method 2 yielded more ferulate. The lack of a genotype × method interaction and significant correlations between the results obtained using the two methods indicate that both methods are reliable for use in large-scale plant breeding programs. Method 2, scaled, is proposed for general plant biology research.
[Mh] Termos MeSH primário: Parede Celular/metabolismo
Fenóis/análise
Fenóis/metabolismo
Caules de Planta/química
Zea mays/química
[Mh] Termos MeSH secundário: Cruzamento
Parede Celular/química
Cromatografia Líquida de Alta Pressão
Ácidos Cumáricos/análise
Esterificação
Genótipo
Hidrólise
Propionatos/análise
Extração em Fase Sólida/métodos
Zea mays/genética
[Pt] Tipo de publicação:COMPARATIVE STUDY; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Coumaric Acids); 0 (Phenols); 0 (Propionates); AVM951ZWST (ferulic acid); IBS9D1EU3J (trans-3-(4'-hydroxyphenyl)-2-propenoic acid)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180226
[Lr] Data última revisão:
180226
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180117
[St] Status:MEDLINE
[do] DOI:10.1021/acs.jafc.7b05752


  6 / 26119 MEDLINE  
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[PMID]:29251876
[Au] Autor:Kiran KR; Ravi MV; Dhanya B; Janagoudar BS; Umesh MR; Narayanarao K
[Ti] Título:Do emissions from thermal power plants affect crop productivity? A study from the vicinity of Bellary Thermal Power Station, Karnataka, India.
[So] Source:J Environ Biol;37(5):949-54, 2016 09.
[Is] ISSN:0254-8704
[Cp] País de publicação:India
[La] Idioma:eng
[Ab] Resumo:In the present study, ambient air quality was monitored during July to November 2013 in the vicinity of Bellary Thermal Power Station (BTPS), Karnataka to assess the impact of pollutants emitted from power plant on the productivity of maize (Zea mays L.). Atmospheric pollutant load were measured in five different villages at varying distances and directions from thermal power plant, with the village farthest away from BTPS (Yelubenchi) as control. Maize yield was also estimated in these locations and correlated to the pollutant concentrations. It was found that, both particulate matter and SO2 which are indicators of emissions from coal-fueled power plants were highest in Thimmalapur village located in the predominant down wind direction. A significant reduction in maize yield was noticed (8197 to 6509 kg ha-1 for seed and 14041 to 9933 kg ha-1 for stover) across the gradient in distance and direction from BTPS which might be influenced by the pollutants emitted. The implications of these observations are further discussed in the paper.
[Mh] Termos MeSH primário: Poluentes Atmosféricos/toxicidade
Produtos Agrícolas/efeitos dos fármacos
Centrais Elétricas
Zea mays/efeitos dos fármacos
[Mh] Termos MeSH secundário: Índia
Fatores de Tempo
Zea mays/fisiologia
[Pt] Tipo de publicação:RESEARCH SUPPORT, NON-U.S. GOV'T; JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Air Pollutants)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180222
[Lr] Data última revisão:
180222
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171219
[St] Status:MEDLINE


  7 / 26119 MEDLINE  
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[PMID]:29293613
[Au] Autor:Silva JC; Carvalho CR; Clarindo WR
[Ad] Endereço:Laboratório de Citogenética e Citometria, Departamento de Biologia Geral, Centro de Ciências Biológicas e da Saúde, Universidade Federal de Viçosa, Viçosa-MG, Brazil.
[Ti] Título:Updating the maize karyotype by chromosome DNA sizing.
[So] Source:PLoS One;13(1):e0190428, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The karyotype is a basic concept regarding the genome, fundamentally described by the number and morphological features of all chromosomes. Chromosome class, centromeric index, intra- and interchromosomal asymmetry index, and constriction localization are important in clinical, systematic and evolutionary approaches. In spite of the advances in karyotype characterization made over the last years, new data about the chromosomes can be generated from quantitative methods, such as image cytometry. Therefore, using Zea mays L., this study aimed to update the species' karyotype by supplementing information on chromosome DNA sizing. After adjustment of the procedures, chromosome morphometry and class as well as knob localization enabled describing the Z. mays karyotype. In addition, applying image cytometry, DNA sizing was unprecedentedly measured for the arms and satellite of all chromosomes. This way, unambiguous identification of the chromosome pairs, and hence the assembly of 51 karyograms, were only possible after the DNA sizing of each chromosome, their arms and satellite portions. These accurate, quantitative and reproducible data also enabled determining the distribution and variation of DNA content in each chromosome. From this, a correlation between DNA amount and total chromosome length evidenced that the mean DNA content of chromosome 9 was higher than that of chromosome 8. The chromosomal DNA sizing updated the Z. mays karyotype, providing insights into its dynamic genome with regards to the organization of the ten chromosomes and their respective portions. Considering the results and the relevance of cytogenetics in the current scenario of comparative sequencing and genomics, chromosomal DNA sizing should be incorporated as an additional parameter for karyotype definition. Based on this study, it can be affirmed that cytogenetic approaches go beyond the simple morphological description of chromosomes.
[Mh] Termos MeSH primário: Cromossomos de Plantas
DNA de Plantas/genética
Cariotipagem
Zea mays/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (DNA, Plant)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180221
[Lr] Data última revisão:
180221
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180103
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0190428


  8 / 26119 MEDLINE  
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[PMID]:29257652
[Au] Autor:Ganie AH; Yousuf PY; Ahad A; Pandey R; Ahmad S; Aref IM; Noor JJ; Iqbal M
[Ti] Título:Quantification of phenolic acids and antioxidant potential of inbred, hybrid and composite cultivars of maize under different nitrogen regimes.
[So] Source:J Environ Biol;37(6):1273-79, 2016 Nov.
[Is] ISSN:0254-8704
[Cp] País de publicação:India
[La] Idioma:eng
[Ab] Resumo:Maize (Zea mays L.) is a multipurpose crop, which is immensely used worldwide for its nutritional as well as medicinal properties. This study evaluates the effect of varying concentrations of nitrogen (N) on accumulation of phenolic acids and antioxidant activity in different maize cultivars, including inbreds, hybrids and a composite, which were grown in natural light under controlled temperature (30°C/20°C D/N) and humidity (80%), with sufficient (4.5mM) and low (0.05mM) nitrogen supply. Seeds of different cultivars were powdered and extracted in a methanol:water (80:20) mixture through reflux at 60-75°C, and the extracts obtained were subjected to high performance thin layer chromatography (HPTLC), using ethyl acetate: acetic acid: formic acid: water (109:16:12:31) solvent system for the separation of phenolic acids. Antioxidant activity of the extracts was determined by 2,2-diphenyl-1-picrylhydrazyl (DPPH) and H2O2-scavenging activity assays. At sufficient nitrogen condition, the contents of different phenolic acids were higher in the composite cultivar (8.7 mg g-1 d.wt. in gallic acid to 39.3 mg g-1 d.wt. in cinnamic and salicylic acids) than in inbreds and hybrids. Under low nitrogen condition, the phenolic acids contents declined significantly in inbreds and hybrids, but remained almost unaffected in the composite. The antioxidant activity was also the maximum in the composite, and declined similarly as phenolic acids under low nitrogen supply, showing a significant reduction in inbreds and hybrids only. Therefore, the maize composite has a potential for being used as a nutraceutical in human-health sector.
[Mh] Termos MeSH primário: Antioxidantes/metabolismo
Hidroxibenzoatos/metabolismo
Nitrogênio/farmacologia
Zea mays/genética
Zea mays/fisiologia
[Mh] Termos MeSH secundário: Antioxidantes/química
Cruzamentos Genéticos
Hidroxibenzoatos/química
Endogamia
Zea mays/efeitos dos fármacos
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
0 (Antioxidants); 0 (Hydroxybenzoates); 29656-58-4 (phenolic acid); N762921K75 (Nitrogen)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180219
[Lr] Data última revisão:
180219
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171220
[St] Status:MEDLINE


  9 / 26119 MEDLINE  
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[PMID]:29304111
[Au] Autor:Li P; Du C; Zhang Y; Yin S; Zhang E; Fang H; Lin D; Xu C; Yang Z
[Ad] Endereço:Jiangsu Key Laboratory of Crop Genetics and Physiology/Co-Innovation Center for Modern Production Technology of Grain Crops, Key Laboratory of Plant Functional Genomics of the Ministry of Education, Yangzhou University, Yangzhou, China.
[Ti] Título:Combined bulked segregant sequencing and traditional linkage analysis for identification of candidate gene for purple leaf sheath in maize.
[So] Source:PLoS One;13(1):e0190670, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Anthocyanin accumulation in various maize tissues plays important roles in plant growth and development. In addition, some color-related traits can be used as morphological markers in conventional maize breeding processes and purity identification of hybrid seeds. Here, we noticed that the leaf sheath color was controlled by a dominant gene, because purple (PSH) and green leaf sheaths (GSH) were separated at a ratio of 3:1 in an F2 population. To map the gene, an F2 and a recombinant inbred line (RIL) population were derived from a cross between inbred line T877 (PSH) and DH1M (GSH). The PSH locus was mapped to the genomic region within 128.8 to 138.4 Mb using a bulked segregant sequencing approach. This position was further validated by linkage mapping using 190 F2 plants with GSH. Subsequently, the PSH locus was fine-mapped into an interval of 304.2 kb. A maize gene, GRMZM5G822829, was identified in this region, encoding a bHLH transcription factor. The expression level of this gene in T877 was found to be 9-fold higher than that of DH1M. In conclusion, our results suggest that GRMZM5G822829 is the putative candidate gene conferring leaf sheath color in maize.
[Mh] Termos MeSH primário: Genes de Plantas
Ligação Genética
Folhas de Planta/genética
Zea mays/genética
[Mh] Termos MeSH secundário: Genes Dominantes
Sequenciamento de Nucleotídeos em Larga Escala
Reação em Cadeia da Polimerase em Tempo Real
Reação em Cadeia da Polimerase Via Transcriptase Reversa
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180215
[Lr] Data última revisão:
180215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180106
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0190670


  10 / 26119 MEDLINE  
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[PMID]:29293518
[Au] Autor:Poggio L; González GE
[Ad] Endereço:Instituto de Ecología, Genética y Evolución (IEGEBA, Consejo Nacional de Investigaciones Científicas y Técnicas-CONICET)-Laboratorio de Citogenética y Evolución (LaCyE), Departamento de Ecología, Genética y Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Autónoma de Buenos Aires, Argentina.
[Ti] Título:Cytological diploidization of paleopolyploid genus Zea: Divergence between homoeologous chromosomes or activity of pairing regulator genes?
[So] Source:PLoS One;13(1):e0189644, 2018.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Cytological diploidization process is different in autopolyploid and allopolyploid species. Colchicine applied at the onset of meiosis suppresses the effect of pairing regulator genes resulting multivalents formation in bivalent-forming species. Colchicine treated maizes (4x = 2n = 20, AmAmBmBm) showed up to 5IV, suggesting pairing between chromosomes from genomes homoeologous Am and Bm. In untreated individuals of the alloautooctoploid Zea perennis (8x = 2n = 40, ApApAp´Ap´Bp1Bp1Bp2Bp2) the most frequent configuration was 5IV+10II (formed by A and B genomes, respectively). The colchicine treated Z. perennis show up to 10IV revealing higher affinity within genomes A and B, but any homology among them. These results suggest the presence of a paring regulator locus (PrZ) in maize and Z. perennis, whose expression is suppressed by colchicine. It could be postulated that in Z. perennis, PrZ would affect independently the genomes A and B, being relevant the threshold of homology, the fidelity of pairing in each genomes and the ploidy level. Cytological analysis of the treated hexaploid hybrids (6x = 2n = 30), with Z. perennis as a parental, strongly suggests that PrZ is less effective in only one doses. This conclusion was reinforced by the homoeologous pairing observed in untreated dihaploid maizes, which showed up to 5II. Meiotic behaviour of individuals treated with different doses of colchicine allowed to postulate that PrZ affect the homoeologous association by controlling entire genomes (Am or Bm) rather than individual chromosomes. Based on cytological and statistical results it is possible to propose that the cytological diploidization in Zea species occurs by restriction of pairing between homoeologous chromosomes or by genetical divergence of the homoeologous chromosomes, as was observed in untreated Z. mays ssp. parviglumis. These are independent but complementary systems and could be acting jointly in the same nucleus.
[Mh] Termos MeSH primário: Cromossomos de Plantas
Diploide
Genes Reguladores
Zea mays/genética
[Mh] Termos MeSH secundário: Colchicina/administração & dosagem
Meiose
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Nm] Nome de substância:
SML2Y3J35T (Colchicine)
[Em] Mês de entrada:1802
[Cu] Atualização por classe:180215
[Lr] Data última revisão:
180215
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:180103
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189644



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