Base de dados : MEDLINE
Pesquisa : B01.650.940.800.575.912.250.583.580 [Categoria DeCS]
Referências encontradas : 180 [refinar]
Mostrando: 1 .. 10   no formato [Detalhado]

página 1 de 18 ir para página                         

  1 / 180 MEDLINE  
              next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:29202710
[Au] Autor:Parvathaneni RK; DeLeo VL; Spiekerman JJ; Chakraborty D; Devos KM
[Ad] Endereço:Institute of Plant Breeding, Genetics and Genomics, University of Georgia, 30602, Athens, Georgia, United States.
[Ti] Título:Parallel loss of introns in the ABCB1 gene in angiosperms.
[So] Source:BMC Evol Biol;17(1):238, 2017 Dec 04.
[Is] ISSN:1471-2148
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: The presence of non-coding introns is a characteristic feature of most eukaryotic genes. While the size of the introns, number of introns per gene and the number of intron-containing genes can vary greatly between sequenced eukaryotic genomes, the structure of a gene with reference to intron presence and positions is typically conserved in closely related species. Unexpectedly, the ABCB1 (ATP-Binding Cassette Subfamily B Member 1) gene which encodes a P-glycoprotein and underlies dwarfing traits in maize (br2), sorghum (dw3) and pearl millet (d2) displayed considerable variation in intron composition. RESULTS: An analysis of the ABCB1 gene structure in 80 angiosperms revealed that the number of introns ranged from one to nine. All introns in ABCB1 underwent either a one-time loss (single loss in one lineage/species) or multiple independent losses (parallel loss in two or more lineages/species) with the majority of losses occurring within the grass family. In contrast, the structure of the closest homolog to ABCB1, ABCB19, remained constant in the majority of angiosperms analyzed. Using known phylogenetic relationships within the grasses, we determined the ancestral branch-points where the losses occurred. Intron 7, the longest intron, was lost in only a single species, Mimulus guttatus, following duplication of ABCB1. Semiquantitative PCR showed that the M. guttatus ABCB1 gene copy without intron 7 had significantly lower transcript levels than the gene copy with intron 7. We further demonstrated that intron 7 carried two motifs that were highly conserved across the monocot-dicot divide. CONCLUSIONS: The ABCB1 gene structure is highly dynamic, while the structure of ABCB19 remained largely conserved through evolution. Precise removal of introns, preferential removal of smaller introns and presence of at least 2 bp of microhomology flanking most introns indicated that intron loss may have predominantly occurred through non-homologous end-joining (NHEJ) repair of double strand breaks. Lack of microhomology in the exon upstream of lost phase I introns was likely due to release of the selective constraint on the penultimate base (3rd base in codon) of the terminal codon by the splicing machinery. In addition to size, the presence of regulatory motifs will make introns recalcitrant to loss.
[Mh] Termos MeSH primário: Genes de Plantas
Íntrons/genética
Magnoliopsida/genética
Proteínas de Plantas/genética
[Mh] Termos MeSH secundário: Arabidopsis/genética
Sequência de Bases
Sequência Conservada/genética
DNA Complementar/genética
Evolução Molecular
Regulação da Expressão Gênica de Plantas
Mimulus/genética
Motivos de Nucleotídeos/genética
Oryza/genética
Filogenia
Reação em Cadeia da Polimerase
Polimorfismo Genético
RNA Mensageiro/genética
RNA Mensageiro/metabolismo
Reprodutibilidade dos Testes
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Complementary); 0 (Plant Proteins); 0 (RNA, Messenger)
[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:171206
[St] Status:MEDLINE
[do] DOI:10.1186/s12862-017-1077-x


  2 / 180 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28455350
[Au] Autor:Monnahan PJ; Kelly JK
[Ad] Endereço:Department of Ecology and Evolutionary Biology, University of Kansas, Lawrence, Kansas 66045 Patrick.Monnahan@jic.ac.uk.
[Ti] Título:The Genomic Architecture of Flowering Time Varies Across Space and Time in .
[So] Source:Genetics;206(3):1621-1635, 2017 07.
[Is] ISSN:1943-2631
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The degree to which genomic architecture varies across space and time is central to the evolution of genomes in response to natural selection. Bulked-segregant mapping combined with pooled sequencing provides an efficient means to estimate the effect of genetic variants on quantitative traits. We develop a novel likelihood framework to identify segregating variation within multiple populations and generations while accommodating estimation error on a sample- and SNP-specific basis. We use this method to map loci for flowering time within natural populations of , collecting the early- and late-flowering plants from each of three neighboring populations and two consecutive generations. Structural variants, such as inversions, and genes from multiple flowering-time pathways exhibit the strongest associations with flowering time. We find appreciable variation in genetic effects on flowering time across both time and space; the greatest differences evident between populations, where numerous factors (environmental variation, genomic background, and private polymorphisms) likely contribute to heterogeneity. However, the changes across years within populations clearly identify genotype-by-environment interactions as an important influence on flowering time variation.
[Mh] Termos MeSH primário: Flores/genética
Genoma de Planta
Mimulus/genética
Polimorfismo de Nucleotídeo Único
[Mh] Termos MeSH secundário: Ecossistema
Flores/crescimento & desenvolvimento
Heterogeneidade Genética
Mimulus/crescimento & desenvolvimento
Locos de Características Quantitativas
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, N.I.H., EXTRAMURAL
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171213
[Lr] Data última revisão:
171213
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170430
[St] Status:MEDLINE
[do] DOI:10.1534/genetics.117.201483


  3 / 180 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28645920
[Au] Autor:Dixon AL; Busch JW
[Ad] Endereço:School of Biological Sciences, Washington State University, P.O. Box 644236, Pullman, Washington 99164 andrea.dixon@rothamsted.ac.uk.
[Ti] Título:Common garden test of range limits as predicted by a species distribution model in the annual plant .
[So] Source:Am J Bot;104(6):817-827, 2017 Jun.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Direct tests of a species distribution model (SDM) were used to evaluate the hypothesis that the northern and southern edges of 's geographical range are limited by temperature and precipitation. METHODS: Climatic suitability was predicted using an SDM informed only by temperature and precipitation variables. These predictions were tested by growing plants in growth chambers with temperature and watering treatments informed by weather stations characteristic of environments at the geographic center, edges, and outside the range. An Aster analysis was used to assess whether treatments significantly affected lifetime flower production and to test for local adaptation. The relationship between climatic suitability and lifetime flower number in the growth chambers was also evaluated. KEY RESULTS: The temperature and watering treatments significantly affected lifetime flower number, although local adaptation was not detected. Flower production was significantly lower under the two edge treatments compared to the central treatment. While no flowers were produced under the beyond-south treatments, flower production was greatest under the beyond-north treatment. These results suggest a hard abiotic limit at the southern edge, and suitable temperature and precipitation conditions beyond the northern edge. While predicted climatic suitability was significantly lower at the range edges, there was no correlation between the climatic suitability of the weather stations' locations and flower production. CONCLUSIONS: These results suggest that temperature and precipitation play a significant role in defining the distribution of , but also indicate that dispersal limitation or metapopulation dynamics are likely important factors restricting access to habitable sites beyond the northern range limit.
[Mh] Termos MeSH primário: Mimulus/fisiologia
Dispersão Vegetal
Temperatura Ambiente
Água/fisiologia
[Mh] Termos MeSH secundário: Geografia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
059QF0KO0R (Water)
[Em] Mês de entrada:1710
[Cu] Atualização por classe:171020
[Lr] Data última revisão:
171020
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170625
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600414


  4 / 180 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:28202451
[Au] Autor:Friedman J; Hart KS; den Bakker MC
[Ad] Endereço:Department of Biology, Syracuse University, 110 College Place, Syracuse, New York 13244 USA friedman@syr.edu.
[Ti] Título:Losing one's touch: Evolution of the touch-sensitive stigma in the species complex.
[So] Source:Am J Bot;104(2):335-341, 2017 Feb.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: The stigmas of several species are touch sensitive and respond to pressure by closing. Previous research suggests that stigma closure could prevent self pollination within a flower during a pollinator's visit or enhance male function by increasing pollen export. Both factors could be favored in outcrossers, and neither would be beneficial in selfers. METHODS: We investigated variation in stigma-closing and the duration of closure in annual and perennial populations of the variable species and whether four closely related selfing species ( , , , and ) have lost their touch sensitivity. We grew plants in a controlled environment and performed experiments with and without the addition of pollen to the stigma. KEY RESULTS: In , the speed of stigma-closing was rapid and unaffected by the deposition of pollen. Populations varied significantly in closing speed, which may reflect their geographic location. For annual populations only, anther-stigma separation significantly affected closing speed. Also, stigmas that closed quickly stayed closed longer, and stigmas that received pollen remained closed longer. Finally, in the selfing species, stigma-closing was more variable; some populations have entirely lost the ability to respond to touch. CONCLUSIONS: We discuss our results in the context of traits that promote outcrossing and traits that are under selection during the evolution of selfing. This is the first characterization of variation in touch responses across multiple populations within a species and the first to demonstrate the loss of touch sensitivity in selfing lineages.
[Mh] Termos MeSH primário: Flores/fisiologia
Mimulus/fisiologia
Pólen/fisiologia
Polinização/fisiologia
[Mh] Termos MeSH secundário: Animais
Seres Humanos
Mimulus/classificação
Fenômenos Fisiológicos Vegetais
Reprodução/fisiologia
Especificidade da Espécie
Fatores de Tempo
Tato/fisiologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1708
[Cu] Atualização por classe:170815
[Lr] Data última revisão:
170815
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170217
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600394


  5 / 180 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27539262
[Au] Autor:Sorin YB; Mitchell RJ; Trapnell DW; Karron JD
[Ad] Endereço:Department of Biological Sciences, P.O. Box 413, University of Wisconsin-Milwaukee, Milwaukee, Wisconsin 53201-0413 USA.
[Ti] Título:Effects of pollination and postpollination processes on selfing rate in Mimulus ringens.
[So] Source:Am J Bot;103(8):1524-8, 2016 08.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Selfing rates vary widely within and among populations of self-compatible flowering plants. This variation is often attributed to differences in the amount and timing of self and outcross pollen deposition on stigmas, as well as to the influence of postpollination mechanisms that control fertilization success. This study explores the relative importance of pollination and postpollination processes in determining selfing rates in monkeyflower, Mimulus ringens. METHODS: We hand-pollinated flowers on 17 unrelated mothers with pollen from one of three experimental treatments intended to replicate field conditions: (1) simultaneous deposition of 50% self pollen and 50% outcross pollen from 5 unrelated donors; (2) self pollen followed 15 min later by application of an equal amount of outcross pollen from five unrelated donors; and (3) outcross pollen from 5 unrelated donors followed 15 min later by application of an equal amount of self pollen. We genotyped 757 progeny at 8 polymorphic microsatellite loci and used paternity exclusion to determine whether each seedling was selfed or outcrossed. KEY RESULTS: When self and outcross pollen arrived simultaneously, and when self pollen arrived 15 min prior to outcross pollen, the observed proportions of self and outcross progeny did not deviate from the expected 1:1 ratio. However, when outcross pollen was applied 15 min prior to self pollen, there was a significant excess of outcross progeny. CONCLUSIONS: Selfing rate in Mimulus ringens is influenced by small differences in the timing of pollen arrival, but not by nonrandom postpollination sorting.
[Mh] Termos MeSH primário: Mimulus/fisiologia
Pólen/fisiologia
Polinização
Autofertilização
[Mh] Termos MeSH secundário: Genótipo
Mimulus/genética
Reprodução
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171121
[Lr] Data última revisão:
171121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160820
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600145


  6 / 180 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:27437404
[Au] Autor:Balogun FO; Tshabalala NT; Ashafa AO
[Ad] Endereço:Phytomedicine and Phytopharmacology Research Group, Department of Plant Sciences, University of the Free State, Qwaqwa Campus, Private Bag X 13, Phuthaditjhaba 9866, South Africa.
[Ti] Título:Antidiabetic Medicinal Plants Used by the Basotho Tribe of Eastern Free State: A Review.
[So] Source:J Diabetes Res;2016:4602820, 2016.
[Is] ISSN:2314-6753
[Cp] País de publicação:Egypt
[La] Idioma:eng
[Ab] Resumo:Diabetes mellitus (DM) belongs to the group of five leading important diseases causing death globally and remains a major health problem in Africa. A number of factors such as poverty, poor eating habit, and hormonal imbalance are responsible for the occurrence of the disease. It poses a major health challenge in Africa continent today and the prevalence continues to increase at an alarming rate. Various treatment options particularly the usage of herbs have been effective against diabetes because they have no adverse effects. Interestingly, South Africa, especially the Basotho tribe, is blessed with numerous medicinal plants whose usage in the treatment of DM has been effective since the conventional drugs are expensive and often unaffordable. The present study attempted to update the various scientific evidence on the twenty-three (23) plants originating from different parts of the world but widely used by the Sotho people in the management of DM. Asteraceae topped the list of sixteen (16) plant families and remained the most investigated according to this review. Although limited information was obtained on the antidiabetic activities of these plants, it is however anticipated that government parastatals and scientific communities will pay more attention to these plants in future research.
[Mh] Termos MeSH primário: Diabetes Mellitus/tratamento farmacológico
Hipoglicemiantes/uso terapêutico
Preparações de Plantas/uso terapêutico
Plantas Medicinais
[Mh] Termos MeSH secundário: Aloe
Apocynaceae
Asparagus (Planta)
Asteraceae
Cannabis
Commelina
Fabaceae
Seres Humanos
Hypoxidaceae
Hypoxis
Malvaceae
Mimulus
Myricaceae
Rubiaceae
Rumex
África do Sul
Xanthorrhoeaceae
[Pt] Tipo de publicação:JOURNAL ARTICLE; REVIEW
[Nm] Nome de substância:
0 (Hypoglycemic Agents); 0 (Plant Preparations)
[Em] Mês de entrada:1706
[Cu] Atualização por classe:170627
[Lr] Data última revisão:
170627
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160721
[St] Status:MEDLINE
[do] DOI:10.1155/2016/4602820


  7 / 180 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27283023
[Au] Autor:Stanton K; Valentin CM; Wijnen ME; Stutstman S; Palacios JJ; Cooley AM
[Ad] Endereço:Whitman College Biology Department, Walla Walla, Washington 99362 USA cooleya@whitman.edu.
[Ti] Título:Absence of postmating barriers between a selfing vs. outcrossing Chilean Mimulus species pair.
[So] Source:Am J Bot;103(6):1030-40, 2016 06.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Reproductive isolation between sympatric species pairs may be maintained by both pre- and postmating barriers. Here we evaluate potential barriers to mating between the outcrossing Mimulus luteus and its more highly selfing sympatric congener, M. cupreus, two members of the South American luteus complex of Mimulus. METHODS: Seed set was compared following autonomous self-pollination, manual pollination, conspecific outcrossing, and sympatric and allopatric hybridization, for laboratory-maintained inbred lines and wild-collected accessions. Survival and reproductive fitness of hybrids relative to parental species were examined across environments that differed with respect to temperature and soil nutrients, two factors that vary across the ranges of M. luteus and M. cupreus. KEY RESULTS: Mimulus luteus was minimally capable of autonomous self-fertilization, consistent with reliance on an animal pollinator, whereas M. cupreus was a successful selfer across all tested accessions. Postmating barriers to hybridization are negligible, in both low- and high-stress environments, across multiple sympatric and allopatric populations. CONCLUSION: As in the North American M. guttatus-M. nasutus species pair, postmating barriers contribute little to isolation between M. luteus and M. cupreus. This result reinforces the importance of premating barriers, specifically species differences in reliance on, and accessibility to, animal pollinators. A unique aspect of the M. luteus-M. cupreus pair is the recent gain of red floral anthocyanin pigmentation in M. cupreus. On the basis of species differences in vegetative anthocyanin production, a facultative stress-protective response, we propose a potential stress-protective role for the constitutive floral anthocyanins of M. cupreus.
[Mh] Termos MeSH primário: Cruzamentos Genéticos
Mimulus/fisiologia
Autofertilização/fisiologia
[Mh] Termos MeSH secundário: Chile
Secas
Ecótipo
Aptidão Genética
Temperatura Alta
Hibridização Genética
Endogamia
Folhas de Planta/fisiologia
Polinização/fisiologia
Isolamento Reprodutivo
Sementes/fisiologia
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171121
[Lr] Data última revisão:
171121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160611
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1600079


  8 / 180 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27221281
[Au] Autor:Vallejo-Marín M; Cooley AM; Lee MY; Folmer M; McKain MR; Puzey JR
[Ad] Endereço:Biological and Environmental Science, School of Natural Sciences, University of Stirling, Stirling, Scotland, FK9 4LA UK.
[Ti] Título:Strongly asymmetric hybridization barriers shape the origin of a new polyploid species and its hybrid ancestor.
[So] Source:Am J Bot;103(7):1272-88, 2016 07.
[Is] ISSN:1537-2197
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:PREMISE OF THE STUDY: Hybridization between diploids and tetraploids can lead to new allopolyploid species, often via a triploid intermediate. Viable triploids are often produced asymmetrically, with greater success observed for "maternal-excess" crosses where the mother has a higher ploidy than the father. Here we investigated the evolutionary origins of Mimulus peregrinus, an allohexaploid recently derived from the triploid M. ×robertsii, to determine whether reproductive asymmetry has shaped the formation of this new species. METHODS: We used reciprocal crosses between the diploid (M. guttatus) and tetraploid (M. luteus) progenitors to determine the viability of triploid M. ×robertsii hybrids resulting from paternal- vs. maternal-excess crosses. To investigate whether experimental results predict patterns seen in the field, we performed parentage analyses comparing natural populations of M. peregrinus to its diploid, tetraploid, and triploid progenitors. Organellar sequences obtained from pre-existing genomic data, supplemented with additional genotyping was used to establish the maternal ancestry of multiple M. peregrinus and M. ×robertsii populations. KEY RESULTS: We found strong evidence for asymmetric origins of M. peregrinus, but opposite to the common pattern, with paternal-excess crosses significantly more successful than maternal-excess crosses. These results successfully predicted hybrid formation in nature: 111 of 114 M. ×robertsii individuals, and 27 of 27 M. peregrinus, had an M. guttatus maternal haplotype. CONCLUSION: This study, which includes the first Mimulus chloroplast genome assembly, demonstrates the utility of parentage analysis through genome skimming. We highlight the benefits of complementing genomic analyses with experimental approaches to understand asymmetry in allopolyploid speciation.
[Mh] Termos MeSH primário: Genoma de Planta/genética
Hibridização Genética/genética
Mimulus/genética
Ploidias
[Mh] Termos MeSH secundário: Evolução Biológica
Diploide
Genoma de Cloroplastos/genética
Genoma Mitocondrial/genética
Genótipo
Reprodução/genética
Isolamento Reprodutivo
Triploidia
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1707
[Cu] Atualização por classe:171121
[Lr] Data última revisão:
171121
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160526
[St] Status:MEDLINE
[do] DOI:10.3732/ajb.1500471


  9 / 180 MEDLINE  
              first record previous record next record last record
seleciona
para imprimir
Fotocópia
Texto completo
[PMID]:27038381
[Au] Autor:Kenney AM; Sweigart AL
[Ad] Endereço:Department of Genetics, University of Georgia, Athens, GA, 30602, USA.
[Ti] Título:Reproductive isolation and introgression between sympatric Mimulus species.
[So] Source:Mol Ecol;25(11):2499-517, 2016 Jun.
[Is] ISSN:1365-294X
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:Incompletely isolated species provide an opportunity to investigate the genetic mechanisms and evolutionary forces that maintain distinct species in the face of ongoing gene flow. Here, we use field surveys and reduced representation sequencing to characterize the patterns of reproductive isolation, admixture and genomic divergence between populations of the outcrossing wildflower Mimulus guttatus and selfing M. nasutus. Focusing on a single site where these two species have come into secondary contact, we find that phenological isolation is strong, although incomplete, and is likely driven by divergence in response to photoperiod. In contrast to previous field studies, which have suggested that F1 -hybrid formation might be rare, we discover patterns of genomic variation consistent with ongoing introgression. Strikingly, admixed individuals vary continuously from highly admixed to nearly pure M. guttatus, demonstrating ongoing hybridization and asymmetric introgression from M. nasutus into M. guttatus. Patterns of admixture and divergence across the genome show that levels of introgression are more variable than expected by chance. Some genomic regions show a reduced introgression, including one region that overlaps a critical photoperiod QTL, whereas other regions show elevated levels of interspecific gene flow. In addition, we observe a genome-wide negative relationship between absolute divergence and the local recombination rate, potentially indicating natural selection against M. nasutus ancestry in M. guttatus genetic backgrounds. Together, our results suggest that Mimulus speciation is both ongoing and dynamic and that a combination of divergence in phenology and mating system, as well as selection against interspecific alleles, likely maintains these sympatric species.
[Mh] Termos MeSH primário: Genética Populacional
Hibridização Genética
Mimulus/genética
Isolamento Reprodutivo
Simpatria
[Mh] Termos MeSH secundário: DNA de Plantas/genética
Flores/fisiologia
Fluxo Gênico
Especiação Genética
Genoma de Planta
Mimulus/classificação
Fotoperíodo
Locos de Características Quantitativas
Análise de Sequência de DNA
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (DNA, Plant)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170504
[Lr] Data última revisão:
170504
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160403
[St] Status:MEDLINE
[do] DOI:10.1111/mec.13630


  10 / 180 MEDLINE  
              first record previous record
seleciona
para imprimir
Fotocópia
PubMed Central Texto completo
Texto completo
[PMID]:26884205
[Au] Autor:Yuan YW; Rebocho AB; Sagawa JM; Stanley LE; Bradshaw HD
[Ad] Endereço:Department of Biology, University of Washington, Seattle, WA 98195; Department of Ecology and Evolutionary Biology, University of Connecticut, Storrs, CT 06269; Institute for Systems Genomics, University of Connecticut, Storrs, CT 06269; yuan.colreeze@gmail.com toby@uw.edu.
[Ti] Título:Competition between anthocyanin and flavonol biosynthesis produces spatial pattern variation of floral pigments between Mimulus species.
[So] Source:Proc Natl Acad Sci U S A;113(9):2448-53, 2016 Mar 01.
[Is] ISSN:1091-6490
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Flower color patterns have long served as a model for developmental genetics because pigment phenotypes are visually striking, yet generally not required for plant viability, facilitating the genetic analysis of color and pattern mutants. The evolution of novel flower colors and patterns has played a key role in the adaptive radiation of flowering plants via their specialized interactions with different pollinator guilds (e.g., bees, butterflies, birds), motivating the search for allelic differences affecting flower color pattern in closely related plant species with different pollinators. We have identified LIGHT AREAS1 (LAR1), encoding an R2R3-MYB transcription factor, as the causal gene underlying the spatial pattern variation of floral anthocyanin pigmentation between two sister species of monkeyflower: the bumblebee-pollinated Mimulus lewisii and the hummingbird-pollinated Mimulus cardinalis. We demonstrated that LAR1 positively regulates FLAVONOL SYNTHASE (FLS), essentially eliminating anthocyanin biosynthesis in the white region (i.e., light areas) around the corolla throat of M. lewisii flowers by diverting dihydroflavonol into flavonol biosynthesis from the anthocyanin pigment pathway. FLS is preferentially expressed in the light areas of the M. lewisii flower, thus prepatterning the corolla. LAR1 expression in M. cardinalis flowers is much lower than in M. lewisii, explaining the unpatterned phenotype and recessive inheritance of the M. cardinalis allele. Furthermore, our gene-expression analysis and genetic mapping results suggest that cis-regulatory change at the LAR1 gene played a critical role in the evolution of different pigmentation patterns between the two species.
[Mh] Termos MeSH primário: Antocianinas/biossíntese
Flavonóis/biossíntese
Mimulus/metabolismo
Pigmentos Biológicos/metabolismo
[Mh] Termos MeSH secundário: Sequência de Aminoácidos
Dados de Sequência Molecular
Proteínas de Plantas/química
Homologia de Sequência de Aminoácidos
Especificidade da Espécie
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, N.I.H., EXTRAMURAL; RESEARCH SUPPORT, NON-U.S. GOV'T; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.
[Nm] Nome de substância:
0 (Anthocyanins); 0 (Flavonols); 0 (Pigments, Biological); 0 (Plant Proteins)
[Em] Mês de entrada:1608
[Cu] Atualização por classe:170220
[Lr] Data última revisão:
170220
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:160218
[St] Status:MEDLINE
[do] DOI:10.1073/pnas.1515294113



página 1 de 18 ir para página                         
   


Refinar a pesquisa
  Base de dados : MEDLINE Formulário avançado   

    Pesquisar no campo  
1  
2
3
 
           



Search engine: iAH v2.6 powered by WWWISIS

BIREME/OPAS/OMS - Centro Latino-Americano e do Caribe de Informação em Ciências da Saúde