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  1 / 1216 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


  2 / 1216 MEDLINE  
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[PMID]:29240818
[Au] Autor:Zhang X; Sun C; Zhang Z; Dai Z; Chen Y; Yuan X; Yuan Z; Tang W; Li L; Hu Z
[Ad] Endereço:Hunan Engineering & Technology Research Center for Agricultural Big Data Analysis & Decision-Making, Hunan Agricultural University, Changsha, Hunan, China.
[Ti] Título:Genetic dissection of main and epistatic effects of QTL based on augmented triple test cross design.
[So] Source:PLoS One;12(12):e0189054, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:The use of heterosis has considerably increased the productivity of many crops; however, the biological mechanism underpinning the technique remains elusive. The North Carolina design III (NCIII) and the triple test cross (TTC) are powerful and popular genetic mating design that can be used to decipher the genetic basis of heterosis. However, when using the NCIII design with the present quantitative trait locus (QTL) mapping method, if epistasis exists, the estimated additive or dominant effects are confounded with epistatic effects. Here, we propose a two-step approach to dissect all genetic effects of QTL and digenic interactions on a whole genome without sacrificing statistical power based on an augmented TTC (aTTC) design. Because the aTTC design has more transformation combinations than do the NCIII and TTC designs, it greatly enriches the QTL mapping for studying heterosis. When the basic population comprises recombinant inbred lines (RIL), we can use the same materials in the NCIII design for aTTC-design QTL mapping with transformation combination Z1, Z2, and Z4 to obtain genetic effect of QTL and digenic interactions. Compared with RIL-based TTC design, RIL-based aTTC design saves time, money, and labor for basic population crossed with F1. Several Monte Carlo simulation studies were carried out to confirm the proposed approach; the present genetic parameters could be identified with high statistical power, precision, and calculation speed, even at small sample size or low heritability. Additionally, two elite rice hybrid datasets for nine agronomic traits were estimated for real data analysis. We dissected the genetic effects and calculated the dominance degree of each QTL and digenic interaction. Real mapping results suggested that the dominance degree in Z2 that mainly characterize heterosis showed overdominance and dominance for QTL and digenic interactions. Dominance and overdominance were the major genetic foundations of heterosis in rice.
[Mh] Termos MeSH primário: Epistasia Genética
Locos de Características Quantitativas
[Mh] Termos MeSH secundário: Vigor Híbrido
Modelos Genéticos
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1801
[Cu] Atualização por classe:180116
[Lr] Data última revisão:
180116
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:171215
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0189054


  3 / 1216 MEDLINE  
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[PMID]:27778313
[Au] Autor:Spigler RB; Theodorou K; Chang SM
[Ad] Endereço:Department of Biology, Temple University, 1900 N. 12th Street, Philadelphia, Pennsylvania, 19122.
[Ti] Título:Inbreeding depression and drift load in small populations at demographic disequilibrium.
[So] Source:Evolution;71(1):81-94, 2017 01.
[Is] ISSN:1558-5646
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Inbreeding depression is a major driver of mating system evolution and has critical implications for population viability. Theoretical and empirical attention has been paid to predicting how inbreeding depression varies with population size. Lower inbreeding depression is predicted in small populations at equilibrium, primarily due to higher inbreeding rates facilitating purging and/or fixation of deleterious alleles (drift load), but predictions at demographic and genetic disequilibrium are less clear. In this study, we experimentally evaluate how lifetime inbreeding depression and drift load, estimated by heterosis, vary with census (N ) and effective (estimated as genetic diversity, H ) population size across six populations of the biennial Sabatia angularis as well as present novel models of inbreeding depression and heterosis under varying demographic scenarios at disequilibrium (fragmentation, bottlenecks, disturbances). Our experimental study reveals high average inbreeding depression and heterosis across populations. Across our small sample, heterosis declined with H , as predicted, whereas inbreeding depression did not vary with H and actually decreased with N . Our theoretical results demonstrate that inbreeding depression and heterosis levels can vary widely across populations at disequilibrium despite similar H and highlight that joint demographic and genetic dynamics are key to predicting patterns of genetic load in nonequilibrium systems.
[Mh] Termos MeSH primário: Genética Populacional
Gentianaceae/genética
Vigor Híbrido
Depressão por Endogamia
[Mh] Termos MeSH secundário: Carga Genética
Variação Genética
North Carolina
Densidade Demográfica
South Carolina
[Pt] Tipo de publicação:JOURNAL ARTICLE; RESEARCH SUPPORT, U.S. GOV'T, NON-P.H.S.; RESEARCH SUPPORT, NON-U.S. GOV'T
[Em] Mês de entrada:1709
[Cu] Atualização por classe:171130
[Lr] Data última revisão:
171130
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:161026
[St] Status:MEDLINE
[do] DOI:10.1111/evo.13103


  4 / 1216 MEDLINE  
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[PMID]:28953891
[Au] Autor:Yang J; Mezmouk S; Baumgarten A; Buckler ES; Guill KE; McMullen MD; Mumm RH; Ross-Ibarra J
[Ad] Endereço:Department of Plant Sciences, University of California, Davis, Davis, California, United States of America.
[Ti] Título:Incomplete dominance of deleterious alleles contributes substantially to trait variation and heterosis in maize.
[So] Source:PLoS Genet;13(9):e1007019, 2017 Sep.
[Is] ISSN:1553-7404
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Deleterious alleles have long been proposed to play an important role in patterning phenotypic variation and are central to commonly held ideas explaining the hybrid vigor observed in the offspring of a cross between two inbred parents. We test these ideas using evolutionary measures of sequence conservation to ask whether incorporating information about putatively deleterious alleles can inform genomic selection (GS) models and improve phenotypic prediction. We measured a number of agronomic traits in both the inbred parents and hybrids of an elite maize partial diallel population and re-sequenced the parents of the population. Inbred elite maize lines vary for more than 350,000 putatively deleterious sites, but show a lower burden of such sites than a comparable set of traditional landraces. Our modeling reveals widespread evidence for incomplete dominance at these loci, and supports theoretical models that more damaging variants are usually more recessive. We identify haplotype blocks using an identity-by-decent (IBD) analysis and perform genomic prediction analyses in which we weigh blocks on the basis of complementation for segregating putatively deleterious variants. Cross-validation results show that incorporating sequence conservation in genomic selection improves prediction accuracy for grain yield and other fitness-related traits as well as heterosis for those traits. Our results provide empirical support for an important role for incomplete dominance of deleterious alleles in explaining heterosis and demonstrate the utility of incorporating functional annotation in phenotypic prediction and plant breeding.
[Mh] Termos MeSH primário: Genes Dominantes
Genoma de Planta
Vigor Híbrido/genética
Zea mays/genética
[Mh] Termos MeSH secundário: Alelos
DNA de Plantas/genética
Genômica
Técnicas de Genotipagem
Haplótipos
Modelos Genéticos
Fenótipo
Melhoramento Vegetal
Polimorfismo de Nucleotídeo Único
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:1710
[Cu] Atualização por classe:171031
[Lr] Data última revisão:
171031
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170928
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pgen.1007019


  5 / 1216 MEDLINE  
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[PMID]:28708857
[Au] Autor:Zhang C; Lin C; Fu F; Zhong X; Peng B; Yan H; Zhang J; Zhang W; Wang P; Ding X; Zhang W; Zhao L
[Ad] Endereço:Soybean Research Institute, National Engineering Research Center for Soybean, Jilin Academy of Agricultural Sciences, Changchun, China.
[Ti] Título:Comparative transcriptome analysis of flower heterosis in two soybean F1 hybrids by RNA-seq.
[So] Source:PLoS One;12(7):e0181061, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Heterosis has been widely exploited as an approach to enhance crop traits during breeding. However, its underlying molecular genetic mechanisms remain unclear. Recent advances in RNA sequencing technology (RNA-seq) have provided an opportunity to conduct transcriptome profiling for heterosis studies. We used RNA-seq to analyze the flower transcriptomes of two F1 hybrid soybeans (HYBSOY-1 and HYBSOY-5) and their parents. More than 385 million high-quality reads were generated and aligned against the soybean reference genome. A total of 681 and 899 genes were identified as being differentially expressed between HYBSOY-1 and HYBSOY-5 and their parents, respectively. These differentially expressed genes (DEGs) were categorized into four major expression categories with 12 expression patterns. Furthermore, gene ontology (GO) term analysis showed that the DEGs were enriched in the categories metabolic process and catalytic activity, while Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis found that metabolic pathway and biosynthesis of secondary metabolites were enriched in the two F1 hybrids. Comparing the DEGs of the two F1 hybrids by GO term and KEGG pathway analyses identified 26 common DEGs that showed transgressive up-regulation, and which could be considered potential candidate genes for heterosis in soybean F1 hybrids. This identification of an extensive transcriptome dataset gives a comprehensive overview of the flower transcriptomes in two F1 hybrids, and provides useful information for soybean hybrid breeding. These findings lay the foundation for future studies on molecular mechanisms underlying soybean heterosis.
[Mh] Termos MeSH primário: Genoma de Planta
Vigor Híbrido/genética
RNA de Plantas/metabolismo
Feijão de Soja/genética
Transcriptoma
[Mh] Termos MeSH secundário: Regulação para Baixo
Flores/genética
Perfilação da Expressão Gênica
Fenótipo
RNA de Plantas/química
RNA de Plantas/isolamento & purificação
Reação em Cadeia da Polimerase em Tempo Real
Análise de Sequência de RNA
Feijão de Soja/metabolismo
Regulação para Cima
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (RNA, Plant)
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170927
[Lr] Data última revisão:
170927
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170715
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0181061


  6 / 1216 MEDLINE  
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[PMID]:28493991
[Au] Autor:Taliercio E; Eickholt D; Rouf R; Carter T
[Ad] Endereço:USDA-ARS, Raleigh, North Carolina United States of America.
[Ti] Título:Changes in gene expression between a soybean F1 hybrid and its parents are associated with agronomically valuable traits.
[So] Source:PLoS One;12(5):e0177225, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Soybean [Glycine max (L.) Merr.] genetic diversity is limited because domesticated soybean has undergone multiple genetic bottlenecks. Its progenitor, the wild soybean [Glycine soja Siebold & Zucc], has not undergone the same intense selection and is much more genetically diverse than domesticated soybean. However, the agronomic importance of diversity in wild soybean is unclear, and its weedy nature makes assessment difficult. To address this issue, we chose for study a highly selected, adapted F4-derived progeny of wild soybean, NMS4-44-329. This breeding line is derived from the hybridization between G. max cultivar N7103 and G. soja PI 366122. Agronomic comparisons were made among N7103, NMS4-44-329 and their F1 and F2 progeny in replicated yield trials at two North Carolina locations. Significant F1 mid-parent heterosis was observed at each location for seed yield (189 and 223 kgha-1, P<0.05 and P<0.10, respectively), seed protein content (1.1g/100g, P<0.01) and protein production per hectare (101 and 100 kgha-1, P<0.01 and P<0.06, respectively). Increased yield, seed protein content and protein production per hectare in the hybrids suggested that wild soybean has the potential to improve agronomic traits in applied breeding. Comparisons of differentially-expressed genes in the hybrid vs. parents identified genes associated with N metabolism. Non-additive changes in gene expression in the hybrids relative to the parents could reasonably explain the improved protein levels in the F1 hybrids. Changes in gene expression were influenced by environmental effects; however, allele specific bias in the hybrids were well correlated between environments. We propose that changes in gene expression, both additive and non-additive, and changes in allele specific expression bias may explain agronomic traits, and be valuable tools for plant breeders in the assessment of breeding populations.
[Mh] Termos MeSH primário: Expressão Gênica/genética
Locos de Características Quantitativas/genética
Feijão de Soja/genética
[Mh] Termos MeSH secundário: Cruzamento
Quimera
Meio Ambiente
Variação Genética/genética
Vigor Híbrido/genética
Hibridização Genética/genética
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1709
[Cu] Atualização por classe:170911
[Lr] Data última revisão:
170911
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170512
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0177225


  7 / 1216 MEDLINE  
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[PMID]:28419152
[Au] Autor:Holá D; Benesová M; Fischer L; Haisel D; Hnilicka F; Hnilicková H; Jedelský PL; Kocová M; Procházková D; Rothová O; Tumová L; Wilhelmová N
[Ad] Endereço:Department of Genetics and Microbiology, Faculty of Science, Charles University, Prague, Czech Republic.
[Ti] Título:The disadvantages of being a hybrid during drought: A combined analysis of plant morphology, physiology and leaf proteome in maize.
[So] Source:PLoS One;12(4):e0176121, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:A comparative analysis of various parameters that characterize plant morphology, growth, water status, photosynthesis, cell damage, and antioxidative and osmoprotective systems together with an iTRAQ analysis of the leaf proteome was performed in two inbred lines of maize (Zea mays L.) differing in drought susceptibility and their reciprocal F1 hybrids. The aim of this study was to dissect the parent-hybrid relationships to better understand the mechanisms of the heterotic effect and its potential association with the stress response. The results clearly showed that the four examined genotypes have completely different strategies for coping with limited water availability and that the inherent properties of the F1 hybrids, i.e. positive heterosis in morphological parameters (or, more generally, a larger plant body) becomes a distinct disadvantage when the water supply is limited. However, although a greater loss of photosynthetic efficiency was an inherent disadvantage, the precise causes and consequences of the original predisposition towards faster growth and biomass accumulation differed even between reciprocal hybrids. Both maternal and paternal parents could be imitated by their progeny in some aspects of the drought response (e.g., the absence of general protein down-regulation, changes in the levels of some carbon fixation or other photosynthetic proteins). Nevertheless, other features (e.g., dehydrin or light-harvesting protein contents, reduced chloroplast proteosynthesis) were quite unique to a particular hybrid. Our study also confirmed that the strategy for leaving stomata open even when the water supply is limited (coupled to a smaller body size and some other physiological properties), observed in one of our inbred lines, is associated with drought-resistance not only during mild drought (as we showed previously) but also during more severe drought conditions.
[Mh] Termos MeSH primário: Vigor Híbrido
Proteínas de Plantas/metabolismo
Zea mays/genética
Zea mays/fisiologia
[Mh] Termos MeSH secundário: Aclimatação
Quimera/genética
Quimera/fisiologia
Secas
Fotossíntese
Folhas de Planta/anatomia & histologia
Folhas de Planta/genética
Folhas de Planta/fisiologia
Proteínas de Plantas/análise
Proteoma/análise
Proteoma/metabolismo
Estresse Fisiológico
Água/metabolismo
Zea mays/anatomia & histologia
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Plant Proteins); 0 (Proteome); 059QF0KO0R (Water)
[Em] Mês de entrada:1705
[Cu] Atualização por classe:170505
[Lr] Data última revisão:
170505
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170419
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0176121


  8 / 1216 MEDLINE  
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[PMID]:28415964
[Au] Autor:Li H; Yang Q; Fan N; Zhang M; Zhai H; Ni Z; Zhang Y
[Ad] Endereço:State Key Laboratory for Agrobiotechnology and Key Laboratory of Crop Heterosis Utilization (MOE), China Agricultural University, Beijing, 100193, China.
[Ti] Título:Quantitative trait locus analysis of heterosis for plant height and ear height in an elite maize hybrid zhengdan 958 by design III.
[So] Source:BMC Genet;18(1):36, 2017 Apr 17.
[Is] ISSN:1471-2156
[Cp] País de publicação:England
[La] Idioma:eng
[Ab] Resumo:BACKGROUND: Plant height (PH) and ear height (EH) are two important agronomic traits in maize selection breeding. F hybrid exhibit significant heterosis for PH and EH as compared to their parental inbred lines. To understand the genetic basis of heterosis controlling PH and EH, we conducted quantitative trait locus (QTL) analysis using a recombinant inbreed line (RIL) based design III population derived from the elite maize hybrid Zhengdan 958 in five environments. RESULTS: A total of 14 environmentally stable QTLs were identified, and the number of QTLs for Z and Z populations was six and eight, respectively. Notably, all the eight environmentally stable QTLs for Z were characterized by overdominance effect (OD), suggesting that overdominant QTLs were the most important contributors to heterosis for PH and EH. Furthermore, 14 environmentally stable QTLs were anchored on six genomic regions, among which four are trait-specific QTLs, suggesting that the genetic basis for PH and EH is partially different. Additionally, qPH.A-1.3, modifying about 10 centimeters of PH, was further validated in backcross populations. CONCLUSIONS: The genetic basis for PH and EH is partially different, and overdominant QTLs are important factors for heterosis of PH and EH. A major QTL qPH.A-1.3 may be a desired target for genetic improvement of maize plant height.
[Mh] Termos MeSH primário: Vigor Híbrido/genética
Plantas Geneticamente Modificadas/genética
Locos de Características Quantitativas
Zea mays/genética
[Mh] Termos MeSH secundário: Mapeamento Cromossômico
Ligação Genética
Genótipo
Repetições de Microssatélites
Fenótipo
Plantas Geneticamente Modificadas/metabolismo
Zea mays/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1704
[Cu] Atualização por classe:170426
[Lr] Data última revisão:
170426
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170419
[St] Status:MEDLINE
[do] DOI:10.1186/s12863-017-0503-9


  9 / 1216 MEDLINE  
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[PMID]:28257492
[Au] Autor:Montanari SR; Hobbs JA; Pratchett MS; Bay LK; van Herwerden L
[Ad] Endereço:AIMS@JCU, Australian Institute of Marine Science, College of Science and Engineering, James Cook University of North Queensland, Townsville, QLD, Australia.
[Ti] Título:Naturally occurring hybrids of coral reef butterflyfishes have similar fitness compared to parental species.
[So] Source:PLoS One;12(3):e0173212, 2017.
[Is] ISSN:1932-6203
[Cp] País de publicação:United States
[La] Idioma:eng
[Ab] Resumo:Hybridisation can produce evolutionary novelty by increasing fitness and adaptive capacity. Heterosis, or hybrid vigour, has been documented in many plant and animal taxa, and is a notable consequence of hybridisation that has been exploited for decades in agriculture and aquaculture. On the contrary, loss of fitness in naturally occurring hybrid taxa has been observed in many cases. This can have negative consequences for the parental species involved (wasted reproductive effort), and has raised concerns for species conservation. This study evaluates the relative fitness of previously documented butterflyfish hybrids of the genus Chaetodon from the Indo-Pacific suture zone at Christmas Island. Histological examination confirmed the reproductive viability of Chaetodon hybrids. Examination of liver lipid content showed that hybrid body condition was not significantly different from parent species body condition. Lastly, size at age data revealed no difference in growth rates and asymptotic length between hybrids and parent species. Based on the traits measured in this study, naturally occurring hybrids of Chaetodon butterflyfishes have similar fitness to their parental species, and are unlikely to supplant parental species under current environmental conditions at the suture zone. However, given sufficient fitness and ongoing genetic exchange between the respective parental species, hybrids are likely to persist within the suture zone.
[Mh] Termos MeSH primário: Evolução Biológica
Vigor Híbrido/genética
Hibridização Genética
Perciformes/genética
[Mh] Termos MeSH secundário: Animais
Recifes de Corais
Lipídeos/isolamento & purificação
Fígado/química
Perciformes/crescimento & desenvolvimento
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Nm] Nome de substância:
0 (Lipids)
[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:170304
[St] Status:MEDLINE
[do] DOI:10.1371/journal.pone.0173212


  10 / 1216 MEDLINE  
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[PMID]:28252169
[Au] Autor:Poltronieri TP; Silveira SF; Vivas M; Santa Catarina R; Cortes DF; Azevedo AO; Pereira MG
[Ad] Endereço:Laboratório de Entomologia e Fitopatologia, Universidade Estadual do Norte Fluminense Darcy Ribeiro, Campos dos Goytacazes, RJ, Brasil tathianne_pastana@hotmail.com.
[Ti] Título:Selecting black-spot resistant papaya genotypes derived from backcrossing and hybrids.
[So] Source:Genet Mol Res;16(1), 2017 Feb 23.
[Is] ISSN:1676-5680
[Cp] País de publicação:Brazil
[La] Idioma:eng
[Ab] Resumo:Papaya crop is important to Brazilian agribusiness. However, the expansion of papaya cultivation in the country is affected by the absence of commercial cultivars presenting good disease resistance. The black-spot caused by the fungus Asperisporium caricae is the most damaging foliar disease affecting Brazilian papaya crops. The use of genetically resistant cultivars is a promising strategy to reduce the dependence of papaya crops on fungicides. A field split-plot experiment was carried out in the municipality of Linhares, Espírito Santo State, and included 20 hybrids derived from the cross between 14 superior lines and four elite genotypes ('SS72/12', 'SEKATI', 'JS/12' and '41/7'), two commercial cultivars ('Golden' and 'Tainung 01'), and the superior line '36/7', which were evaluated for resistance to black-spot in the fruits and leaves. The treatments were arranged in a randomized block design with six repetitions of three plants per plot. The incidence and severity of black spot in the fruits and leaves were evaluated at three different times in the 2015-2016 crop season. Lines 4, 9, 21, and the parent SEKATI were notable for their capacity to reduce disease severity in the leaves and fruits. Lines 1, 2, 9, 16, and 19, and the parents 'SEKATI' and 'SS-72/12' had reduced disease incidence in their fruits. The most resistant hybrids 'SS-72/12 X 4', 'SS-72/12 X 6', 'SEKATI X 1', 'SEKATI X 2', 'SEKATI X 6', 'SEKATI X 9', and 'SEKATI X 20' presented negative heterosis values for improved black-spot resistance. The current study allowed the selection of black-spot resistant genotypes and hybrids, which presented a significantly reduced disease index in the field.
[Mh] Termos MeSH primário: Carica/genética
Produtos Agrícolas/genética
Resistência à Doença/genética
Melhoramento Vegetal/métodos
Doenças das Plantas/genética
[Mh] Termos MeSH secundário: Ascomicetos/fisiologia
Brasil
Carica/microbiologia
Produtos Agrícolas/microbiologia
Frutas/genética
Frutas/microbiologia
Genótipo
Vigor Híbrido/genética
Hibridização Genética
Endogamia
Doenças das Plantas/microbiologia
Folhas de Planta/genética
Folhas de Planta/microbiologia
Reprodutibilidade dos Testes
[Pt] Tipo de publicação:JOURNAL ARTICLE
[Em] Mês de entrada:1703
[Cu] Atualização por classe:170317
[Lr] Data última revisão:
170317
[Sb] Subgrupo de revista:IM
[Da] Data de entrada para processamento:170303
[St] Status:MEDLINE
[do] DOI:10.4238/gmr16019401



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