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| Registros recuperados: 103 | |
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| Arnhold, Emmanuel; Universidade Federal do Goiás (UFG); Milani, Klayton Flávio; Universidade Estatual de Maringá (UEM). |
| The coefficient of variation (CV) has been the most important statistic to determine the precision of experimental errors, but an even classification for guiding popcorn breeders is still lacking for popping expansion. The normality of data from 50 CVs was tested through the Shapiro-Wilk test, and the mean (m), median, standard deviation (SD), maximum and minimum values, asymmetry and kurtosis were all determined using the momentum method. The CVs were ranked as low [CV ≤ (m - 1 SD)], moderate [(m - 1 SD) < CV ≤ (m + 1 SD)], high [(m + 1 SD) < CV ≤ (m + 2 SD)] and very high [CV > (m + 2 SD)]. In summary, these data were close to the normality because the slight and flattened curve was skewed to the right. The CV’s mean was... |
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Palavras-chave: Zea mays; Dispersion measurement; Genetic improvement; Precision; Accuracy Zea mays; Dispersion measurement; Genetic improvement; Precision; Accuracy. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/11911 |
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| Oliveira, Sheila Nogueira; Universidade Estadual de Maringa; Ribeiro, Ricardo Pereira; Universidade Estadual de Maringa; Lopera, Nelson Mauricio; Universidade Estadual de Maringa; Candioto, Fernanda Braz; Universidade Estadual de Maringa; Resende, Emiko Kawakami; EMBRAPA; Legat, Angela Puchinik; EMBRAPA. |
| O objetivo deste trabalho foi analisar a diversidade genética de três gerações da tilápia GIFT do Programa de Melhoramento Genético da Universidade Estadual de Maringá, utilizando o marcador RAPD. Foram utilizadas 180 amostras de nadadeira. Os sete primers utilizados produziram 91 fragmentos, dos quais 98,9% foram polimórficos. Observaram-se diferenças (p < 0,05) na frequência de 64 fragmentos, dos quais dez foram excluídos na G2. Os resultados de variabilidade genética estimados pelo índice de Shannon (G0: 0,430; G1: 0,469 e G2: 0,420) e pela porcentagem de fragmentos polimórficos (G0: 90,1%; G1: 94,5% e G2: 86,8%) indicaram alta variabilidade genética intrapopulacional. Resultados esses que corroborando com os preceitos de diversidade genética de Nei... |
| Tipo: Analise laboratorial |
Palavras-chave: Produção Animal diversidade genética; Genetic Improvement of Farmed Tilapias; Linhagens; Melhoramento genético; Oreochromis niloticus Piscicultura genetic diversity; Genetic Improvement of Farmed Tilapias; Strains; Genetic improvement; Oreochromis niloticus. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/9202 |
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| Mendonça,Analucia Longman; Mariano,Rosa de Lima Ramos; Araújo,Janete Magali de; Cavalcante,Uided Maaze T.. |
| Forty-four Bacillus spp. strains obtained from sugar cane derivates and residues, six of them isolated in this work, were tested using Tween 80 as substrate (agar-Tween 80 medium), in order to determine their esterase activity through the enzymatic index averages. After statistic analysis, B. cereus (C124) strain, which presented better results, was submitted to genetic improvement by treatment with ultraviolet light (UV). The survival curve pointed out 28" as the time necessary to obtain 30% of survivors. Fifty survivors and the wild strain C124 were compared in relation to their esterase activity as mentioned previously. The wild strain and the mutant C124UV35, which showed enzymatic index average higher than C124, were characterized in polyacrilamide... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Bacteria; Genetic improvement; Bacillus spp.; B. cereus; Esterase. |
| Ano: 1998 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89131998000100011 |
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| Matus,Iván; Mellado,Mario; Pinares,Marcos; Madariaga,Ricardo; del Pozo,Alejandro. |
| Wheat (Triticum aestivum L.) is the major crop in terms of planted area and presents the largest distribution in the country covering a wide range of climatic regions. This study assesses the changes of various agronomic traits of winter wheat cultivars released in Chile between 1920 and 2000. A total of 117 winter accessions, representing 45 old and 72 modern cultivars were tested in a humid Mediterranean-type climate, with irrigation, in 2003. Old cultivars were those released before 1960 and modern ones were those released after 1960. Principal component (PC) analysis using 10 agronomic traits clearly separate modern from old cultivars of winter wheat. Comparing modern cultivars with old ones, plant height have been reduced by 25.6%, but others traits... |
| Tipo: Journal article |
Palavras-chave: Genetic improvement; Grain quality; Mediterranean environment; Old and new cultivars; Principal components; Yield progress. |
| Ano: 2012 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-58392012000300001 |
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| PEIXOTO,Joicy Vitória Miranda; GARCIA,Lismaíra Gonçalvez Caixeta; NASCIMENTO,Abadia dos Reis; MORAES,Emmerson Rodrigues de; FERREIRA,Tânia Aparecida Pinto de Castro; FERNANDES,Marinete Rocha; PEREIRA,Vanessa de Almeida. |
| Abstract The objective of this study was to characterize and select genotypes which displayed aptitude for genetic improvement for tomatoes consumed in natura as well as for those used in industrial processing. There were ten genotypes evaluated, being those from seven lines (CVR 1, CVR 3, CVR 4, CVR 5, CVR 8, CVR 21 and CVR 22) and three commercial hybrids (AP-533, SVR-0453 and Kátia) and analyzing the physicochemical characteristics of the produced fruits as: soluble solids rates, acidity in citric acid, total titratable acidity, soluble solids and total titratable acidity relation, pH, vitamin C, mass, transversal and longitudinal diameter and fruit firmness. In face of the analyzed characteristics, it was concluded that all genotypes produce fruits... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Solanum lycopersicum L.; Quality; Genetic improvement; Genotypes. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612018000200255 |
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| Barroso,Laís Mayara Azevedo; Nascimento,Moysés; Barili,Leiri Daiane; Nascimento,Ana Carolina Campana; Vale,Naine Martins do; Silva,Fabyano Fonseca e; Carneiro,José Eustáquio de Souza. |
| ABSTRACT: The aim of this study was to use quantile regression (QR) to characterize the effect of the adaptability parameter throughout the distribution of the productivity variable on black bean cultivars launched by different national research institutes (research centers) over the last 50 years. For this purpose, 40 cultivars developed by Brazilian genetic improvement programs between 1959 and 2013 were used. Initially, QR models were adjusted considering three quantiles (τ = 0.2, 0.5 and 0.8). Subsequently, with the confidence intervals, quantile models τ = 0.2 and 0.8 (QR0.2 and QR0.8) showed differences regarding the parameter of adaptability and average productivity. Finally, by grouping the cultivars into one of the two groups defined from QR0.2... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Gene-environment (GxE) interaction; Phaseolus vulgaris L; Genetic improvement; Quantiles; Regression models. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000300200 |
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| Santos,Laurenice Araujo dos; Silva,Simone Alves; Souza,Deoclides Ricardo de; Araujo,Gilmara de Melo; Almeida,Vanessa de Oliveira; Neves,Cláudia Garcia. |
| ABSTRACT: Knowledge on the variability and heritability of agronomic characters of interest aid the selection of superior materials. Thus, the objective of this study was to evaluate the genetic parameters of agronomic traits in castor bean plant lineages and to quantify the genetic correlations between them. The study was performed in the experimental area of the Federal University of the Recôncavo da Bahia, Cruz das Almas, Bahia. Seed oil content, vegetative cycle, plant height, and the number and weight of seeds per plant were evaluated in 47 lineages of castor bean seedlings. The coefficient of genetic variation was higher for weight of seeds per plant, revealing greater variability. The broad-sense heritability of individual plots presented a higher... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Castor bean plant; Genetic correlation; Heritability; Genetic improvement. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782019000100400 |
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| Hernández Leal, Enrique. |
| El presente trabajo se realizó con el objetivo de generar germoplasma base para investigación en mejoramiento genético de jitomate (Solanum lycopersicum L.) por selección e hibridación. Se partió de la selección de siete híbridos de jitomate, tipo saladette de hábito de crecimiento indeterminado, los cuales fueron evaluados bajo un diseño experimental de bloques completos al azar con cuatro repeticiones. Los criterios de selección fueron: el aspecto general y sanidad de la planta, el tamaño y forma de fruto, el número de racimos de fruto y el número de frutos por racimo. Se seleccionaron tres plantas de cada tratamiento y de cada genotipo; las plantas se evaluaron y se extrajo la semilla de los frutos de las plantas seleccionadas, para poder generar la... |
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Palavras-chave: Solanum lycopersicum; Germoplasma; Mejoramiento genético; Genética; Maestría; Germoplasm; Genetic improvement. |
| Ano: 2012 |
URL: http://hdl.handle.net/10521/1811 |
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| De Donato,Marcos; Ramirez,Raúl; Howell,Chris; Verginelli,Roberto; Orta,Tomás; Cabrera,Saúl; Mata,Enrique; Manrique,Ramón. |
| We investigated the effects of family selection on the growth rates of four genetic lines of Litopenaeus vannamei, the Pacific white shrimp, from Venezuela. The mean family weight at selection was 16.79 g and the mean growth rate was 0.169 g d-1 at a mean age of 138 days. The mean growth rates per generation were 0.141 g d-1 for the parental generation (P0), 0.173 g d-1 for the F1 and 0.191 g d-1 for the F2. Survival varied from 83.3% to 94.4%. There were statistically significant differences between lines, with lines B and C, growing at higher temperatures and lower salinities, showing the fastest growth. Regression analysis between growth rate and age for each genetic line showed high r² values, but smaller than those shown between growth rate and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Family selection; Genetic improvement; Growth rate; Litopenaeus vannamei. |
| Ano: 2008 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572008000500009 |
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| Homrich,Milena Schenkel; Wiebke-Strohm,Beatriz; Weber,Ricardo Luís Mayer; Bodanese-Zanettini,Maria Helena. |
| Transgenic plants represent an invaluable tool for molecular, genetic, biochemical and physiological studies by gene overexpression or silencing, transposon-based mutagenesis, protein sub-cellular localization and/or promoter characterization as well as a breakthrough for breeding programs, allowing the production of novel and genetically diverse genotypes. However, the stable transformation of soybean cannot yet be considered to be routine because it depends on the ability to combine efficient transformation and regeneration techniques. Two methods have been used with relative success to produce completely and stably transformed plants: particle bombardment and the Agrobacterium tumefaciens system. In addition, transformation by Agrobacterium rhizogenes... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Transgenic plants; Particle bombardment; Agrobacterium systems; Functional analysis; Genetic improvement. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572012000600015 |
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| Andrade Júnior,Valter C de; Guimarães,Amanda G; Firme,Tiago D; Costa,Aline Aparecida A; Costa,Márcia Regina da; Lopes,Thabata Karoline; Souza,Rovilson José de; Resende,Francisco V. |
| ABSTRACT Correlations and path analysis between characteristics can aid the selection of important attributes in breeding programs. Thus, the objective of this work was to perform genotypic, phenotypic correlations and path analysis under commercial yield of garlic bulbs, depending on morphological and agronomic variables. The experiment was carried out in 2017 at the Universidade Federal dos Vales do Jequitinhonha e Mucuri and Universidade Federal de Lavras, using ten garlic genotypes, eight trials and two commercial cultivars, Caçador and Jonas. We evaluated: plant height; number of leaves, total bulb number; total bulb mass, total bulb yield, marketable bulb yield and number of cloves per bulb. The genotypic and phenotypic correlations were positive and... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Allium sativum; Genetic improvement; Indirect selection. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362019000200204 |
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| Azevedo,Alcinei M; Silva,Derly José H da; Seus,Rogério; Freitas,Elis Marina de; Afonso,Daniel F; Gomes,Cristiane L; Aspiazú,Ignácio. |
| ABSTRACT Kale has a long vegetative cycle, requiring a lot of labor, due to the need for tutoring, thinning and multiple harvests, leading to difficulties in the maintenance and evaluation of experiments. Thus, the objective was to estimate the minimum number of evaluations for the assertive selection of half-sib progenies of kale by means of a repeatability study by Bayesian approach. Twenty four half-sib progenies were evaluated in a randomized block design with four replicates and five plants per plot. The number of shoots, number of marketable leaves, fresh mass of marketable leaves and fresh mass per leaf were measured throughout 15 harvests. All traits showed high estimates of the repeatability, indicating high regularity in the expression of the... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Brassica oleracea var. acephala; Repeatability; Genetic improvement; Production of leaves. |
| Ano: 2021 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362021000100020 |
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| Registros recuperados: 103 | |
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