Jefferson Luís Meirelles Coimbra

Universidade do Estado de Santa Catarina

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Trends

Author Order

Document Type

Co-Authors

Altamir Frederico Guidolin

Universidade do Estado de Santa Catarina

124

Rita Carolina de Melo

Universidade Federal de Santa Catarina

Juliano Garcia Bertoldo

Empresa de Pesquisa Agropecuária do Rio Grande do Norte

Fernando Irajá Félix de Carvalho

Universidade Estadual do Oeste do Paraná

Paulo Henrique Cerutti

Universidade do Estado de Santa Catarina

Naine Martins do Vale

Universidade Federal de Viçosa

Antônio Costa de Oliveira

Universidade Federal de Pelotas

Nicole Trevisani

University Alto Vale do Rio do Peixe

Fabiani da Rocha

Corteva (United States)

Maurício Marini Köpp

Brazilian Agricultural Research Corporation

Cooperative Institutions

Universidade do Estado de Santa Catarina

117

Universidade Federal de Pelotas

Brazilian Agricultural Research Corporation

Universidade Federal de Santa Catarina

Empresa de Pesquisa Agropecuária e Extensão Rural de Santa Catarina

Universidade de São Paulo

Universidade Federal de Viçosa

Universidade Federal de Santa Maria

National Council for Scientific and Technological Development

Universidade Federal do Paraná

Author Statistics

Papers

Citation

H-Index

i-10 index

Research Field

Esperanças matemáticas dos quadrados médios: uma análise essencial

Ciência Rural (2006)

Jefferson Luís Meirelles Coimbra Velci Queiróz de Souza Maurício Marini Köpp João Gilberto Corrêa da Silva Antônio Costa de Oliveira

Este trabalho teve como objetivo avaliar e identificar qual o tipo de soma de quadrados mais apropriada para testar hipóteses de interesse, assim como discutir alternativas mais adequadas para a solução de inconvenientes expressos por meio da análise da esperança matemática dos quadrados médios utilizados em modelos lineares mistos. A análise das esperanças matemáticas dos quadrados médios pode ser uma ferramenta de grande importância nas inferências a partir de dados experimentais, tanto incompletos (casela vazia) quanto não-balanceados. Desta forma, foram utilizados quatro exemplos, cada qual com sua peculiaridade em função do experimento ser completo ou incompleto com dados balanceados ou não-balanceados e na presença de casela vazia. O pacote estatístico SAS, versão Learning Edition, foi empregado para analisar os experimentos. O resultado da análise das esperanças matemáticas dos quadrados médios indicou que a soma de quadrados do tipo I somente apresentou condições de ser utilizada em presença de dados completamente balanceados. De modo contrário, os resultados apontam que a soma de quadrados tipo III é a soma de quadrados mais apropriada no caso de dados não-balanceados. As somas de quadrados tipo II e IV são as mais importantes no caso de caselas vazias, fato que corrobora a necessidade de avaliar sempre as esperanças matemáticas dos quadrados médios.

10.1590/s0103-84782006000600010

Cite

Citations (7)

Agronomic potential of genebank landrace elite accessions for common bean genetic breeding

Scientia Agricola (2014)

Juliano Garcia Bertoldo Jefferson Luís Meirelles Coimbra Altamir Frederico Guidolin Luciano Rogério Braatz de Andrade Rubens Onofre Nodari

Plant breeding efficiency relies mainly on genetic diversity and selection to release new cultivars. This study aimed to identify landraces with favorable characteristics that can be used as parents of segregating populations in common bean (Phaseolus vulgaris L.) breeding programs. Firstly, ten bean genotypes were selected because they showed promising agronomic performance, and the following seven adaptive traits of four commercial bean cultivars were evaluated: i) plant height; ii) diameter of the stem; iii) height of the insertion of the first pod; iv) pod number per plant; v) grain number per pod; vi) weight of a thousand grains and vii) grain yield. The accessions BAF 07, BAF 44, and BAF 45 are promising in terms of increasing plant height, and accession BAF 01, in terms of reducing plant height. The accession BAF 07 was also the most promising in terms of a plant ideotype that combines higher plant height, maximum height of the insertion of the first pod, and increment in grain yield. Moreover, the selection can be made between and within accessions, because genetic variability is also present within landraces.

Plant Breeding

10.1590/s0103-90162014000200005

Cite

Citations (25)

Prediction of genetic value in F3 populations of Avena sativa L. using Reml/Blup

Crop Breeding and Applied Biotechnology (2005)

Jefferson Luís Meirelles Coimbra Maurício Marini Köpp Velci Queiróz de Souza G. Benin Volmir Sérgio Marchioro

In genetics and breeding studies it is common to conduct experiments of fixed (sowing method) and random (populations) factors. Therefore, the most appropriate statistic analyses would use mixed linear models. In this sense, objectives of this work were i) to estimate the variance components for the random factor effects and interaction population x sowing method; ii) to perform selection among populations and among populations in each sowing method; iii) to compare the effect of the fixed factor. Both the effect of components of the population variance as well as the effect of the single interaction population x sowing methods revealed low contributions to the total variance. It can therefore be concluded that segregating populations present narrow genotypic variability. The Reml/Blup procedure is indicated for estimation/prediction in oat improvement where experiments generally produce unbalanced data.

Restricted maximum likelihood

Avena

Mixed model

Variance components

10.12702/1984-7033.v05n03a02

Cite

Citations (5)

CRIAÇÃO DE VARIABILIDADE GENÉTICA NO CARÁTER ESTATURA DE PLANTA EM AVEIA: HIBRIDAÇÃO ARTIFICIAL x MUTAÇÃO INDUZIDA

Current Agricultural Science and Technology (2012)

Antônio Costa de Oliveira Jefferson Luís Meirelles Coimbra Fernando Carvalho Altamir Frederico Guidolin

Tecnicas que ampliam o background da cultura de aveia possibilitam que programas de melhoramento genetico possam manipular as fontes de germoplasma de aveia ( Avena sativa ). Frequentemente, estas tecnicas viabilizam o sucesso do programa de melhoramento genetico vegetal. As tecnicas utilizadas foram cruzamentos artificiais e mutacoes induzidas. O objetivo desse trabalho foi avaliar o efeito das mutacoes induzidas e cruzamentos em populacoes segregantes para o carater estatura de planta. As populacoes foram obtidas a partir de cruzamentos reciprocos e mutacoes induzidas, pelo uso do agente mutagenico etilmetanossulfonato (EMS) nas doses 0 ; 0,5; 1,5 e 3,0%, sendo avaliadas as variacoes ocorridas no carater estatura de planta, atraves das medias, variâncias, assimetria e curtose em quatro genotipos fixos de aveia hexaploide (CTC-3, UFRGS-10, UFRGS-14 e UPF-16). Os resultados obtidos revelaram populacoes com profunda segregacao para o carater estatura de planta, com classes fenotipicas bem distintas e, a possibilidade de identificar populacoes com valores distintos, comparativamente, com o padrao nos quatro genotipos avaliados. De modo geral, a tecnica de mutacao induzida foi mais eficiente na alteracao do carater, comparativamente aos cruzamentos artificiais. O mutagenico EMS na geracao M 2 incrementou o carater estatura de planta em doses mais baixas; o contrario do obtido quando empregadas doses mais elevadas.

10.18539/cast.v10i3.957

Cite

Citations (1)

COEFICIENTES DE TRILHA, CORRELAÇÕES CANÓNICAS E DIVERGÊNCIA GENÉTICA: I. ENTRE CARACTERES PRIMÁRIOS E SECUNDÁRIOS DO RENDIMENTO DE GRÃOS EM GENÓTIPOS DE FEIJÃO PRETO (Phaseolus vulgaris L.)

DOAJ (DOAJ: Directory of Open Access Journals) (1998)

Jefferson Luís Meirelles Coimbra Altamir Frederico Guidolin Fernando Irajá Félix de Carvalho

Twenty tive black beans genotypes were evaluated in Lages, Santa Catarina, studying the influence of seven characters of agronomic importance on the grain production per unit arca. The experiment, in randomized blocks with thrce replications per treatment, was conducted in the growing season 1995/96 (November - January) . The objectives of this work were: I ) estimate the direct and indirect effects among the characters of agronomic importance, through path analysis; 2) estimate the association intcnsity between primary and secondary components of grain yield; 3) estimate the genetic divergence of twenty-five black bean genotypes, using Mahalanobis statistics. The first group of variables (primary components) was composed by the number of pods per plant, 1000 grains weight, and number of grains per pod; the second group (secondary components), by the number of days from emergency to flowering, number of days, from emergency to harvesting point, plant height and first pod insertion (cm). The canonical correlations analysis showed the influence of the secondary components over the primary ones. Thc path analysis showed the importante of 1000 grains weight, number of pods per plant, and number of grains per pod, presenting the largest direct effects and high phenotypic correlation with grain yield. The Mahalanobis analysis made possible to discriminate black bean genotypes regarding their degree of genetic similarity. It was also evidenced a wide genetic variability for all the evaluated characters, especially for the vegetative cycle, number of pods per plant and number of grains per pod. The use of distant genotypes in bean breeding programs, which use artificial hybridization to increase genetic variability, certainly would not lead to the narrowing of the genetic basis, since a wide genetic variability is found among black bean genotypes.

Mahalanobis distance

Path coefficient

Genetic divergence

Source

Cite

Citations (7)

Phenotypical changes in hop induced by micropropagation

Plant Cell Tissue and Organ Culture (PCTOC) (2021)

Rúbia de Souza Cristiane Rosa Adams Rita Carolina de Melo Altamir Frederico Guidolin Adriano Michel

Somaclonal variation

Plantlet

Humulus lupulus

10.1007/s11240-021-02130-2

Cite

Citations (5)

Organic acid tolerance in M3 families of oat mutants

Crop Breeding and Applied Biotechnology (2007)

Maurício Marini Köpp Jefferson Luís Meirelles Coimbra V.K. Luz Rogério Oliveira de Sousa Fernando Irajá Félix de Carvalho

10.12702/1984-7033.v07n01a09

Cite

Citations (15)

Salivary β-glucosidase as a direct factor influencing the occurrence of halitosis

Biochemistry and Biophysics Reports (2021)

Lucimari Teixeira Essenfelder Anderson Gomes Jefferson Luís Meirelles Coimbra Marcelo Alves Moreira Sandra Maria Ferraz

β-Glucosidases are enzymes present in all living organisms, playing a pivotal role in diverse biological processes. These enzymes cleave β-glycosidic bonds between carbohydrates, or between a carbohydrate and a non-carbohydrate moiety, which may result in the liberation of volatile aglycones. Released compounds execute diverse physiological roles, while the industry takes advantage of exogenously added β-glucosidases for aroma enrichment during food and beverage production. β-Glucosidase enzymatic activity has been reported in human saliva and given the fact that these enzymes are involved in aroma release, we investigated here the correlation between β-glucosidase activity in human saliva and the occurrence of halitosis. Measurement of salivary enzyme activity of 48 volunteers was performed using p-nitrophenyl-β-d-glucopyranoside as substrate. Each volunteer was clinically evaluated by a dental surgeon and clinical and laboratorial data were statistically analyzed. Gas-chromatography of saliva headspace allowed the analysis of the direct role of exogenous β-glucosidase on aromatic /volatile profile of saliva samples. The data demonstrated a positive correlation between halitosis and enzymatic activity, suggesting that the enzyme exerts a direct role in the occurrence of bad breath. Gas-chromatography analysis demonstrated that exogenously added enzyme led to the alteration of volatile organic content, confirming a direct contribution of β-glucosidase activity on saliva volatile compounds release. Although halitosis is a multifactorial condition, the complete understanding of all governing factors may allow the development of more effective treatment strategies. Such studies may pave the way to the use of β-glucosidase inhibitors for halitosis clinical management.

Glycosidic bond

Glucosidases

Liberation

10.1016/j.bbrep.2021.100965

Cite

Citations (4)

Multivariate screening among black beans accessions to participation in crossing blocks

DOAJ (DOAJ: Directory of Open Access Journals) (2011)

Diego Stähelin Giseli Valentini Luciano Rogério Braatz de Andrade Mario Alvaro Aloisio Veríssimo Juliano Garcia Bertoldo

Source

Cite

Citations (0)

Combining ability between common bean gene groups for root distribution trait

Figshare (2021)

Paulo Henrique Cerutti Sibila Grigolo Rita Carolina de Melo Ana Carolina da Costa Lara Fioreze Altamir Frederico Guidolin

ABSTRACT When different gene groups are combined by hybridization, the expression of predominant genes for a trait must be known. This understanding is fundamental to the decisions made by breeders in the stages of cultivation and selection of segregating populations during the breeding program. Thus, the objective of this study was to determine the effects of combining ability and gene action for the root distribution traits of the Andean and Mesoamerican common bean gene groups. Six common bean parents from the Andean and Mesoamerican groups were hybridized in a complete diallel mating scheme, resulting in 30 F1 hybrids. The parents and hybrids were planted in the field in a simple lattice design. The target trait was root distribution, calculated as the relative number of roots in the topsoil. The effect of the general combining ability was significantly higher than that of the specific combining ability (58%) and the reciprocal effect (41%). Particularly, the combination estimates were modified according to the order of the gene groups used. The combinations IPR Uirapuru x BAF53 (Mesoamerican x Andean), BAF53 x CBS14 (Andean x Andean), and CBS14 x IPR Uirapuru (Andean x Mesoamerican) mainly exhibited an increase in the mean root distribution. However, the highest fraction of genetic variance correlated with additive components (60%), even in crosses involving different gene groups. Consequently, the additive gene action was predominant in the expression of root distribution trait in common bean, irrespective of the gene group used.

Trait

Root (linguistics)

10.6084/m9.figshare.14283840

Cite

Citations (0)