18 documents found, page 1 of 2
Diversity among elephant grass genotypes using Bayesian multi-trait model
Rossi, D.A.; Daher, R.F.; Barbé, T.C.; Lima, R.S.N.; Costa, A.F.; Ribeiro, L.P.; Teodoro, P.E.; Bhering, L.L.Elephant grass is a perennial tropical grass with great potential for energy generation from biomass. The objective of this study was to estimate the genetic diversity among elephant grass accessions based on morpho-agronomic and biomass quality traits and to identify promising genotypes for obtaining hybrids with high energetic biomass production capacity. The experiment was installed at experimental area of t...
Estimates of repeatability coefficients and the number of the optimum measure t...
Sanchéz, C.F.B.; Alves, R.S.; Garcia, A.D.P.; Teodoro, P.E.; Peixoto, L.A.; Silva, L.A.; Bhering, L.L.; Resende, M.D.V.The aim of this study was to evaluate repeated measures over the years to estimate repeatability coefficient and the number of the optimum measure to select superior genotypes in Annona muricata L. The fruit production was evaluated over 16 years in 71 genotypes without an experimental design. The estimation of variance components and the prediction of the permanent phenotypic value were performed using REML/BL...
Superiority of artificial neural networks for a genetic classification procedure
Sant’Anna, I.C.; Tomaz, R.S.; Silva, G.N.; Nascimento, M.; Bhering, L.L.; Cruz, C.D.The correct classification of individuals is extremely important for the preservation of genetic variability and for maximization of yield in breeding programs using phenotypic traits and genetic markers. The Fisher and Anderson discriminant functions are commonly used multivariate statistical techniques for these situations, which allow for the allocation of an initially unknown individual to predefined groups...
Selection of strawberry cultivars with tolerance to Tetranychus urticae (Acari:...
Costa, A.F.; Teodoro, P.E.; Bhering, L.L.; Fornazier, M.J.; Andrade, J.S.; Martins, D.S.; Zanuncio Junior, J.S.Tetranychus urticae Koch (Acari: Tetranychidae) is considered the main pest of strawberry. Several factors can favor its development, among them the genotype susceptibility and cropping system. The aims of this study were to evaluate the agronomic performance of strawberry cultivars under different managements and to identify strawberry cultivars that meet tolerance to T. urticae and high fruit yield. Thirteen ...
Multivariate diallel analysis allows multiple gains in segregating populations ...
Teodoro, P.E.; Rodrigues, E.V.; Peixoto, L.A.; Silva, L.A.; Laviola, B.G.; Bhering, L.L.Jatropha is research target worldwide aimed at large-scale oil production for biodiesel and bio-kerosene. Its production potential is among 1200 and 1500 kg/ha of oil after the 4th year. This study aimed to estimate combining ability of Jatropha genotypes by multivariate diallel analysis to select parents and crosses that allow gains in important agronomic traits. We performed crosses in diallel complete geneti...
Minimum number of measurements for evaluating soursop (Annona muricata L.) yield
Sánchez, C.F.B.; Teodoro, P.E.; Londoño, S.; Silva, L.A.; Peixoto, L.A.; Bhering, L.L.Repeatability studies on fruit species are of great importance to identify the minimum number of measurements necessary to accurately select superior genotypes. This study aimed to identify the most efficient method to estimate the repeatability coefficient (r) and predict the minimum number of measurements needed for a more accurate evaluation of soursop (Annona muricata L.) genotypes based on fruit yield. Six...
Selecting sugarcane genotypes by the selection index reveals high gain for tech...
Silva, L.A.; Teodoro, P.E.; Peixoto, L.A.; Assis, C.; Gasparini, K.; Barbosa, M.H.P.; Bhering, L.L.Sugarcane (Saccharum sp) is one of the most promising crops and researchers have sought for renewable alternative energy sources to reduce CO2 emission. The study of strategies, which allow breeders in the selection of superior genotypes for many traits simultaneously, is important. Therefore, the objectives of this study were: i) to apply path analysis to better understand the relationship between the lignocel...
Biplot analysis of strawberry genotypes recommended for the State of Espírito S...
Costa, A.F.; Teodoro, P.E.; Bhering, L.L.; Leal, N.R.; Tardin, F.D.; Daher, R.F.Most strawberry genotypes grown commercially in Brazil originate from breeding programs in the United States, and are therefore not adapted to the various soil and climatic conditions found in Brazil. Thus, quantifying the magnitude of genotype x environment (GE) interactions serves as a primary means for increasing average Brazilian strawberry yields, and helps provide specific recommendations for farmers on w...
Molecular analysis of genetic diversity among vine accessions using DNA markers.
Costa, A.F. da; Teodoro, P.E.; Bhering, L.L.; Tardin, F.D.; Daher, R.F.; Campos, W.F.; Viana, A.P.; Pereira, M.G.Viticulture presents a number of economic and social advantages, such as increasing employment levels and fixing the labor force in rural areas. With the aim of initiating a program of genetic improvement in grapevine from the State University of the state of Rio de Janeiro North Darcy Ribeiro, genetic diversity between 40 genotypes (varieties, rootstock, and species of different subgenera) was evaluated using ...
Mixed models for selection of Jatropha progenies with high adaptability and yie...
Teodoro, P.E.; Bhering, L.L.; Costa, R.D.; Rocha, R.B.; Laviola, B.G.The aim of this study was to estimate genetic parameters via mixed models and simultaneously to select Jatropha progenies grown in three regions of Brazil that meet high adaptability and stability. From a previous phenotypic selection, three progeny tests were installed in 2008 in the municipalities of Planaltina-DF (Midwest), Nova Porteirinha-MG (Southeast), and Pelotas-RS (South). We evaluated 18 families of ...