Research Article

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01/21/2014
Genetic improvement; Recurrent selection; Selection index; Zea mays

The popcorn breeding program of Universidade Estadual do Norte Fluminense Darcy Ribeiro aims to provide farmers a cultivar with desirable agronomic traits, particularly with respect to grain yield (GY) and popping expansion (PE). We evaluated full-sib families from the seventh cycle of recurrent selection and estimated the genetic progress with respect to GY and PE. Eight traits were ... more

I.L.J. Freitas; A.Tdo Amaral Júnior; S.P. Freitas; P.D.S. Cabral; R.M. Ribeiro; L.S.A. Gonçalves
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Body structure; Frame scores; Genetic improvement; Genetic parameters; Nellore

Models for estimation of frame scores in Nellore beef cattle (FRAME_GMA) were developed, comparing them with frame scores estimated using equations proposed by the Beef Improvement Federation (FRAME_BIF, USA). Correlation among frame scores obtained by these two methodologies, along with the independent variables considered in the estimation models, were also studied. A data set with 12,728 ... more

A.R.V.R. Horimoto; J.B.S. Ferraz; J.C.C. Balieiro; J.P. Eler
08/11/2009
Allelic interactions; diallel analysis; Epistasis; Genetic improvement; Heterozygosity; Over-dominance

Isabgol is a medicinal plant known for its high-quality dietary fiber. The genetics and inheritance of economic characters, such as number of panicles, panicle length, seed yield, and swelling factor, were measured by diallel analysis of F1 progenies from seven parents. The additive component of genetic variance was significant for days to flowering, plant height, branches/plant, peduncle ... more

N. Singh; R.K. Lal
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Forage; Genetic improvement; Plant resistance

An understanding of the interaction between spittlebugs and forage grasses is essential for establishing factors that favor productive pastures. In the present study, we evaluated the protein profiles of the spittle of Mahanarva spectabilis (Distant, 1909) (Hemiptera: Cercopidae) fed various elephant grass genotypes. Each plant was infested with a single fifth-instar M. ... more

A.M. Auad; M.F. Martins; I. Fonseca; S.V. Paula-Moraes; M.M. Kopp; M.C. Cordeiro
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Genetic improvement; Plant breeding; Selection efficiency

The objective of this study was to compare the BLUP selection method with different selection strategies in F2:4 and assess the efficiency of this method on the early choice of the best common bean (Phaseolus vulgaris) lines. Fifty-one F2:4 progenies were produced from a cross between the CVIII8511 x RP-26 lines. A randomized block design was used with 20 ... more

M.P. Mendes; M.A.P. Ramalho; A.F.B. Abreu
08/28/2014
Genetic improvement; Honeybee queen selection; Major royal jelly proteins; mrjp3; Polymorphism

It is important to select the best honeybees that produce royal jelly to identify important molecular markers, such as major royal jelly proteins (MRJPs), and hence contribute to the development of new breeding strategies to improve the production of this substance. Therefore, this study focused on evaluating the genetic variability of mrjp3, mrjp5, and mrjp8 ... more

R.S. Parpinelli; M.C.C. Ruvolo-Takasusuki; V.A.A. Toledo
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Genetic improvement; Multi-diverse analysis; Saccharum

This study evaluated different strategies to select sugar cane families and obtain clones adapted to the conditions of the Brazilian savannah. Specifically, 7 experiments were conducted, with 10 full sib families, and 2 witnesses in common to all experiments, in each experiment. The plants were grown in random blocks, with witnesses in common (incomplete blocks), and 6 repetitions of each ... more

M.H.P. Barbosa; A. Ferreira; L.A. Peixoto; M.D.V. Resende; M. Nascimento; F.F. Silva
07/19/2012
Genetic diversity; Microsatellite; Molecular breeding; Popcorn; SSR locus; Zea mays

We analyzed genetic structure and diversity among eight populations of popcorn, using SSR loci as genetic markers. Our objectives were to select SSR loci that could be used to estimate genetic diversity within popcorn populations, and to analyze the genetic structure of promising populations with high levels of heterozygosity that could be used in breeding programs. Fifty-seven alleles (3 ... more

I.B.O. Eloi; C.A. Mangolin; C.A. Scapim; C.S. Gonçalves; M.F.P.S. Machado
05/15/2012
Full-sibling families; Genetic gains; Selection index; Zea mays

As part of the Universidade Estadual do Norte Fluminense recurrent selection program of popcorn, we evaluated full-sib families of the sixth cycle of recurrent selection and estimated genetic progress for grain yield and expansion capacity. We assessed 200 full-sib families for 10 agronomic traits, in a randomized block design, with two replications within sets in two environments: Campos ... more

R.M. Ribeiro; A.Tdo Amaral Júnior; L.S.A. Gonçalves; L.S. Candido; T.R.C. Silva; G.F. Pena
03/29/2007
CEIP; Frame scores; Genetic and phenotypic correlation; Genetic improvement; Nellore; Weight

The present study was carried out to estimate both (co)variance components and genetic parameters for frame scores obtained using two methods (FRAME_GMA and FRAME_BIF) as well as phenotypic and genetic correlations with traits such as weaning weight, weight gain from weaning to yearling, scrotal circumference, muscle score, and an empiric index for animal classification for the Special ... more

A.R.V.R. Horimoto; J.B.S. Ferraz; J.C.C. Balieiro; J.P. Eler

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