Research Article

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Knowledge of genetic diversity among genotypes and relationships among elite lines is of great importance for the development of breeding programs. Therefore, the objective of this study was to evaluate genetic variability based on the morphoagronomic and molecular characterization of 18 elite popcorn (Zea mays var. everta) lines to be used by Universidade Estadual de Maringá breeding programs ... more

J.F.Dos Santos; C.A. Mangolin; M.F.P.S. Machado; C.A. Scapim; W. Giordani; L.S.A. Gonçalves
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Droughts; environment; genomic instability; Hybridization, Genetic; Models, Genetic; Plant breeding; Quantitative Trait, Heritable; Stress, Physiological; Zea mays

In several crops, the water deficit is perhaps the main limiting factor in the search for high yields. The objective of this study was to evaluate the phenotypic stability of maize hybrids in environments with and without water restriction using the analytical factor (AF) approach. We evaluated 171 maize hybrids in 14 environments, divided into environments with (A1, A2, A3, A4, A5, A6, and A7 ... more

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In recent years, there has been a large incidence of fungi causing "ear rot" in maize in Brazil, the main fungus being Fusarium verticillioides. The most efficient and competitive alternative for control of this disease consists of using maize hybrids resistant to this pathogen. Thus, the aims of this study were to analyze the genetic variability of maize inbred lines in regard to resistance ... more

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Genetic improvement is essential to achieve increments in maize (Zea mays L.) grain yield components. It may be obtained through crosses, which enable to exploit the effects of intervarietal heterosis, allelic complementarity, as well as gene actions and effects. This study estimated the components of variance and genetic parameters (REML/BLUP) of an intervarietal diallel to select and predict ... more

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Edible Grain; environment; Genetic variation; Phosphorus; Plant breeding; Selective breeding; Soil; Stress, Physiological; Zea mays

The expansion of agriculture, coupled with the need for sustainable cropping, is one of the greatest challenges of the scientific community working on the generation of new cultivars adapted to abiotic stress conditions. The aim of this study was to evaluate the variability of popcorn lines as to responsiveness and efficiency in phosphorus use, as a first step towards the implementation of a ... more

I.F.S. Gerhardt; A.T.Amaral Júnior; L.J.M. Guimarães; I.A. Schwantes; A. Santos; S.H. Kamphorst; V.J. Lima; F.M. Poblete; G.O. Myers
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Edible Grain; Models, Genetic; Plant breeding; Quantitative Trait, Heritable; Selection, Genetic; Selective breeding; Zea mays

Selection indices commonly utilize economic weights, which become arbitrary genetic gains. In popcorn, this is even more evident due to the negative correlation between the main characteristics of economic importance - grain yield and popping expansion. As an option in the use of classical biometrics as a selection index, the optimal procedure restricted maximum likelihood/best linear unbiased ... more

C. Vittorazzi; A.T.Amaral Júnior; A.G. Guimarães; A.P. Viana; F.H.L. Silva; G.F. Pena; R.F. Daher; I.F.S. Gerhardt; G.H.F. Oliveira; M.G. Pereira
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The present study was conducted to investigate the genetic control and to estimate the general and specific combining abilities of popcorn for agronomic attributes and attributes related to resistance to northern leaf blight (NLB). The 56 hybrids (F and reciprocals), together with the eight parent lines and six controls, were evaluated in two harvests, in a randomized-block design with four ... more

J.S. Santos; A.T.Amaral Júnior; M. Vivas; G.S. Mafra; G.F. Pena; F.H.L. Silva; A.G. Guimarães
09/27/2018
Genetic divergence; Microsatellite marker; Specialty maize; Zea mays

In view of the narrow genetic base of popcorn, probably due to its evolution by selection from flint maize types alone, knowledge about genetic divergence is imperative for the formation of heterotic groups. Thus, our objective was to identify heterotic groups of popcorn lines; we did so by exploiting the representative genotype collection of the Active Popcorn ... more

C. Vittorazzi; A.T.Amaral Júnior; A.G. Guimarães; F.H.L. Silva; G.F. Pena; R.F. Daher; I.F.S. Gerhardt; G.H.F. Oliveira; P.H.A.D. Santos; Y.P. Souza; S.H. Kamphorst; V.J. Lima
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Amino acids; Biofortification; Breeding; nutritional profile of grains; Zea mays

The growing demand for maize creates a challenge for breeders; they need to constantly develop higher yielding and higher quality genotypes. We estimated the most relevant genetic parameters, along with heterosis and variance components. A multivariate approach was used in order to define profiles of narrow sense heritability for yield and nutritional components in ... more

I.R. Carvalho; A.J. de Pelegrin; M. Ferrari; V.J. Szareski; T.C. da Rosa; V.F. de Oliveira; J.F. Hoffmann; M. Nardino; G.G. Conte; F.C. Chaves; V.Q. de Souza; A.C. de Oliveira; L.C. da Maia
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In order to facilitate corn production, herbicides such as nicosulfuron and topramezone are commonly used. Though they offer great advantages, they can affect crop productivity and induce DNA damage. The genotoxic activity of nicosulfuron was evaluated at two concentrations (40,000 and 80,000 ppm) and topramezone at four concentrations (1480, 148, 14.8 and 1.48 ppm ... more

M.S. Reynoso; C.M. Alvarez; L.L. De la Cruz; A.R.A. Villalobos; J.F.G. Landeros; J.J.G. Sánchez

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