Research Article

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Cercospora zeae-maydis; Combining ability; Exserohilum turcicum; Gray leaf spot; Northern leaf blight; Zea mays L.

We estimated general and specific combining abilities and examined resistance to northern leaf blight (Exserohilum turcicum) and to gray leaf spot (Cercospora zeae-maydis) in a set of nine inbred popcorn lines. These inbreds were crossed in a complete diallel scheme without reciprocals, which produced 36 F1 hybrids. Two experiments with a square lattice design ... more

R.A. Vieira; C.A. Scapim; L.M. Moterle; D.J. Tessmann; T.V. Conrado; A.T.Amaral Júnior
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Combining ability; Heterotic group; Heterotic grouping methods; Simple sequence repeat markers; Tropical heterotic maize; Zea mays L.

The objectives of the present study were to determine heterotic groups of germplasm lines of tropical maize by test crosses and by simple sequence repeat (SSR) markers and to compare five grouping methods of heterogeneous maize. Sixteen lines of nine populations in the S5 generation were evaluated in test crosses with three testers. The results of four experimental trials over two ... more

C.G. Aguiar; I. Schuster; A.T.Amaral Júnior; C.A. Scapim; E.S.N. Vieira
10/07/2008
Combining ability; diallel analysis; Heterosis; Zea mays L.

With the aim of estimating genetic parameters and identifying superior popcorn combinations, 10 parents were crossed in a circulant diallel and evaluated together with the 15 resulting hybrids at two locations in two growing seasons for grain yield, number of broken plants, number of partially husked ears and popping expansion. The hybrids were less sensitive to environmental variations than ... more

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ISSR; Plant breeding; Zea mays L.

We examined the effect of incorporation of molecular markers on variability between and within populations in order to maximize heterotic effects and longevity of a maize reciprocal recurrent selection program. Molecular variability was quantified by inter-simple sequence repeat (ISSR) markers between and within the maize populations Cimmyt and Piranão in the 10th cycle of a reciprocal ... more

A.P.C.G. Berilli; M.G. Pereira; L.S.A. Gonçalves; K.S. da Cunha; H.C.C. Ramos; G.A.Souza Filho; A.Tdo Amaral Júnior
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Genotypic correlations; Heritability; Principle component analysis; Zea mays L.

We estimated the association of genetic parameters with production characters in 64 maize (Zea mays) genotypes in a green house in soil with 40-100% moisture levels (percent of soil moisture capacity). To identify the major parameters that account for variation among the genotypes, we used single linkage cluster analysis and principle component analysis. Ten plant characters were ... more

R.W. Muhammad; A. Qayyum
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Direct selection; Full-sib families; Genetic gains; Zea mays L.

We estimated the genetic gains of the 12th cycle of reciprocal recurrent selection for maize traits of agronomic interest. We used 23 ISSR molecular markers in an attempt to maximize genetic variability among and within populations based on selection of S1 progenies. To this end, 138 full-sib families were evaluated in a randomized block design in two environments (the ... more

K.S. da Cunha; M.G. Pereira; L.S.A. Gonçalves; A.P.C.G. Berilli; E.C. de Oliveira; H.C.C. Ramos; A.Tdo Amaral Júnior
12/12/2014
Genetic divergence; Simple sequence repeat markers; Sweet corn; Zea mays L.

The purpose of this study was to analyze the genetic diversity of 15 sugary-1 sweet corn lines by microsatellite markers. One hundred pairs of simple sequence repeat primers that were mapped for field corn were tested. Of these primers, 15% were polymorphic, and all were selected for the evaluation. These primers identified a total of 39 alleles among the 15 loci that were ... more

A.D. Lopes; C.A. Scapim; C.A. Mangolin; M.F.P.S. Machado
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Genetic components; Heritability; Zea mays L.

Among the many implications of climatic change on agriculture, drought is expected to continue to have a major impact on agribusinesses. Leaf curling is an anatomical characteristic that might be potentially used to enhance plant tolerance to water deficit. Hence, we aimed to study the genetic control of leaf curl in maize. From 2 contrasting inbred lines for the trait, generations F ... more

G.C. Entringer; F.L. Guedes; A.A. Oliveira; J.P. Nascimento; J.C. Souza
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Energy dispersive X-ray spectroscopy; Scanning electron microscopy; Silica bodies; Zea mays L.

Different plant species have different levels and locations of silicon accumulation in their tissues, and may or may not have silica bodies. Grasses usually accumulate these bodies, which may have different shapes depending on the genotype. Besides, this element can be beneficial to crops. The present study aimed to examine the forms and locations of silicon accumulation, as well as ... more

F.A. Andrade; A. Júnior; C.G.T.J. Andrade; E. Miglioranza
06/12/2015
Genetic diversity; Heterotic group; Simple sequence repeat markers; Zea mays L.

The objective of the current study was to apply molecular markers (microsatellites) in the analysis of genetic diversity of 48 lines of the elite maize germplasm stored in the bank of the Cooperativa Central de Pesquisa Agrícola - Coodetec, PR, Brazil, and estimate the correlation between genetic distance and heterosis and hybrid performance from the crosses among these maize lines. Forty ... more

E.H. Fernandes; I. Schuster; C.A. Scapim; E.S.N. Vieira; M.M.D. Coan

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