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G.F. Pena

Publications of : G.F. Pena
Plant Genetics   Research Article

Genetic control and combining ability of agronomic attributes and northern leaf blight-related attributes in popcorn

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 (F1 and reciprocals), together with the eight parent lines and six controls, were evaluated in two harvests, in a randomi.. Read More»

Genet. Mol. Res. 16(3): gmr16039772

DOI: 10.4238/gmr16039772

Plant Genetics   Research Article

Inference of genetic diversity in popcorn S3 progenies

    G.F. Pena, A.T. do Amaral Jr, R.M. Ribeiro, H.C.C. Ramos,M.S.B. Boechat, J.S. Santos, G.S. Mafra, S.H. Kamphorst, V.J. de Lima, M. Vivas and G.A. de Souza Filho

Molecular markers are a useful tool for identification of complementary heterotic groups in breeding programs aimed at the production of superior hybrids, particularly for crops such as popcorn in which heterotic groups are not well-defined. The objective of the present study was to analyze the genetic diversity of 47 genotypes of tropical popcorn to identify possib.. Read More»

Genet. Mol. Res. 15(2): gmr.15028456

DOI: 10.4238/gmr.15028456

Plant Genetics   Research Article

Improvement of a popcorn population using selection indexes from a fourth cycle of recurrent selection program carried out in two different environments

    A.T. Amaral Júnior, S.P. Freitas Júnior, R.M. Rangel, G.F. Pena, R.M. Ribeiro, R.C. Morais and A.R. Schuelter

We estimated genetic gains for popcorn varieties using selection indexes in a fourth cycle of intrapopulation recurrent selection developed in the campus of the Universidade Estadual do Norte Fluminense. Two hundred full-sib families were obtained from the popcorn population UNB-2U of the third recurrent selection cycle. The progenies were evaluated in a randomized .. Read More»

Genet. Mol. Res. 9(1): vol9-1gmr702

DOI: 10.4238/vol9-1gmr702

Plant Genetics   Research Article

Combining ability of S3 progenies for key agronomic traits in popcorn: comparison of testers in top-crosses

    V.J. de Lima, A.T. do Amaral Junior, S.H. Kamphorst, G.F. Pena,J.T. Leite, K.F.M. Schmitt, C. Vittorazzi, J.E. de Almeida Filho and F. Mora

The successful development of hybrid cultivars depends on the reliability of estimated combining ability of the parent lines. The objectives of this study were to assess the combining ability of partially inbred S3 families of popcorn derived from the open-pollinated variety UENF 14, via top-crosses with four testers, and to compare the testers for their ability to .. Read More»

Genet. Mol. Res. 15(4): gmr15049319

DOI: 10.4238/gmr15049319

Plant Genetics   Research Article

Optimizing the efficiency of the touchdown technique for detecting inter-simple sequence repeat markers in corn (Zea mays)

    E.C. Oliveira, A.T. Amaral Júnior, L.S.A. Gonçalves, G.F. Pena, S.P. Freitas Júnior, R.M. Ribeiro and M.G. Pereira

We evaluated the efficiency of the touchdown method to determine the ideal PCR conditions for distinct inter-simple sequence repeat primers for processing DNA from common corn, popcorn, sweet corn, and a Tripsacum-maize hybrid. Genomic DNA was extracted from eight accessions of corn: two of the dent type, one Tripsacum-maize hybrid, one sweet corn, one flint-type co.. Read More»

Genet. Mol. Res. 9(2): vol9-2gmr767

DOI: 10.4238/vol9-2gmr767

Plant Genetics   Research Article

Genetic characterization of an elite coffee germplasm assessed by gSSR and EST-SSR markers

    R.F. Missio, E.T. Caixeta, E.M. Zambolim, G.F. Pena, L. Zambolim, L.A.S. Dias and N.S. Sakiyama

Coffee is one of the main agrifood commodities traded worldwide. In 2009, coffee accounted for 6.1% of the value of Brazilian agricultural production, generating a revenue of US$6 billion. Despite the importance of coffee production in Brazil, it is supported by a narrow genetic base, with few accessions. Molecular differentiation and diversity of a coffee breeding program were assessed with gSSR .. Read More»

Genet. Mol. Res. 10(4): 2011.October.6.2

DOI: 10.4238/2011.October.6.2

Microbial Genetics   Research Article

Multivariate approach in popcorn genotypes using the Ward-MLM strategy: morpho-agronomic analysis and incidence of Fusarium spp

    R.N.F. Kurosawa, A.T. do Amaral Junior, F.H.L. Silva, A. dos Santos,M. Vivas, S.H. Kamphorst and G.F. Pena

The multivariate analyses are useful tools to estimate the genetic variability between accessions. In the breeding programs, the Ward-Modified Location Model (MLM) multivariate method has been a powerful strategy to quantify variability using quantitative and qualitative variables simultaneously. The present study was proposed in view of the dearth of information ab.. Read More»

Genet. Mol. Res. 16(1): gmr16019528

DOI: 10.4238/gmr16019528

Plant Genetics   Research Article

Genetic progress in the UNB-2U population of popcorn under recurrent selection in Rio de Janeiro, Brazil

    R.M. Ribeiro, A.T. do Amaral Júnior, L.S.A. Gonçalves, L.S. Candido, T.R.C. Silva and G.F. Pena

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 t.. Read More»

Genet. Mol. Res. 11(2): 2012.May.15.12

DOI: 10.4238/2012.May.15.12

Cytogenomics   Research Article

Stability and adaptability of popcorn genotypes in the State of Rio de Janeiro, Brazil

    G.F. Pena A.T. do Amaral Júnior L.S.A. Gonçalves L.S. Candido C. Vittorazzi R.M. Ribeiro S.P. Freitas Júnior

This study aimed to obtain estimates of stability and adaptability of phase launched materials and materials recommended in the country, for the northern and northwestern regions of Rio de Janeiro State, Brazil, and made a comparative analysis of different methods to evaluate stability and adaptability of grain yield and popping expansion. To this end, 10 genotypes were evaluated (UNB2U-C3, UNB2U-.. Read More»

Genet. Mol. Res. 11(3): 2012.August.31.1

DOI: 10.4238/2012.August.31.1

Plant Genetics   Research Article

Water stress adaptation of popcorn roots and association with agronomic traits

Water stress reduces the yield of agricultural crops severely. The objectives of this study were to investigate genotypic differences between 20 popcorn lines in environments under wellirrigated (WW) and water stressed (WS) conditions to determine phenotypic, genetic and environmental relations among agronomic and root traits. The experiment was arranged in a random.. Read More»

Genet. Mol. Res. 17(3): http://dx.doi.org/gmr18078

DOI: http://dx.doi.org/10.4238/gmr18078