G.F. Pena
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
Inference of genetic diversity in popcorn S3 progenies
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
Improvement of a popcorn population using selection indexes from a fourth cycle of recurrent selection program carried out in two different environments
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
Combining ability of S3 progenies for key agronomic traits in popcorn: comparison of testers in top-crosses
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
Optimizing the efficiency of the touchdown technique for detecting inter-simple sequence repeat markers in corn (Zea mays)
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
Genetic characterization of an elite coffee germplasm assessed by gSSR and EST-SSR markers
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
Multivariate approach in popcorn genotypes using the Ward-MLM strategy: morpho-agronomic analysis and incidence of Fusarium spp
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
Genetic progress in the UNB-2U population of popcorn under recurrent selection in Rio de Janeiro, Brazil
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
Stability and adaptability of popcorn genotypes in the State of Rio de Janeiro, Brazil
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
Indices estimated using REML/BLUP and introduction of a super-trait for the selection of progenies in popcorn
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 lik.. Read More»
Genet. Mol. Res. 16(3): gmr16039769
DOI: 10.4238/gmr16039769
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