Estimates of genetic parameters and genotypic values prediction in maize landrace populations by REML/BLUP procedure

Baretta, Diego; Nardino, Maicon; Carvalho, Ivan Ricardo; Pelegrin, Alan Junior de; Ferrari, Maurício; Szareski, Vinícius Jardel; Barros, Willian Silva; Souza, V. Q. de; Oliveira, A.C. de; Maia, Luciano Carlos da

doi:10.4238/gmr16029715

Cited by 15 publications

(15 citation statements)

References 14 publications

(17 reference statements)

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“…Currently, breeding programs seek to identify high yielding genotypes, and posteriorly target their selection strategies in the quality of the grains, thus, the search for the ideal genotype that gathers productive and qualitative superiority demands elevated financial and labor resources of the breeding program, as well as suitable selecting strategies [3] [4] [5] [6]. An alternative to minimize this obstacle is the multivariate selection, which aims to select a set of simultaneous traits.…”

Section: Introductionmentioning

confidence: 99%

Adaptability, Stability and Multivariate Selection by Mixed Models

Pelegrin¹,

Carvalho²,

Nunes³

et al. 2017

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The aim of this work was to estimate the adaptability and stability of grain yield per hectare and percentage of crude protein of maize grains combined in an index, and to establish a multicharacter selection through mixed models based on an objective character and 15 auxiliary traits. The trials were conducted in the 2013/2014 agricultural year in four growing environments of the Rio Grande do Sul, BR state. The experimental design was randomized blocks arranged in a factorial scheme, being four growing sites × 15 single cross maize hybrids, arranged in three repetitions. The genotypic index, composed by the grain yield and the crude protein percentage in the grains, is the best selection strategy to achieve maize superior genotypes. The multivariate genotypes selection, considering grain yield and crude protein, is efficient. The genotypes FORMULA TL®, AS1656PRO®, P30F53Hx®, LG6304YG® and 30F53 are more adapted and stable for grain yield and percentage of crude protein, in the conditions of this study. The mixed models were efficient to employ the multicharacter selection and to contribute for maize genetic breeding.

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Section: Introductionmentioning

confidence: 99%

Adaptability, Stability and Multivariate Selection by Mixed Models

Pelegrin¹,

Carvalho²,

Nunes³

et al. 2017

AJPS

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“…The stem diameter is an important morphologic trait associated with grain yield, as it acts as sustentation and structure of energetic storage. Therefore, plants with larger stem diameter tend to present bigger energetic reserves, which are accumulated during the vegetative period and translocated to the spike during grains formation and filling (Fancelli and Dourado Neto, 2000;Baretta et al, 2017). Studies of Cruz et al (2008), also revealed strong and positive associations between stem diameter and grain yield.…”

Section: Resultsmentioning

confidence: 99%

Path analysis and canonical variables of intervarietal maize hybrids

et al. 2019

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Maize (Zea mays L.) is the cereal most produced in the world, due to its wide scope and utilization in human and animal diet. This study aims to evaluate the agronomic performance of intervarietal maize hybrids, as well as the linear associations, interrelations of cause and effect, and the genotypes dispersion through canonical variates. The experiment was conducted in the agricultural year of 2014/2015. The crosses that originated the hybrids were carried out on the growing season of 2013/2014 and hybrids evaluated on 2014/2015. The hybrids were arranged in randomized blocks, being 13 treatments with five repetitions. The measured characters were: plant height, spike insertion height, stem diameter, spike diameter, spike length, spike mass, number of rows of grains per spike, number of grains per row, cob diameter, cob mass, spike grains mass, mass of a thousand grains, grain length and grain yield. The data were submitted to analysis of variance and mean values compared by the Tukey test at 5% of probability. The Pearson’s linear correlation analysis and path analysis were performed using grain yield as a dependent character. Furthermore, the analysis of canonical variables was carried out. The hybrid H5: G3 X G4 revealed higher grain yield, spike grains mass, number of grains per row and spike diameter. Grain yield of intervarietal hybrids presented positive correlations with the traits such as stem diameter, spike diameter, spike length, number of grains per row, mass of a thousand grains, grain length and spike grains mass. Spike diameter and spike length presented higher direct effects on grain yield of intervarietal hybrids. The canonical variates revealed the formation of five phenotypically distinct groups of intervarietal hybrids.

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“…Only the open pollinated genotypes were found in Pelotas through the PL2 genotype, yielding 6705 kg.ha -1 .The great variation expressed for this character is due to the phenotypic plasticity that the genotypes present C. Troyjack et al 6 due to their broad or narrow genetic base (Emygdeo et al, 2013;Baretta et al, 2017;. The analysis of the linear correlations between the agronomic characteristics measured was established to establish trends among these characters, with significance based on a probability of 5% by the t test.…”

Section: Resultsmentioning

confidence: 99%

“…One of the important components in the definition of maize yield is the genetic base used, distinct technological levels, being a necessary tool for decision making in the management and breeding. The combination of these factors will allow the maximum obtainment of the resources of the environment, seeking to optimize the productivity of the species of agricultural importance in a sustainable way (Argenta et al, 2003;Nardino et al, 2016;Baretta et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Research Article Productive performance and multivariate interrelations of open-pollinated and hybrid maize in Brazil

Troyjack¹,

Pimentel²,

Carvalho³

et al. 2019

Genet. Mol. Res.

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Corn is considered one of the most important crops in the world agricultural scenario. In order to improve production, it is crucial to understand and quantify the genetic variation involved in the phenotypic manifestation of this species. We evaluated the agronomic performance of open pollinated genotypes, used by small scale family farmers, compared to commercial hybrid genotypes in various growing environments. The experimental design was a randomized block and the treatments were arranged in four replicates. Eight maize genotypes were used: three open-pollinated varieties and five simple hybrids. The following characters were measured plant height, ear insertion height, stem diameter, ear length, number of seed rows of the ear, number of seeds per row of ear, thousand seed weight and seed yield. The best yields of seeds were obtained in Entre-Ijuís, RS. Seed yield varied according to the genotype and growing environment; in Pelotas, RS the highest yields were obtained with the HC2 and HC1 genotypes (9090 and 9002 kg.ha -1 , respectively). Genotypes with a narrow genetic base express less variation in their responses to the environments, in contrasting ©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 18 (3): gmr18180 C. Troyjack et al. 2 environments. Under limiting conditions the open pollinated varieties responded favorably. The use of biometric approaches allows us to reveal patterns in the grouping of genotypes.

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Estimates of genetic parameters and genotypic values prediction in maize landrace populations by REML/BLUP procedure

Cited by 15 publications

References 14 publications

Adaptability, Stability and Multivariate Selection by Mixed Models

Adaptability, Stability and Multivariate Selection by Mixed Models

Path analysis and canonical variables of intervarietal maize hybrids

Research Article Productive performance and multivariate interrelations of open-pollinated and hybrid maize in Brazil

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