Estimativa de coeficientes de repetibilidade para mancha ocular em clones de Pennisetum

Oliveira, Tatiana Neres de; Santos, M. V. F. dos; Lira, M. A.; Mello, Alexandre Carneiro Leão de; Ferreira, Rinaldo L. C.; Júnior, Mario A. Lira; Silva, N. G. M.

doi:10.4321/s0004-05922011000300067

Cited by 3 publications

(2 citation statements)

References 10 publications

(13 reference statements)

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“…High heritability values, as found in this study, allow significant gains in all traits. Knowledge of the maximum heritability in the case of perennial and semi-evergreen crops, as is the case of sacha inchi, is fundamental, because the selection of promising genotypes depends on long experiments of retreated trait measurements on a same plant (Oliveira et al 2011).…”

Section: Discussionmentioning

confidence: 99%

Repeatability of biometric and fruit and seed yield traits of sacha inchi

et al. 2017

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Repeatability allows an estimation of the number of evaluations needed to optimize the selection of superior genotypes, with consequent effects on the research costs in terms of financial and human resources. The objective of this study was to estimate the coefficient of repeatability of biometric and yield traits, related to fruits and seeds of sacha inchi (Plukenetia volubilis), and to define the number of evaluations required for an efficient selection and evaluation of genotypes of the species. A total of 37 non-domesticated accessions were evaluated for 19 months in a randomized block design with 5 replications and 2 plants per plot. The total number of fruits, total number of seeds, total fruit weight, mean fruit weight, and number of seeds per fruit of the accessions were evaluated by monthly sampling. Additionally, seed biometry was assessed in a sample of 30 seeds per accession. Repeatability coefficients were estimated by analysis of variance, principal components and structural analysis. The principal component method based on the covariance matrix was the most appropriate for establishing repeatability estimates of sacha inchi, due to the cyclical nature of the crop. Superior genotypes of the species can be selected for yield-related traits with about 90% accuracy, from 5 harvests (months) onwards. To ensure this accuracy level, it would be necessary to evaluate a minimum of 5 and 25 fruits to determine mean fruit weight and number of seeds per fruit, respectively, and 39 seeds would be required to evaluate the biometric traits.

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Section: Discussionmentioning

confidence: 99%

Repeatability of biometric and fruit and seed yield traits of sacha inchi

et al. 2017

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“…Because of this, it is necessary to determine the number of measurements to be made through the repeatability quotient because this is an approximation of the maximum value that the inheritance of a characteristic can reach, in broadest sense (Cruz et al, 2012). This information is valuable for breeding programs, since it allows estimating the least selection cycle possible and also allows allocating human and financial resources to the research (Torres et al, 2015) With regard to elephant-grass, it has been found that most of the scientific studies (Daher et al, 2004;Oliveira et al, 2011;Cavalcante et al, 2012) show results oriented to the use of this grass for animal production; no literature, to our knowledge, has used the abovementioned statistical tool for this grass with the purpose of studying it with bio-energetic purposes.…”

Section: Introductionmentioning

confidence: 99%

Repeatability and minimum number of evaluations for morpho-agronomic characters of elephant-grass for energy purposes

Souza

Daher

Pereira

et al. 2017

Agraria

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Due to the need to promote information relevant to elephant-grass breeding programs for energy purposes, this work aimed to estimate the coefficient of repeatability of the main morpho-agronomic characters and to predict the minimum number of cuts required for selection with greater efficiency. A total of 73 elephant-grass genotypes were evaluated in a randomized block design, in a subdivided plot scheme with two replicates. Nine cuts were performed at six-month intervals, from June 2012 to December 2016, in the municipality of Campos dos Goytacazes, RJ. We estimated the repeatability coefficients for dry matter yield (DMY), number of tillers (NT), plant height (PH), stem diameter (SD) and leaf blade width (LBW), using the methods of analysis of variance, principal components and structural analysis. At least nine, three, six, six and three cuts should be performed, considering the DMY, NT, PH, SD and LBW characteristics, respectively, to predict the true value of the genotypes with 80% reliability.

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