Estimation of repeatability and phenotypic correlations in Eragrostis curvula

Renzo, M. A. Di; Ibañez, M. A.; Bonamico, N. C.; Poverene, María Mónica

doi:10.1017/s0021859699007522

Cited by 11 publications

(9 citation statements)

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“…This long period of testing introduces the estimation of new genetic parameters that can be useful in breeding, such as repeatability (Falconer and Mackay, ). Repeatability estimates in the traits associated with productivity in forages are generally classified as having a moderate‐to‐high magnitude, as obtained in Elymus repens (Casler et al ., ), Eragrostis curvula (Renzo et al ., ), Medicago sativa (Ferreira et al ., ), Trifolium repens (Jahufer and Gawer, ), Secale cereale L. (Webb et al ., ), Panicum maximum (Resende et al ., ) and Pennisetum spp. (Cavalcante et al ., ).…”

Section: Discussionmentioning

confidence: 99%

Forage peanut (Arachis spp.) genetic evaluation and selection

Simeão

Assis

Montagner

et al. 2016

Grass and Forage Science

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Forage peanut improvement for use in grass–legume mixtures is expected to have a great impact on the sustainability of Brazilian livestock production. Eighteen cloned Arachis spp. ecotypes were evaluated under clipping in a Brazilian Cerrado region and results analysed using a mixed model methodology. The objective was to estimate genetic and phenotypic parameters and to select the best ecotypes based on selection index applied on their predicted genotypic value. The traits of total dry‐matter (DM) and leaf DM yield presented moderate (0·30 < hg2 < 0·50) to high (>0·50) broad‐sense heritability, in contrast to the low genetic variability in nutritional quality‐associated traits. Ecotypes of Arachis spp. contained average crude protein concentrations of 224 g kg−1 DM in leaves and 138 g kg−1 DM in stems, supporting the potential role of these species to overcome the low protein content in Cerrado pastures. The correlations between yield traits and traits associated with low nutritional value in leaves were consistently significant and positive. Genetic correlations among all the yield traits evaluated during the rainy or dry seasons were significant and positive. The ecotypes were ranked based on selection index. The next step is to validate long‐term selection of grass–Arachis in combination with pastures under competition and adjusted grazing in the Cerrado region.

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Section: Discussionmentioning

confidence: 99%

Forage peanut (Arachis spp.) genetic evaluation and selection

Simeão

Assis

Montagner

et al. 2016

Grass and Forage Science

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“…In perennial plants propagated by apomixis, estimates of the repeatability coefficient indicate the level of influence that permanent effects have on the observed phenotypic variation, and allows the performance of individuals to be predicted (Falconer and Mackay, 1996;Di Renzo et al, 2000). In addition, repeatability expresses the maximum value that heritability in the broad sense can reach, as it expresses the proportion of phenotypic variance that is attributed to the genetic differences mistaken for permanent effects acting on a cultivar or on progeny.…”

Section: Introductionmentioning

confidence: 99%

Repeatability of agronomic traits in Panicum maximum (Jacq.) hybrids

Braz¹,

Fonseca²,

Jank³

et al. 2015

Genet. Mol. Res.

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ABSTRACT. When evaluating plants, in particular perennial species, it is common to obtain repeated measures of a given trait from the same individual to evaluate the traits' repeatability in successive harvests. The degree of correlation among these measures defines the coefficient of repeatability, which has been widely utilized in the study of forage traits of interest for breeding. The objective of the present study was to evaluate the repeatability of agronomic traits in Panicum maximum hybrids. Hybrids from three progenies totaling 320 hybrids were evaluated in an incompleteblock design, with consideration of production and morpho-agronomic traits. Of the production traits, total dry matter and leaf dry matter showed the highest repeatability and varied from 0.540 to 0.769, whereas stem dry matter had lower coefficients (0.265-0.632). Among the morpho-agronomic traits, plant height and incidence of Bipolaris maydis had higher coefficients (0.118-0.460). The repeatability values of the agronomic traits were low-to- 19283 Repeatability in Panicum maximum©FUNPEC-RP www.funpecrp.com.br Genetics and Molecular Research 14 (4): 19282-19294 (2015) moderate, and six evaluations were sufficient to provide accuracy in the selection of hybrids regarding total dry matter, leaf dry matter, plant height, and incidence of B. maydis, whereas the other traits require more repeated measures to increase reliability in the prediction of their response.

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“…In perennial species propagated by apomixes (clonal reproduction), as in the case of Panicum maximum, the estimate of the repeatability coefficient indicates the degree of influence of the permanent effects on the phenotypic variation observed and allows the prediction of the performance of individuals (Di Renzo et al, 2000). Furthermore, the repeatability expresses the maximum value that the broad-sense heritability can achieve, since it expresses the proportion of phenotypic variance that is attributable to genetic differences confounded with the permanent effects that act on the cultivar.…”

Section: Introductionmentioning

confidence: 99%

Repeatability and phenotypic stabilization of Panicum maximum accessions

Martuscello

Braz

Jank³

et al. 2015

Acta Sci. Anim. Sci.

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The experiment aimed at determining repeatability coefficients for four methods (analysis of variance, principal components-correlation and covariance matrices and structural analysis), number of harvests necessary to increase accuracy and phenotypic stability of yield characteristics of accessions of Panicum maximum. The experiment was conducted in a completely randomized design with 35 genotypes and three replications. Five cuts were made and material was weighed and dried to obtain total, stem, leaf and dead forage dry matter yields. The repeatability coefficients in the different methods, for the evaluated characteristics, ranged from 0.1867 and 0.6583. The estimates of repeatability coefficients obtained for the evaluated characteristics by analysis of variance were generally smaller than the ones obtained with the other methods. By the principal components (based on the covariance matrix), the estimates were usually larger than those for the other methods. Therefore, it is possible to recommend this method to estimate the coefficient of repeatability for traits evaluated in this study. Considering that levels of 80 or 90% of confidence in the evaluation of the relative superiority of the accessions for all the evaluated characteristics are satisfactory, five harvests are sufficient for the choice of the best accession.

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Estimation of repeatability and phenotypic correlations in Eragrostis curvula

Cited by 11 publications

References 0 publications

Forage peanut (Arachis spp.) genetic evaluation and selection

Forage peanut (Arachis spp.) genetic evaluation and selection

Repeatability of agronomic traits in Panicum maximum (Jacq.) hybrids

<b>Repeatability and phenotypic stabilization of <i>Panicum maximum</i> accessions

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