Flowering traits in tetraploid Brachiaria ruziziensis breeding

Simeão, Rosângela Maria; Silva, Adriane Schio; Valle, Cacilda Borges do

doi:10.1590/1984-70332016v16n2a15

Cited by 5 publications

(8 citation statements)

References 16 publications

(11 reference statements)

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“…The correlation between agronomical and nutritional traits follows what has been observed previously for the genus Urochloa, as described for U. humidicola (Rendle) Morrone & Zuloaga (de Figueiredo et al, 2012), U. decumbens (Matias et al, 2016), U. ruziziensis (Simeão et al, 2016) and U. brizantha (Mauri et al, 2015). For forage growth, a considerable content of lignin and fiber is needed for the structural development and thickening of the cell wall, but this is an undesirable trait, as it decreases digestibility.…”

Section: Variability Of Forage Traits During the Dry And Wet Seasonssupporting

confidence: 84%

Association Mapping Considering Allele Dosage: An Example of Forage Traits in an Interspecific Segmental Allotetraploid Urochloa spp. Panel

et al. 2019

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The breeding process in tropical segmental allopolyploid forage Urochloa is challenging due to the complex genetic control of the traits. Knowledge about genes associated with forage traits, expressed in the different cutting seasons, are extremely useful to support breeding programs and development of new cultivars. Thus, the aims of our study were (i) to identify genomic regions related to forage traits through genome‐wide association studies (GWAS), and (ii) to verify the influence of allele dosage on these results. A panel of 272 genotypes of Urochloa spp. [U. brizantha (Hoscht. ex A. Rich.) R. Webster × U. ruziziensis (Hoscht. ex A. Rich.) R. Webster] was evaluated in both the wet and dry seasons. The GWAS analyses were performed with 26,535 single nucleotide polymorphisms (SNPs) obtained by genotyping‐by‐sequencing (GBS) using diploid and tetraploid allele dosage configurations. Furthermore, we evaluated scenarios including additive, dominance, and epistatic effects. Seven candidate genomic regions associated with the main forage traits of Urochloa spp. were identified. The importance of the diploid and tetraploid molecular configuration in GWAS analyses for segmental allopolyploid species was demonstrated to identify the genomic behavior of important regions. Results demonstrated that it is possible to identify the same regions using both ploidy configurations; however, in some cases, the allele substitution effect can be biased mainly for regions with dominance and epistatic effects. Finally, this study contributes to the understanding of genetic control of tropical forage traits and genomics to accelerate the selection and reduce the cost to release new cultivars.

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Section: Variability Of Forage Traits During the Dry And Wet Seasonssupporting

confidence: 84%

Association Mapping Considering Allele Dosage: An Example of Forage Traits in an Interspecific Segmental Allotetraploid Urochloa spp. Panel

et al. 2019

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“…This interspecific tetraploid population presented higher additive variability than that observed in a population of diploid U. ruziziensis (Simeão et al, 2016c), or Panicum virgatum L. (Bhandari et al, 2010) or Panicum maximum (Resende et al, 2004). Most of the traits evaluated presented more addictive effect, so the selection and use of parents with higher GCA are reasonable (Mendes et al, 2015).…”

Section: Diallel Analysis and Selection Methodsmentioning

confidence: 65%

Contribution of Additive and Dominance Effects on Agronomical and Nutritional Traits, and Multivariate Selection on Urochloa spp. Hybrids

et al. 2018

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A tropical forage breeding program contains several peculiarities, especially when it involves polyploid species and facultative apomixis. Urochloa spp. are excellent perennial forages, and the identification of superior genotypes depends on the selection of many characteristics under complex genetic control, with high cost and time‐consuming evaluation. Therefore, the use of tools such as multivariate analysis and diallel analyses could contribute to improving the efficiency of breeding programs. Thus, the objectives were to estimate (i) the contribution of additive and nonadditive effects on agronomical and nutritional traits in a population of interspecific hybrids of Urochloa spp., originated from a partial diallel between five apomictic and four sexual parents, and (ii) the accuracy of multivariate index selection efficiency. Genetic variability was detected between the parents, crosses, and hybrids for all the traits. There was no clear trend of the importance of the additive and nonadditive genetic effects on agronomical and nutritional traits. Furthermore, the predominant component of genetic variance changed depending on the characteristic. Moreover, there was no parent or cross that was outstanding for all traits simultaneously, showing the high variability generated from these crosses. The Mulamba and Mock index associated with principal components analysis allowed a more significant gain only for agronomic characteristics. However, the per se index, at the univariate level, promoted a more balanced response to selection for all traits.

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“…Simeão et al. (,b) described in detail the methods used to generate and evaluate the 59 progeny studied here. Briefly, the experiment included 20 replications and one plant per plot (1.5 m × 1.5 m spacing), and the plants were sown in November 2012 in a randomized block design.…”

Section: Methodsmentioning

confidence: 99%

“…A 2‐week overlap occurred between the last evaluations of flowering (Simeão et al. ) and the start of seed harvest.…”

Section: Methodsmentioning

confidence: 99%

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Unravelling the inheritance, Q_ST and reproductive phenology attributes of the tetraploid tropical grass Brachiaria ruziziensis (Germain et Evrard)

2016

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The autotetraploid forage Congo signal grass (Brachiaria ruziziensis) is an important component in the Brachiaria breeding programme. As with other tropical forage grass species, the association between flowering and seed yield components, the mode of inheritance and the effects of population structure on phenotypic breeding are lacking. Seventeen characteristics evaluated in 59 half‐sib progeny of seven subpopulations were analysed using a mixed model methodology. According to the commonality analysis, the total seed yield (0.67) and number of days to flowering (0.22) had a greater influence on the filled‐seed yield. The flowering synchrony, total number of panicles, filled‐seed yield, green matter yield and dry matter yield presented statistically significant additive genetic variance between and within the subpopulations. The QST estimates ranged from 0.09 for the flowering synchrony index to 0.31 for the filled‐seed yield. The effects of population structure and its use in breeding programmes are further discussed.

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Flowering traits in tetraploid Brachiaria ruziziensis breeding

Cited by 5 publications

References 16 publications

Association Mapping Considering Allele Dosage: An Example of Forage Traits in an Interspecific Segmental Allotetraploid Urochloa spp. Panel

Association Mapping Considering Allele Dosage: An Example of Forage Traits in an Interspecific Segmental Allotetraploid Urochloa spp. Panel

Contribution of Additive and Dominance Effects on Agronomical and Nutritional Traits, and Multivariate Selection on Urochloa spp. Hybrids

Unravelling the inheritance, Q_ST and reproductive phenology attributes of the tetraploid tropical grass Brachiaria ruziziensis (Germain et Evrard)

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Flowering traits in tetraploid Brachiaria ruziziensis breeding

Cited by 5 publications

References 16 publications

Association Mapping Considering Allele Dosage: An Example of Forage Traits in an Interspecific Segmental Allotetraploid Urochloa spp. Panel

Association Mapping Considering Allele Dosage: An Example of Forage Traits in an Interspecific Segmental Allotetraploid Urochloa spp. Panel

Contribution of Additive and Dominance Effects on Agronomical and Nutritional Traits, and Multivariate Selection on Urochloa spp. Hybrids

Unravelling the inheritance, QST and reproductive phenology attributes of the tetraploid tropical grass Brachiaria ruziziensis (Germain et Evrard)

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Unravelling the inheritance, Q_ST and reproductive phenology attributes of the tetraploid tropical grass Brachiaria ruziziensis (Germain et Evrard)