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| MATIAS, F. I.; VIDOTTI, M. S.; MEIRELES, K. G. X.; BARRIOS, S. C. L.; VALLE, C. B. do; CARLEY, C. A. S.; FRITSCHE-NETO, R.. |
| 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 genomewide 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... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Tropical regions; Urochloa; Forage; Animal proteins; Cattle feeding; Animal performance; Pastures. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1117774 |
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| MATIAS, F. I.; BARRIOS, S. C. L.; BEARARI, L. M.; MEIRELES, K. G. X.; MATEUS, R. G.; AMARAL, P. N. C. do; ALVES, G. F.; VALLE, C. B. do; FRITSCHE-NETO, R.. |
| 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... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Forrageira Tropical; Apomixia; Gramínea Perene; Controle Genético; Hibrido; Cruzamento Animal; Livestock; Grasslands; Breeding; Urochloa; Perennials; Polyploidy; Hybrids. |
| Ano: 2018 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1106550 |
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| MATIAS, F. I.; BARRIOS, S. C. L.; VALLE, C. B. do; MATEUS, R. G.; MARTINS. L. B.; MORO, G. V.. |
| The objective of this study was to estimate genetic parameters for agronomic traits and nutritional value in intraspecific hybrids of B. decumbens. For this, a population of 1,415 hybrids was evaluated in field plots at Embrapa Beef Cattle in Campo Grande/MS/Brazil, with seven clippings in order to estimate field green weight (FGW); total dry matter (TDM); speed of regrowth (SR); tiller regrowth density (TRD); regrowth ability (REG); crude protein (CP); in vitro organic matter digestibility (IVD); neutral detergent fiber (NDF) and lignin (LIG). The statistical analyses were carried out using the mixed models methods. Genetic variability for all traits assessed was detected, and estimates of individual heritability were of medium to high magnitude,... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Brachiaria decumbens; Proteina bruta; Seleção recorrente; Urochloa decumbens; Agronomic traits; Heritability; Recurrent selection; Crude protein. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1088153 |
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| MATIAS, F. I.; MEIRELES, K. G. X.; NAGAMATSU, S. T.; BARRIOS, S. C. L.; VALE, C. B. do; CARAZZOLLE, M. F.; FRITSCHE-NETO, R.; ENDELMAN, J. B.. |
| Although genotyping-by-sequencing (GBS) is a well-established marker technology in diploids, the development of best practices for tetraploid species is a topic of current research. We determined the theoretical relationship between read depth and the phred-scaled probability of genotype misclassification conditioned on the true genotype, which we call expected genotype quality (EGQ). If the GBS method has 0.5% allelic error, then 17 reads are needed to classify simplex tetraploids as heterozygous with 95% accuracy (EGQ = 13) vs. 61 reads to determine allele dosage. We developed an R script to convert tetraploid GBS data in variant call format (VCF) into diploidized genotype calls and applied it to 267 interspecific hybrids of the tetraploid forage grass... |
| Tipo: Artigo em periódico indexado (ALICE) |
Palavras-chave: Although genotyping-by-sequencing; Marker technology; Genotype; Hybrids; Urochloa. |
| Ano: 2019 |
URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1117777 |
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| MATIAS, F. I.; BARRIOS, S. C. L.; VALLE, C. B. do; MATEUS, R. G.; SANTOS, M. F.; JANK, L.. |
| As pastagens constituem no sistema pecuário Brasileiro de corte, a principal fonte de alimentação adotada para a produção animal. A utilização das mesmas cultivares comerciais no entanto, promoveu a formação de extensos monocultivos resultando em grandes riscos fitotécnicos e fitossanitários. Com base nessas informações, o presente trabalho teve por objetivo avaliar caracteres agronômicos e nutricionais de uma população de híbridos intraespecíficos de Brachiaria decumbens, a fim de predizer os ganhos de seleção para cada característica. Para isso, uma população de irmãos germanos de B. decumbens foi obtida por meio do cruzamento entre 75 híbridos sexuais com a cultivar apomítica Basilisk. |
| Tipo: Resumo em anais de congresso (ALICE) |
Palavras-chave: Melhoramento de forrageira; Basilisk; Ganho de seleção; Hibrido. |
| Ano: 2016 |
URL: http://www.alice.cnptia.embrapa.br/handle/doc/1066085 |
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