Agronomic evaluation of 324 intraspecific hybrids of Brachiaria decumbens in Brazil

Mateus, Rogério Gonçalves; Barrios, S. C. L.; Figueiredo, Ulisses José de; Valle, Cacilda Borges do

doi:10.17138/tgft(1)99-100

Cited by 6 publications

(5 citation statements)

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“…Significant estimates of σ 2 gc (p < 0.01) were also reported by Mendonça et al (2013) on the evaluation of 50 B. decumbens hybrids using six clippings (four in the rainy and two in the dry season) also for agronomic and nutritive value traits, except for NDF and LIG. Mateus et al (2013) also found genotype x clippings interaction (p < 0.01) when evaluating 324 B. decumbens hybrids for agronomic performance using two dry season clippings, with exception of REG and leaf/stem ratio.…”

Section: Resultsmentioning

confidence: 80%

Estimate of genetic parameters in Brachiaria decumbens hybrids

Matias

Barrios

Valle

et al. 2016

Crop Breed. Appl. Biotechnol.

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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, indicating the possibility of gains with selection. Significant genetic correlations were observed between FGW and TDM (0.99), TDM and SR (0.81), TDM and LIG (0.71), and CP and IVD (0.70

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Section: Resultsmentioning

confidence: 80%

Estimate of genetic parameters in Brachiaria decumbens hybrids

Matias

Barrios

Valle

et al. 2016

Crop Breed. Appl. Biotechnol.

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“…‘Basilisk’. This species exhibits exceptional adaptation to the poor and acidic soils that are typical of the tropics and lead to good animal performance [ 4 ]. However, the molecular genetic information regarding this species is limited, mainly due to its reproducing predominantly via apomixis and because its ploidy levels range from diploid to pentaploid [ 5 ].…”

Section: Introductionmentioning

confidence: 99%

Microsatellite loci for Urochloa decumbens (Stapf) R.D. Webster and cross-amplification in other Urochloa species

et al. 2016

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BackgroundForage grasses of the African genus Urochloa (syn. Brachiaria) are the basis of Brazilian beef production, and there is a strong demand for high quality, productive and adapted forage plants. Among the approximately 100 species of the genus Urochloa, Urochloa decumbens is one of the most important tropical forage grasses used for pastures due to several of its agronomic attributes. However, the level of understanding of these attributes and the tools with which to control them at the genetic level are limited, mainly due to the apomixis and ploidy level of this species. In this context, the present study aimed to identify and characterize molecular microsatellite markers of U. decumbens and to evaluate their cross-amplification in other Urochloa species.FindingsMicrosatellite loci were isolated from a previously constructed enriched library from one U. decumbens genotype. Specific primers were designed for one hundred thirteen loci, and ninety-three primer pairs successfully amplified microsatellite regions, yielding an average of 4.93 alleles per locus. The polymorphism information content (PIC) values of these loci ranged from 0.26 to 0.85 (average 0.68), and the associated discriminating power (DP) values ranged from 0.22 to 0.97 (average 0.77). Cross-amplification studies demonstrated the potential transferability of these microsatellites to four other Urochloa species. Structure analysis revealed the existence of three distinct groups, providing evidence in the allelic pool that U. decumbens is closely related to Urochloa ruziziensis and Urochloa brizantha. The genetic distance values determined using Jaccard’s coefficient ranged from 0.06 to 0.76.ConclusionsThe microsatellite markers identified in this study are the first set of molecular markers for U. decumbens species. Their availability will facilitate understanding the genetics of this and other Urochloa species and breeding them, and will be useful for germplasm characterization, linkage mapping and marker-assisted selection.Electronic supplementary materialThe online version of this article (doi:10.1186/s13104-016-1967-9) contains supplementary material, which is available to authorized users.

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“…At Embrapa Beef Cattle, additional trials that correlate data from the greenhouse methodology and agronomic performance in field conditions will be carried out in order to ensure the proposed methodology for discarding non-adapted hybrids at initial phases of the breeding program. The hybrids evaluated in this work have already been evaluated for agronomic and nutritional traits (Mateus et al 2013, Mendonça et al 2013, and are currently being evaluated for spittlebug resistance in greenhouse assays. Four of the seven hybrids which had Al resistance better than cv.…”

Section: Resultsmentioning

confidence: 99%