Estacionalidade e estabilidade de produção de forragem de progênies de Brachiaraia ruziziensis

Sobrinho, Fausto Souza; Lédo, Francisco José da Silva; Köpp, Maurício Marini

doi:10.1590/s1413-70542011000400006

Cited by 13 publications

(8 citation statements)

References 7 publications

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“…Marandu differs from the genotypes evaluated, showing the largest weight, followed by hybrids C001 and R041 (Table 2). Regarding the number of vegetative tillers, genotypes X030, Y021, T026, R126, R110 and R087 showed the highest production in terms of biomass, which is an important character in the development of new cultivars (Souza-Sobrinho et al, 2005;Souza-Sobrinho et al, 2011). However, these genotypes did not show high seed yield (Tables 1, 3 and 4).…”

Section: Resultsmentioning

confidence: 94%

Brachiaria decumbens intraspecific hybrids: characterization and selection for seed production

et al. 2016

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Brachiaria decumbens has great importance in the national beef cattle scenario due to its high forage yield potential and high adaptability to acid soils and low fertility. In order to obtain new cultivars, intraspecific hybrids, previously selected by the Brachiaria breeding program, were evaluated in 2013 and 2014 for phenological characteristics and seed production potential through their production components, aiming to obtain cultivars with satisfactory production agronomic characteristics and forage yield, resistant to 'cigarrinhas-das-pastagens' (Tomaspia sp.) and good seed production. Estimates of phenotypic correlation and analysis of variance were performed using the SAS 9.3 software. From the results obtained in both consecutive years, it was observed that there was a correlation between the reproductive tiller number (RT) and the pure seeds (PS) weight in the seedbeds of the second year of production around 70% (p < 0.01), which can be considered as a parameter to estimate the production of pure seeds before the start of flowering.Híbridos intraespecíficos de Brachiaria decumbens: caracterização e seleção para produção de sementes RESUMO -Brachiaria decumbens tem grande importância no cenário nacional da pecuária de corte por apresentar alto potencial produtivo forrageiro e alta adaptabilidade a solos ácidos e de baixa fertilidade. Com o intuito de ser obter novas cultivares, híbridos intraespecíficos, previamente selecionados pelo programa de melhoramento de Brachiaria, foram avaliados nos anos de 2013 e 2014, quanto a caracteres fenológicos e potencial de produção de sementes por meio de seus componentes de produção, visando a obtenção de cultivares com características agronômicas satisfatórias de produção e de produtividade de forragem, com resistência às cigarrinhas-das-pastagens e boas produtoras de sementes. As estimativas de correlação fenotípica e análise de variância foram realizadas pelo software SAS 9.3. A partir dos resultados obtidos nos dois anos consecutivos, observou-se que, houve correlação entre número de perfilhos reprodutivos (PR) e peso de sementes puras (SP) nos canteiros do segundo ano de produção em nível de 70% (p<0,01), o que pode ser considerado como parâmetro para se estimar a produção de sementes puras antes do início do florescimento.Termos para indexação: fenologia, apomixia, genótipos, melhoramento de forrageiras.

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Section: Resultsmentioning

confidence: 94%

Brachiaria decumbens intraspecific hybrids: characterization and selection for seed production

et al. 2016

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“…Harvest trials are important for determining yield, regrowth capacity and management systems, as well as adaptability, stability and seasonality of production (Townsend, 2001). Seasonality in production of tropical forages is common, especially in regions with markedly dry seasons, which limits the production of dry matter (Lédo et al, 2008;Souza Sobrinho et al, 2011). For temperate forages, in addition to summer drought, the major limiting factor is the low temperature in winter (Porqueddu et al, 2005).…”

Section: Genotype X Harvest Interactionmentioning

confidence: 99%

About the use of Longitudinal data Analysis in Forage Legumes Breeding: A Review

Miqueloni¹

2019

IJEAB

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Forage breeding is more complex than that practiced in other plant species. In addition to assessing the effect of superior genotypes through animal performance, there is a need to evaluate genetic materials over time, which requires the use of appropriate tools and statistical methods so that al l effects of the environment are captured and analyzed due to the perennial character of these species. Another significant factor with regard to forage legumes is the analysis in pure or mixed stands, which may facilitate the conduction of trials in the first case and improve the adaptive ability evaluation of species with associated plant and the environment effects in the second case. In this context, the interaction of the genotype with the environment, which differs for the temperate and tropical legume species, is discussed from the point of view of the longitudinal data analysis by application of the mixed model methodology, also considering the employment of mixed pastures in the tropical region of the globe. Keywords-Genotype x environment interaction, measures over time, mixed pasture, perennial species, tropical and temperate legumes.

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“…Brachiaria ruziziensis) has great value for pasture diversification, particularly for milk production (Pessoa-Filho et al, 2015). This species has high nutritional quality when compared with other species of this genus (Lopes et al, 2010) and has shown potential for dry biomass yields that range from 12 to 15 tons/ha (Souza Sobrinho, Lédo, & Kopp, 2011). Moreover, this species shows adaptability to non-acid and well drained soils, tolerance to aluminum (Bitencourt et al, 2011;Martins et al, 2011), and resistance to spittlebug (Souza Sobrinho, Auad, & Lédo, 2010a).…”

Section: Introductionmentioning

confidence: 99%

Visual selection of Urochloa ruziziensis genotypes for green biomass yield

et al. 2019

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The breeding program of Urochloa ruziziensis evaluates many genotypes in initial phases. Evaluations through grades might make the selection less costly. The aim of this study was to verify the efficiency of visual selection for green biomass yield in relation to different selection strategies, such as mass selection by phenotypic mean, BLUP (Best Linear Unbiased Prediction) and at random. For this purpose, 2,309 regular genotypes were evaluated in an augmented block design in two cuts. The evaluators gave grades for plant vigor, and later, the plots were measured for green biomass yield. The coincidences of the selected genotypes were estimated by different selection strategies. Then, 254 clones of the genotypes selected in different strategies were evaluated in a clonal test in a triple lattice design in four cuts. The statistical analyses were performed in SAS using the Mixed procedure. The regular genotype level and clone-mean basis heritabilities were 31.16 and 62.91%, respectively, for green mass yield. The expected selection gains were 21.09% (visual), 25.43% (phenotypic mean), and 27.5% (BLUP). Moreover, the realized heritabilities for these strategies were 15.58, 11.87, and 15.86%, respectively, which might be associated with genotype by environment interaction. Therefore, the visual selection could be a useful strategy in initial phases of a U. ruziziensis breeding program because the efficiency was moderate to high in relation to phenotypic mean and BLUP.

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Estacionalidade e estabilidade de produção de forragem de progênies de Brachiaraia ruziziensis

Cited by 13 publications

References 7 publications

Brachiaria decumbens intraspecific hybrids: characterization and selection for seed production

Brachiaria decumbens intraspecific hybrids: characterization and selection for seed production

About the use of Longitudinal data Analysis in Forage Legumes Breeding: A Review

Visual selection of Urochloa ruziziensis genotypes for green biomass yield

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