Selection Methods in Forage Breeding: A Quantitative Appraisal

Simeão, Rosângela Maria; Casler, Michael D.; Resende, Marcos Deon Vilela de

doi:10.2135/cropsci2013.03.0143

Cited by 36 publications

(31 citation statements)

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“…The BLUP method has already been advocated for use in several crop plants (Piepho and Möhring, 2006;Oakey et al, 2006;Viana et al, 2011;Ramalho et al, 2013;Resende et al, 2013). The BLUP method has already been advocated for use in several crop plants (Piepho and Möhring, 2006;Oakey et al, 2006;Viana et al, 2011;Ramalho et al, 2013;Resende et al, 2013).…”

Section: Resultsmentioning

confidence: 99%

Multigeneration Index in the Within‐Progenies Bulk Method for Breeding of Self‐pollinated Plants

et al. 2015

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This study proposes a strategy for improving the bulk method within progenies in self‐pollinated plants. The proposal focuses on the use of a multigeneration index, which considers the whole information across generations and the covariance among successive generations with a view toward identification of the best progenies. The results of the simulation and analysis of field data from common bean (Phaseolus vulgaris L.) were concordant and showed that the estimates of the accuracies were near 85% using the multigeneration index and 70% for the traditional methodology based on comparisons among progeny means of the generation F3:6 or of the last generation evaluated. Another advantage of the index is mitigation of the effect of the genotype × environment interaction, because it considers all the generations of assessment, thus involving interaction of the progenies with the sowing times. When selection is performed using only the information from the last generation assessed, performance of the progenies is inflated by this interaction. The efficiency of the strategy proposed leads to a 12% gain in relation to that which is normally used. This gain is considerable and equivalent in most cases to that which would be obtained through one additional selection cycle. It should be highlighted that this increase is obtained without any additional cost on experimentation, but simply through changing the procedure of identification of the best progenies after successive generations.

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Section: Resultsmentioning

confidence: 99%

Multigeneration Index in the Within‐Progenies Bulk Method for Breeding of Self‐pollinated Plants

et al. 2015

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“…These efforts face a number of questions as to what is the most appropriate breeding procedure for the improvement of biomass given the limited observed historical gains in forage yield (Humphreys, 1997). Knowledge of heritability of within family selection traits is critical to understanding the relative advantages of AWFX compared to among-family selection for biomass yield (Resende et al, 2013). Knowledge of heritability of within family selection traits is critical to understanding the relative advantages of AWFX compared to among-family selection for biomass yield (Resende et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Inheritance of Secondary Morphological Traits for Among‐and‐Within‐Family Selection in Upland Tetraploid Switchgrass

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Casler

2014

Crop Science

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Major efforts are currently being undertaken to improve biomass yield in switchgrass. Among‐and‐within‐family selection has been proposed as an efficient selection scheme to increase rates of genetic gain. The objectives of this study were to estimate the heritability of three yield‐related traits (plant height, tiller count, and flowering date) and evaluate the suitability of those traits as within‐family‐selection criteria. Divergent selections of parents were made for each trait from an upland‐tetraploid population developed for use in temperate North America. Progeny from these selections were used to estimate narrow‐sense heritability by both parent–progeny regression and response to selection. Moderate heritability (0.41) was estimated for plant height but was greater for selection of increased height. Heritability for tiller count was low overall (0.06), with greater values observed for reduced tillering selections. Flowering date was estimated to have high heritability (0.75) overall in both selection directions. Plant height and flowering date both appear heritable on a spaced‐plant basis and may be effective selection criteria for within‐family selection. The relative value of among‐and‐within‐family selection within a practical breeding program will vary depending on what selection criteria are used and the timing of selections.

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“…Similarly important is an analysis of the reproduction system of the species studied here, and the direction given to the pre-breeding studies (characterisation and multiplication), to maintain the individual integrity of the accessions, as well as to choose the breeding method to be employed for creating segregating populations of Stylosanthes for the breeding of this forage crop (RESENDE et al, 2013;RESENDE et al, 2014).…”

Section: Figurementioning

confidence: 99%

GENETIC DIVERSITY IN ACCESSIONS OF Stylosanthes spp. USING MORPHOAGRONOMIC DESCRIPTORS

et al. 2016

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-The great diversity of plants in the Brazilian Semiarid environment represents a vital natural resource for the human populations of these areas. Many of these plants have been subject to extractivism and among these, the species of the genus Stylosanthes, which have occurrence in this region, show great potential, however, studies on this topic are limited, and little is known about the existing variability among these plants. Therefore, further study is necessary, to facilitate the development of cultivars. This might reduce the scarcity of fodder supply in this region, but to commence a plant breeding programme, it is essential to identify genetic variability. Therefore, this study evaluated 25 accessions of Stylosanthes spp., to identify the most suitable candidates to be parents in a plant breeding programme for the semiarid region of the state of Bahia. Two experiments were carried out in different sites in an experimental design of randomized blocks with four replicates, with a spacing of 3.0 × 8.0 m. A large amount of genetic diversity was observed among accessions and the genotypes BGF 08-007, BGF 08-016, BGF 08-015 and BGF 08-021 were the most divergent in the overall evaluation. For the structuring of segregating populations, it is recommended to combine the genotypes BGF 08-016, BGF 08-015, BGF 08-007 and BGF 08-006, and for the interspecific crosses, a hybrid from the accession BGF-024 with the accessions BGF 08-016 or BGF 08-015. This might generate superior individuals for mass descriptors, which are the most important for animal forage breeding.Keywords: Semiarid. Native forage. Morphological descriptors. DIVERSIDADE GENÉTICA EM ACESSOS DE Stylosanthes spp. UTILIZANDO DESCRITORES MORFOAGRONÔMICOSRESUMO -A grande diversidade de plantas do Semiárido representa um recurso natural vital para as populações humanas dessa região. Muitas dessas plantas são exploradas de forma extrativista e entre elas, as espécies do gênero Stylosanthes, que são nativas tem grande potencial, porém, os trabalhos realizados têm sido modestos e pouco se conhece a respeito da variabilidade existente nessas plantas. Por isso, esforços devem ser priorizados no sentido de estudá-las, o que certamente poderá ajudar a criar formas para o desenvolvimento de cultivares e, assim, amenizar a escassez de forragem nessa região. Entretanto, para iniciar trabalhos de melhoramento, primeiro deve-se buscar variabilidade genética. Assim, este trabalho avaliou 25 acessos de Stylosanthes spp., a fim de identificar os melhores para serem genitores no programa de melhoramento genético para o Semiárido baiano. Para isso, foram conduzidos dois experimentos em diferentes locais no delineamento blocos casualizados completos com quatro repetições num espaçamento 3,0 × 0,8 m. Foi constatada grande diversidade genética entre os acessos, sendo que os genótipos BGF 08-007, BGF 08-016, BGF 08-015 e BGF 08-021, mostraram-se como os mais divergentes na avaliação geral. Para a formação de populações segregantes, recomenda-se combinar os genótipos ...

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Selection Methods in Forage Breeding: A Quantitative Appraisal

Cited by 36 publications

References 57 publications

Multigeneration Index in the Within‐Progenies Bulk Method for Breeding of Self‐pollinated Plants

Multigeneration Index in the Within‐Progenies Bulk Method for Breeding of Self‐pollinated Plants

Inheritance of Secondary Morphological Traits for Among‐and‐Within‐Family Selection in Upland Tetraploid Switchgrass

GENETIC DIVERSITY IN ACCESSIONS OF Stylosanthes spp. USING MORPHOAGRONOMIC DESCRIPTORS

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