Genetic gain in apomictic species of the genus Paspalum

Pereira, Érico Felden; Dall'Agnol, Miguel; Saraiva, Karla Médici; Simioni, Carine; Leães, Ana Paula Steiner; Silva, José Antônio Gonzalez da

doi:10.1590/0034-737x201764010009

Cited by 6 publications

(4 citation statements)

References 25 publications

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“…For individual harvests, the same authors found a narrow-sense heritability of 0.05 for LDM. Similar to our results, broad-sense heritabilities were reported in Paspalum for LDM with 0.82 and PLB with 0.55 (Pereira et al 2017). In respect to the nutritive traits, moderate values were reported by Matias et al (2016) for narrow-sense heritability considering the mean of seven harvests in Brachiaria decumbens progenies for CP (0.31) and IVD (0.14).…”

Section: Discussionsupporting

confidence: 92%

Genomic Selection with Allele Dosage in Panicum maximum Jacq.

Lara

Santos

Jank

et al. 2019

G3 Genes|Genomes|Genetics

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Genomic selection is an efficient approach to get shorter breeding cycles in recurrent selection programs and greater genetic gains with selection of superior individuals. Despite advances in genotyping techniques, genetic studies for polyploid species have been limited to a rough approximation of studies in diploid species. The major challenge is to distinguish the different types of heterozygotes present in polyploid populations. In this work, we evaluated different genomic prediction models applied to a recurrent selection population of 530 genotypes of Panicum maximum , an autotetraploid forage grass. We also investigated the effect of the allele dosage in the prediction, i.e. , considering tetraploid (GS-TD) or diploid (GS-DD) allele dosage. A longitudinal linear mixed model was fitted for each one of the six phenotypic traits, considering different covariance matrices for genetic and residual effects. A total of 41,424 genotyping-by-sequencing markers were obtained using 96-plex and Pst 1 restriction enzyme, and quantitative genotype calling was performed. Six predictive models were generalized to tetraploid species and predictive ability was estimated by a replicated fivefold cross-validation process. GS-TD and GS-DD models were performed considering 1,223 informative markers. Overall, GS-TD data yielded higher predictive abilities than with GS-DD data. However, different predictive models had similar predictive ability performance. In this work, we provide bioinformatic and modeling guidelines to consider tetraploid dosage and observed that genomic selection may lead to additional gains in recurrent selection program of P. maximum .

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Section: Discussionsupporting

confidence: 92%

Genomic Selection with Allele Dosage in Panicum maximum Jacq.

Lara

Santos

Jank

et al. 2019

G3 Genes|Genomes|Genetics

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“…Studies carried out by Entringer et al (2014) and Carvalho et al (2017) found satisfactory gains using both direct and indirect selection, since the traits showed favorable correlation. Falconer (1987) highlighted that indirect selection may promote greater gains; the same was evidenced by Pereira et al (2017), who studied the genus Paspalum.…”

Section: Discussionmentioning

confidence: 88%

Selection gain and interrelations between agronomic traits in wheat F5 genotypes

et al. 2019

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This work aimed to estimate the variance components and genetic parameters, the selection gain, and the cause and effect relationships among traits in order to identify important traits for direct and indirect selection of wheat (Triticum aestivum L.) lines. Three strategies were used to obtain selection gains: direct and indirect selection, an index based on "ranks," and the Smith and Hazel index. In the 2017 crop season in Brazil, 420 wheat lines from the F 5 generation were conducted in families with intercalary controls. High heritability of spike weight, number of kernels, and total kernel weight resulted in the best direct selection gains. The selection of plants with a high number of tillers resulted in grain yield improvement. The use of selection indexes is important in advanced wheat lines; they promote genetic gains distributed among agronomic traits.

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“…In evaluating seed production of Dactylis glomerata L. populations, Şeker et al (2014) found high heritability values (0.64), which showed strong genetic control of the trait at an individual level, suggesting that environmental factors had a little effect on heredity. However, the selection efficacy depends not only on heritability but also on genetic advancement (Pereira et al, 2017). The high coefficient of genetic variation in conjunction with high heritability provides more information than other parameters alone (Shabanimofrad et al, 2013).…”

Section: Discussionmentioning

confidence: 99%

Genetic assessment of seed yield-related traits in superior hybrids of Paspalum plicatulum × Paspalum guenoarum

et al. 2019

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This study aimed to estimate the genetic parameters, genetic correlations, genetic dissimilarity, and predicted gains with the selection of interspecific apomictic Paspalum plicatulum × Paspalum guenoarum hybrids in relation to seed yield traits. Nineteen genotypes that showed increased forage yield in previous studies were planted in a randomized complete block design with ten blocks. Traits evaluated in this study were: number of tillers/plant, number of reproductive tillers/plant, number of racemes/inflorescence, number of seeds/inflorescence, weight of a thousand seeds, and seed yield. Data were analyzed using a mixed model approach. The genotypes evaluated in our study showed improvement potential in relation to high heritability (H 2 g > 0.50), high precision (Acgen> 90%), and genetic dissimilarity (forming three groups) for seed yield traits. Seed yield showed high correlation to reproductive tillers that can be used as indirect selection tools for genetic improvement of seed yield.

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Genetic gain in apomictic species of the genus Paspalum

Cited by 6 publications

References 25 publications

Genomic Selection with Allele Dosage in Panicum maximum Jacq.

Genomic Selection with Allele Dosage in Panicum maximum Jacq.

Selection gain and interrelations between agronomic traits in wheat F5 genotypes

Genetic assessment of seed yield-related traits in superior hybrids of Paspalum plicatulum × Paspalum guenoarum

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