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 | Acesso ao texto completo restrito à biblioteca da Embrapa Recursos Genéticos e Biotecnologia. Para informações adicionais entre em contato com cenargen.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Recursos Genéticos e Biotecnologia. |
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Data corrente: |
22/01/2025 |
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Data da última atualização: |
22/01/2025 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
COSTA, W. G. da; SOUZA, M. B. e; AZEVEDO, C. F.; NASCIMENTO, M.; MORGANTE, C. V.; BOREL, J. C.; OLIVEIRA, E. J. de. |
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Afiliação: |
WEVERTON GOMES DA COSTA, UNIVERSIDADE FEDERAL DE VIÇOSA; MASSAINE BANDEIRA E SOUZA, NUGENE; CAMILA FERREIRA AZEVEDO, UNIVERSIDADE FEDERAL DE VIÇOSA; MOYSES NASCIMENTO, UNIVERSIDADE FEDERAL DE VIÇOSA; CAROLINA VIANNA MORGANTE, CENARGEN; JERÔNIMO CONSTANTINO BOREL, UNIVERSIDADE FEDERAL DO VALE DO SÃO FRANCISCO; EDER JORGE DE OLIVEIRA, CNPCA. |
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Título: |
Optimizing drought tolerance in cassava through genomic selection. |
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Ano de publicação: |
2024 |
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Fonte/Imprenta: |
Frontiers in Plant Science, v. 15, 2024. |
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DOI: |
https://doi.org/10.3389/fpls.2024.1483340 |
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Idioma: |
Inglês |
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Conteúdo: |
The complexity of selecting for drought tolerance in cassava, influenced by multiple factors, demands innovative approaches to plant selection. This study aimed to identify cassava clones with tolerance to water stress by employing truncated selection and selection based on genomic values for population improvement and genotype evaluation per se. The Best Linear Unbiased Predictions (BLUPs), Genomic Estimated Breeding Values (GEBVs), and Genomic Estimated Genotypic Values (GETGVs) were obtained based on different prediction models via genomic selection. The selection intensity ranged from 10 to 30%. A wide range of BLUPs for agronomic traits indicate desirable genetic variability for initiating genomic selection cycles to improve cassava’s drought tolerance. SNP-based heritability (h2) and broad-sense heritabilities (H2) under water deficit were low magnitude (<0.40) for 8 to 12 agronomic traits evaluated. Genomic predictive abilities were below the levels of phenotypic heritability, varying by trait and prediction model, with the lowest and highest predictive abilities observed for starch content (0.15 – 0.22) and root length (0.34 – 0.36). Some agronomic traits of greater importance, such as fresh root yield (0.29 – 0.31) and shoot yield (0.31 – 0.32), showed good predictive ability, while dry matter content had lower predictive ability (0.16 – 0.22). The G-BLUP and RKHS methods presented higher predictive abilities, suggesting that incorporating kinship effects can be beneficial, especially in challenging environments. The selection differential based on a 15% selection intensity (62 genotypes) was higher for economically significant traits, such as starch content, shoot yield, and fresh root yield, both for population improvement (GEBVs) and for evaluating genotype’s performance per (GETGVs). The lower costs of genotyping offer advantages over conventional phenotyping, making genomic selection a promising approach to increasing genetic gains for drought tolerance in cassava and reducing the breeding cycle to at least half the conventional time. MenosThe complexity of selecting for drought tolerance in cassava, influenced by multiple factors, demands innovative approaches to plant selection. This study aimed to identify cassava clones with tolerance to water stress by employing truncated selection and selection based on genomic values for population improvement and genotype evaluation per se. The Best Linear Unbiased Predictions (BLUPs), Genomic Estimated Breeding Values (GEBVs), and Genomic Estimated Genotypic Values (GETGVs) were obtained based on different prediction models via genomic selection. The selection intensity ranged from 10 to 30%. A wide range of BLUPs for agronomic traits indicate desirable genetic variability for initiating genomic selection cycles to improve cassava’s drought tolerance. SNP-based heritability (h2) and broad-sense heritabilities (H2) under water deficit were low magnitude (<0.40) for 8 to 12 agronomic traits evaluated. Genomic predictive abilities were below the levels of phenotypic heritability, varying by trait and prediction model, with the lowest and highest predictive abilities observed for starch content (0.15 – 0.22) and root length (0.34 – 0.36). Some agronomic traits of greater importance, such as fresh root yield (0.29 – 0.31) and shoot yield (0.31 – 0.32), showed good predictive ability, while dry matter content had lower predictive ability (0.16 – 0.22). The G-BLUP and RKHS methods presented higher predictive abilities, suggesting that incorporating kinship effects can be ben... Mostrar Tudo |
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Palavras-Chave: |
Genomic values; Genotype selection; Manihot esculenta Crantz; Mixed model. |
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Thesaurus Nal: |
Breeding. |
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Categoria do assunto: |
-- |
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Marc: |
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Embrapa Recursos Genéticos e Biotecnologia (CENARGEN) |
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