Genetic parameters for drought‑tolerance in cassava
Autor(a) principal: | |
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Data de Publicação: | 2015 |
Outros Autores: | , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Pesquisa Agropecuária Brasileira (Online) |
Texto Completo: | https://seer.sct.embrapa.br/index.php/pab/article/view/20341 |
Resumo: | The objective of this work was to evaluate the effect of drought on genetic parameters and breeding values of cassava. The experiments were carried out in a completely randomized block design with three replicates, under field conditions with (WD) or without (FI) water deficit. Yield of storage roots (RoY), shoot (ShY), and starch (StY), as well as the number of roots (NR), and root dry matter content (DMC) were evaluated in 47 cassava accessions. Significant differences were observed among accessions; according to heritability, these differences had mostly a genetic nature. Heritability estimates for genotypic effects () ranged from 0.25±0.12 (NR) to 0.60±0.18 (DMC), and from 0.51±0.17 (NR) to 0.80±0.21 (RoY and StY) for WD and FI, respectively, as a consequence of greater environmental influence on WD. Selective accuracy was lower in WD, and ranged from 0.71 (NR) to 0.89 (RoY, DMC, and StY). However, genetic gains were quite high and ranged from 24.43% (DMC) to 113.41% (StY), in WD, and from 8.5% (DMC) to 75.70% (StY) in FI. These genetic parameters may be useful for defining which selection strategies, breeding methods, and experimental designs are more suitable to obtain cassava genetic gains for tolerance to drought. |
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Genetic parameters for drought‑tolerance in cassavaParâmetros genéticos da mandioca quanto à tolerância ao deficit hídricoManihot esculenta; breeding; drought stress; germplasmManihot esculenta; melhoramento; estresse hídrico; germoplasmaThe objective of this work was to evaluate the effect of drought on genetic parameters and breeding values of cassava. The experiments were carried out in a completely randomized block design with three replicates, under field conditions with (WD) or without (FI) water deficit. Yield of storage roots (RoY), shoot (ShY), and starch (StY), as well as the number of roots (NR), and root dry matter content (DMC) were evaluated in 47 cassava accessions. Significant differences were observed among accessions; according to heritability, these differences had mostly a genetic nature. Heritability estimates for genotypic effects () ranged from 0.25±0.12 (NR) to 0.60±0.18 (DMC), and from 0.51±0.17 (NR) to 0.80±0.21 (RoY and StY) for WD and FI, respectively, as a consequence of greater environmental influence on WD. Selective accuracy was lower in WD, and ranged from 0.71 (NR) to 0.89 (RoY, DMC, and StY). However, genetic gains were quite high and ranged from 24.43% (DMC) to 113.41% (StY), in WD, and from 8.5% (DMC) to 75.70% (StY) in FI. These genetic parameters may be useful for defining which selection strategies, breeding methods, and experimental designs are more suitable to obtain cassava genetic gains for tolerance to drought.O objetivo deste trabalho foi avaliar o efeito do deficit hídrico sobre os parâmetros e os valores genéticos da mandioca. Os experimentos foram realizados em delineamento de blocos ao acaso com três repetições, em campo com (CD) ou sem deficit hídrico (SD). A produtividade de raízes (PR), da parte aérea (PA) e de amido (PAM), assim como o número de raízes (NR) e a massa de matéria seca das raízes (MS) foram avaliados em 47 acessos de mandioca. Observaram-se diferenças significativas entre os acessos; conforme a herdabilidade, estas diferenças foram em sua maioria de natureza genética. As estimativas de herdabilidade dos efeitos genotípicos () variaram de 0,25±0,12 (NR) a 0,60±0,18 (MS) e de 0,51±0,17 (NR) a 0,80±0,21 (PR e PAM) para CD e SD, respectivamente, em decorrência da maior influência ambiental sobre o CD. A acurácia seletiva foi menor no CD, com variação de 0,71 (NR) a 0,89 (PR, MS e PAM). No entanto, os ganhos genéticos foram elevados, de 24,43% (MS) a 113,41% (PAM) no CD, e de 8,5% (MS) a 75,70% (PAM) no SD. Estes parâmetros genéticos podem ser úteis para definir estratégias de seleção, métodos de melhoramento e delineamentos experimentais mais apropriados, para a obtenção de ganhos genéticos em mandioca quanto à tolerância à seca.Pesquisa Agropecuaria BrasileiraPesquisa Agropecuária BrasileiraFundação de Amparo à Pesquisa do Estado da Bahia (Fapesb), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado da Bahia (Fapesb), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Oliveira, Eder Jorge deAidar, Saulo de TarsoMorgante, Carolina VianaChaves, Agnaldo Rodrigues de MeloCruz, Jailson LopezCoelho Filho, Maurício Antônio2015-04-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfhttps://seer.sct.embrapa.br/index.php/pab/article/view/20341Pesquisa Agropecuaria Brasileira; v.50, n.3, mar. 2015; 233-241Pesquisa Agropecuária Brasileira; v.50, n.3, mar. 2015; 233-2411678-39210100-104xreponame:Pesquisa Agropecuária Brasileira (Online)instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa)instacron:EMBRAPAenghttps://seer.sct.embrapa.br/index.php/pab/article/view/20341/12887https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/20341/12504info:eu-repo/semantics/openAccess2015-04-10T19:29:25Zoai:ojs.seer.sct.embrapa.br:article/20341Revistahttp://seer.sct.embrapa.br/index.php/pabPRIhttps://old.scielo.br/oai/scielo-oai.phppab@sct.embrapa.br || sct.pab@embrapa.br1678-39210100-204Xopendoar:2015-04-10T19:29:25Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)false |
dc.title.none.fl_str_mv |
Genetic parameters for drought‑tolerance in cassava Parâmetros genéticos da mandioca quanto à tolerância ao deficit hídrico |
title |
Genetic parameters for drought‑tolerance in cassava |
spellingShingle |
Genetic parameters for drought‑tolerance in cassava Oliveira, Eder Jorge de Manihot esculenta; breeding; drought stress; germplasm Manihot esculenta; melhoramento; estresse hídrico; germoplasma |
title_short |
Genetic parameters for drought‑tolerance in cassava |
title_full |
Genetic parameters for drought‑tolerance in cassava |
title_fullStr |
Genetic parameters for drought‑tolerance in cassava |
title_full_unstemmed |
Genetic parameters for drought‑tolerance in cassava |
title_sort |
Genetic parameters for drought‑tolerance in cassava |
author |
Oliveira, Eder Jorge de |
author_facet |
Oliveira, Eder Jorge de Aidar, Saulo de Tarso Morgante, Carolina Viana Chaves, Agnaldo Rodrigues de Melo Cruz, Jailson Lopez Coelho Filho, Maurício Antônio |
author_role |
author |
author2 |
Aidar, Saulo de Tarso Morgante, Carolina Viana Chaves, Agnaldo Rodrigues de Melo Cruz, Jailson Lopez Coelho Filho, Maurício Antônio |
author2_role |
author author author author author |
dc.contributor.none.fl_str_mv |
Fundação de Amparo à Pesquisa do Estado da Bahia (Fapesb), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado da Bahia (Fapesb), Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) |
dc.contributor.author.fl_str_mv |
Oliveira, Eder Jorge de Aidar, Saulo de Tarso Morgante, Carolina Viana Chaves, Agnaldo Rodrigues de Melo Cruz, Jailson Lopez Coelho Filho, Maurício Antônio |
dc.subject.por.fl_str_mv |
Manihot esculenta; breeding; drought stress; germplasm Manihot esculenta; melhoramento; estresse hídrico; germoplasma |
topic |
Manihot esculenta; breeding; drought stress; germplasm Manihot esculenta; melhoramento; estresse hídrico; germoplasma |
description |
The objective of this work was to evaluate the effect of drought on genetic parameters and breeding values of cassava. The experiments were carried out in a completely randomized block design with three replicates, under field conditions with (WD) or without (FI) water deficit. Yield of storage roots (RoY), shoot (ShY), and starch (StY), as well as the number of roots (NR), and root dry matter content (DMC) were evaluated in 47 cassava accessions. Significant differences were observed among accessions; according to heritability, these differences had mostly a genetic nature. Heritability estimates for genotypic effects () ranged from 0.25±0.12 (NR) to 0.60±0.18 (DMC), and from 0.51±0.17 (NR) to 0.80±0.21 (RoY and StY) for WD and FI, respectively, as a consequence of greater environmental influence on WD. Selective accuracy was lower in WD, and ranged from 0.71 (NR) to 0.89 (RoY, DMC, and StY). However, genetic gains were quite high and ranged from 24.43% (DMC) to 113.41% (StY), in WD, and from 8.5% (DMC) to 75.70% (StY) in FI. These genetic parameters may be useful for defining which selection strategies, breeding methods, and experimental designs are more suitable to obtain cassava genetic gains for tolerance to drought. |
publishDate |
2015 |
dc.date.none.fl_str_mv |
2015-04-10 |
dc.type.none.fl_str_mv |
|
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/20341 |
url |
https://seer.sct.embrapa.br/index.php/pab/article/view/20341 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
https://seer.sct.embrapa.br/index.php/pab/article/view/20341/12887 https://seer.sct.embrapa.br/index.php/pab/article/downloadSuppFile/20341/12504 |
dc.rights.driver.fl_str_mv |
info:eu-repo/semantics/openAccess |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
publisher.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira Pesquisa Agropecuária Brasileira |
dc.source.none.fl_str_mv |
Pesquisa Agropecuaria Brasileira; v.50, n.3, mar. 2015; 233-241 Pesquisa Agropecuária Brasileira; v.50, n.3, mar. 2015; 233-241 1678-3921 0100-104x reponame:Pesquisa Agropecuária Brasileira (Online) instname:Empresa Brasileira de Pesquisa Agropecuária (Embrapa) instacron:EMBRAPA |
instname_str |
Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
instacron_str |
EMBRAPA |
institution |
EMBRAPA |
reponame_str |
Pesquisa Agropecuária Brasileira (Online) |
collection |
Pesquisa Agropecuária Brasileira (Online) |
repository.name.fl_str_mv |
Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa) |
repository.mail.fl_str_mv |
pab@sct.embrapa.br || sct.pab@embrapa.br |
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1793416684014403584 |