Genetic parameters for drought‑tolerance in cassava

Detalhes bibliográficos
Autor(a) principal: Oliveira, Eder Jorge de
Data de Publicação: 2015
Outros Autores: Aidar, Saulo de Tarso, Morgante, Carolina Viana, Chaves, Agnaldo Rodrigues de Melo, Cruz, Jailson Lopez, Coelho Filho, Maurício Antônio
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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spelling 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
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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)
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collection Pesquisa Agropecuária Brasileira (Online)
repository.name.fl_str_mv Pesquisa Agropecuária Brasileira (Online) - Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
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