Data/hora: 15/06/2024 19:10:02

Provedor de dados: | 86
País: | Brazil
Título: | Genetic parameters for drought-tolerance in cassava
Autores: | Oliveira,Eder Jorge de; Aidar,Saulo de Tarso; Morgante,Carolina Viana; Chaves,Agnaldo Rodrigues de Melo; Cruz,Jailson Lopez; Coelho Filho,Maurício Antônio.
Data: | 2015-03-01
Ano: | 2015
Palavras-chave: | Manihot esculenta; Breeding; Drought stress; Germplasm.
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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015000300233

Editor:

Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira

Relação: | 10.1590/S0100-204X2015000300007
Formato: | text/html
Fonte: | Pesquisa Agropecuária Brasileira  v.50 n.3 2015
Fonte: | info:eu-repo/semantics/openAccess