Title:	Genetic parameters for drought-tolerance in cassava.
Authors:	OLIVEIRA, E. J. de AIDAR, S. de T. MORGANTE, C. V. CHAVES, A. R. de M. CRUZ, J. L. COELHO FILHO, M. A.
Affiliation:	EDER JORGE DE OLIVEIRA, CNPMF; SAULO DE TARSO AIDAR, CPATSA; CAROLINA VIANNA MORGANTE, CPATSA; AGNALDO RODRIGUES DE MELO CHAVES, CPATSA; JAILSON LOPES CRUZ, CNPMF; MAURICIO ANTONIO COELHO FILHO, CNPMF.
Date Issued:	2015
Citation:	Pesquisa Agropecuária Brasileira, Brasília, DF, v. 50, n. 3, p. 233-241, mar. 2015.
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.
Thesagro:	Mandioca Melhoramento vegetal Manihot Esculenta
NAL Thesaurus:	Breeding Cassava Water stress
Keywords:	Estresse hídrico Melhoramento de planta
ISSN:	0100-204X
DOI:	10.1590/S0100-204X2015000300007
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPATSA)