02130naa a2200313 a 450000100080000000500110000800800410001902200140006002400410007410000230011524500570013826000090019552012510020465000130145565000120146865000170148065000160149765000130151365000220152665000250154865300220157365300270159570000200162270000200164270000240166270000160168670000240170277300900172620226002016-01-28       2015    bl uuuu     u00u1 u    #d  a0100-204X7 a10.1590/S0100-204X20150003000072DOI1 aOLIVEIRA, E. J. de  aGenetic parameters for drought-tolerance in cassava.  c2015  aThe 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.  aBreeding  aCassava  aWater stress  aGermoplasma  aMandioca  aManihot Esculenta  aMelhoramento vegetal  aEstresse hídrico  aMelhoramento de planta1 aAIDAR, S. de T.1 aMORGANTE, C. V.1 aCHAVES, A. R. de M.1 aCRUZ, J. L.1 aCOELHO FILHO, M. A.  tPesquisa Agropecuária Brasileira, Brasília, DFgv. 50, n. 3, p. 233-241, mar. 2015.