Combined selection for adaptability, genotypic stability and cowpea yield from mixed models

ABSTRACT: The potential expression of crop productivity is a constant challenge for plant breeders in the face oscillations environmental variables, making selection difficult and increasing operational methodological costs obtaining ideal cultivar determined region. objective research was to investigate effects genotype x environment interaction cowpea lines with high grain yield, adaptability, genotypic stability simultaneously, environments Northwest region Rio de Janeiro State, using mixed models (Maximum Restricted Likelihood - REML/Best Linear Unbiased Prediction BLUP). 27 genotypes were evaluated six by combining location (Cambuci-RJ Bom Jesus do Itabapoana-RJ) year (2016, 2017 2018). A randomized block design four replications performed. genetic parameters estimated via REML/BLUP procedure, based on harmonic mean method relative performance values (HMRPGV). meaningful difference observed interaction. residual variance formed most significant fractions phenotypic variance. Lines 4 (Bico-de-ouro 1-5-24), 6 (Pingo-de-Ouro 1-5-4), 5 1-5-26), 9 1-5-8), stood out as superior terms adaptability yield HMRPGV. Commercial cultivars 13 (BRS-Tumucumaque) 26 (BRS-Itaim) had specific edaphoclimatic conditions.