02002naa a2200313 a 450000100080000000500110000800800410001902400380006010000260009824501170012426000090024152010340025065000240128465000160130865000110132465000350133565000250137065300220139565300360141765300240145365300100147765300150148770000210150270000180152370000200154170000190156170000320158077300760161220682792017-08-31       2017    bl uuuu     u00u1 u    #d7 a10.1590/1984-70332017v17n2n22DOI1 aOLIVEIRA, A. E. S. de  aGenetic gain of Valenciana onion populations developed in the Brazilian Semi-Arid region.h[electronic resource]  c2017  aThe aim of the present study was to estimate the genetic improvement in the last recurrent selection cycles applied in two Valenciana onion populations in Petrolina, PE. The experiments were carried out between October 2014 and January 2015, in Petrolina and Juazeiro, BA. The experiment consisted of a randomized block design, with 12 treatments and three replications. Analyses of variances were carried out separately for each population. The control population CNPH6400 was the comparison basis. Heritability and genetic gain were estimated for total (Prototal) and commercial (Procom) bulb yields. Significant differences were observed for Prototal and Procom in both populations and in both environments, except for the 25CA10 population, in Juazeiro. The highest Procom genetic gains were observed in Petrolina for 25CA10 and T811CR13 populations (510.5% and 522.1%, respectively), proving the efficiency of recurrent selection cycles. Genetic gains were nonlinear, and fluctuations may have occurred due to genetic drift.  aGenetic improvement  aAllium Cepa  aCebola  aMelhoramento genético vegetal  aSeleção Recorrente  aCebola valenciana  aCiclos de seleção recorrentes  aGenotypic stability  aOnion  aSemiárido1 aSANTOS, C. A. F.1 aLUZ, L. N. da1 aOLIVEIRA, V. R.1 aCANDEIA, J. A.1 aCARVALHO FILHO, J. L. S. de  tCrop Breeding and Applied Biotechnologygv. 17, n. 2, p. 168-174, 2017.