Recurrent selection in doubled-haploid populations of barley (Hordeurn vulgare L.)

Abstract

Cycle zero (Co) of recurrent selection in barley (H. vulgare L.) was initiated by diallel mating of seven highly selected parents. A total of 398 doubled-haploid (C1DH) lines were derived from 21 crosses and were evaluated along with their parents in Co experiment. Seven doubled-haploid lines (DH) were selected from the cycle zero (Co) experiment and intercrossed to form cycle I (C1). From the 21 crosses of the diallel, 260 doubled-haploid lines (C1DH) were derived and were evaluated along with the Co and C1 parents. The frequency distribution of the standardized means of the DH lines from Co and C1 indicated a slight response to selection for seed yield. Genetic analysis of the C1DH population showed high additive genetic variance for yield per hill, plant height, and yield per spike, and a high proportion of additive .times. additive epistasis for spikes per hill, days to heading, and 100-seed weight. Seven doubled-haploid lines were selected from different high-yielding crosses represented by C1DH lines. High selection pressure was applied for yield per hill, yield per spike, and spikes per hill. Further response to selection is expected in later cycles. The 7 selected doubled-haploid lines will be used as the parents of the next recurrent selection cycle.