Effects of reciprocal recurrent selection on some early maize populations for use as a second crop

Sarca, T.; Ciocazanu, I.

Probleme de Genetica Teoretica si Aplicata 18(2): 109-127


Accession: 001582347

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The experimental synthetic populations 5, 25, 29 and 57, obtained by crossing 4 selected pollinator lines with up to 86 other lines each, were compared at 4 sites in Romania with the hybrid progenies of crosses between these populations after 1, 2 or 3 cycles of selection for suitability for use as a second crop (selection for earliness, lodging resistance and yield in late, irrigated cultivation). In every case, before selection, grain yield in the hybrid populations showed positive heterosis relative to the midparental values. In most cases after 1 cycle of selection and in every case after 2 or 3 cycles, the hybrid populations outyielded the synthetics. In the synthetics, the average gain in yield per cycle of selection varied from -6% to +10%; in the hybrid progenies it varied from 2.2% to 6.1%. The advance was significant in the hybrid populations 5 X 25 and 5 X 57. There were indications that the constituent populations of each parental pair differed in the frequency of yield-related dominant alleles. It is concluded that concurrent selection in several characters need not result in a drop in the selection pressure for higher yield.