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The present study shows the results of a completed first cycle of recurrent selection in a middle late synthetic population “1/2017” and the inbred lines PAU 1617 and B 113 are used as a recurrent parents. The aim of the improving selection is to obtain from the synthetic inbred lines which are later to be used as parental forms for receiving hybrids of this maturity group.  The experimental work was carried out in the period 2017 – 2019 when two hundred and ten testcrosses were tested. After the data was analyzed, eighty even inbred progeny variants displaying the best results have been included for crosspollination and a new cycle of breeding. The genetic variability in the synthetic has been preserved as the selected progeny represent 41,4 % of the initially chosen ones. The index of variability after recurrent selection is 12,2 % which allows for efficient testing in the subsequent stages of the improving selection.  As a direct outcome of the research, thirteen crosses have been pointed out – B 113 x 37/1, B 113 x 25/5, PAU 1617 x 71/3, B 113 x 29/1, B 113 x 33/1, PAU 1617 x 97/3, PAU 1617 x 85/3, B 113 x 71/5, B 113 x 71/6, B 113 x 53/1, B 113 x 55/1, B 113 x 77/3 and B 113 x 43/1. They exceed in grain yield the foreign standard in the maturity group respectively with 25.2, 20.0, 16.9, 16.6, 15.1, 15.0, 13.1, 12.5, 10.5, 9.0, 8.8, 8.8 and 8.2%. They are still tested in varietal and ecological trials.

Use of recurrent selection in middle late synthetic maize populations. results of the first cycle in synthetic “1/2017”