Articles

Comparison among three different testers for the evaluation of new maize inbred lines (Zea mays L.)


Abstract


This study aimed to evaluate twenty elite yellow maize inbred lines as well as the suitable tester among three
different. The elite inbred lines were crossed as female parents with three testers as male parents, i.e.Gem.Pop.
(Broad genetic base), Single cross 101(Narrow genetic base) and Inbred line 100 (Narrow genetic base) at the
Experiment Research Station of Moshtohor, Benha University, Egypt during 2014 growing summer season. The
resulting 60 top crosses with three commercial check hybrids i.e. SC.155, SC. Pioneer 3080 and TWC.352 were
evaluated in a yield trail in two sowing dates during 2015 growing summer season. Each experiment was laid out
in randomized complete block design with three replications. The recommended packages of agronomic practices
were followed to achieve a good yield. The morphological and agronomical evaluated traits included ear
diameter (ED), number of rows per ear (NRE), number of kernels per row (NKR), 100-kernel weight (100KW) and
grain yield per acre (1 hectare= 2.5 acre) (GYPA). The results showed significant mean square for sowing dates for
all traits except for (NRE) and (NKR). The parental inbred lines (L-4, L-5, L-10, L-12, L-13, L-14 and L-19) possessed
high GCA effects for grain yield. The inbred tester resulted the best combiner among the testers and expressed
the best SCA effect over all crosses. Therefore, inbred line or single cross tester is preferred as it may permit quicker
utilization of new lines in commercial hybrids especially if the tester is already in commercial use.


Keywords

Zea mays L., Line × Tester, tester type, combining ability, broad genetic base.

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Maydica - A journal devoted to maize and allied species

ISSN: 2279-8013