Determination of combining ability for some new yellow maize inbred lines using line x tester model [electronic resource]

Includes bibliographic reference

This investigation was carried out to study the combining ability effects of 18 parents of maize (15 inbred lines
and 3 testers) crossed in line x tester scheme for phonological, plant and yield characteristics. A yield trial included
the 45 top crosses, 15 inbred lines, 3 testers along with the two check hybrids S.C. 168 and TWC 352. The
experiment was conducted at two planting dates on 15th May and 15th June at the Agric. Res. and Experimental
Station of the Fae. of Agric., Moshtohor Benha University. The randomized complete blocks design with three
replications was used in this study. Significant mean squares due to crosses (C), inbred lines (L), testers (T) and
line x tester (LxT) were found for most studied traits of both and across sowing dates. Variance for C, L, T and
LxT with sowing dates interaction on the most l!tudied traits was significance. ?2scA played the major role in
determining the inheritance of all traits. The magnitude of the interaction of ?2scA x sowing date (SD) was
generally higher than for ?2 acA x SD. This finding indicates that non-additive is more affected by SD than additive
and additive x additive. Three crosses exhibited significant superiority over high check hybrid S.C. G 168. The
best top crosses were T3xL2 and T3xL15 at both and across sowing dates. Also, ten top crosses at combined analysis
did not differ significantly than the best check hybrid forthe mention trait. L2, L7, Ll4 and Ll5 were good general
combiners for grain yield planr1 and L9, L1O and L13 for earliness. The top-cross Tl with each of inbred lines 2,
5 and 6, T2 with each ofLl and Ll2 and T3 with each ofL3,L4 and LI2 for earliness; TlxL11, TlxL12, TlxL14,
T2xL3, T2xL12 and T3xL2 for grain yield plant -1 gave the best s" effects.

Summary in Arabic