Diallel cross analysis for some quantitative traits in yellow maize under stress and normal irrigation treatments I. biochemical genetic markers for heterosis and combining ability [electronic resource].

Includes references.

5XS half diallel cross along with their parental maize inbred lines were evaluated under normal and drought environments. The obtained data revealed highly significant differences between environments for all studied traits. Partitioning of genetic variations of crosses into parents and their hybrids showed that variance due to general combining ability (GCA) was significant for all studied trails under both environments and for their combined analysis except for ear length under normal environments and the combined analysis and 100 kenrels weight under drought Variance due to specific combining ability (SCA) was significant for an studied wits under both environments and their combined analysis except for number of rows/ear under' both environments and their combined data and 100-kunels weight for the combined analysis. The ratio of GCMS'CA revealed that the hugest part of the total genetic variability was mainly due to no additive gene action for most of the studied traits under normal and drought environments. Mean squares due to the interaction between each of GCA and SCA with environments were highly signification for an studied traits except for ear length, ear diameter, 1UI1t'IIJer of kernels per row and 100-kemels weight for GCA. x environment and number of rows per ear for SCA x environment indicating that, both additive and non-additive gene effects were influenced by environments. The best general combiners for 1f1'ain yield per plant and two or more of its attributes were the inbred lines PI and P4 under normal conditions and P3 under drought conditions. Six out of ten crosses under normal conditions and three crosses under drought conditions showed positive and significant SCA effects for grain yield per plant and two or more of its attributes. In this regard, the best Fl cross was PI x P4 under both normal and drought conditions. The electrophoretic paterns (SDS¬ PAGE) for water soluble proteins of the five maize inbred lines and their ten Fl hybrids showed that, the electrophoretic bands could be a useful tool for the identification and characterization of the used five inbred lines of yellow maize. Using soluble leaves protein electrophoresis could he effect We in the identification of the highly heterotic hybrids and those having high specific combining ability ,geds under drought conditions as biochemical genetic markers associated with hybrid vigor and Specific combining ability in yellow maize hybrids.

Summary in Arabic.

1