General and specific combining abilities and their interactions with years for eight yellow inbred llnes of maize (Zea mays L.) [electronic resource].

Includes references.

A dialIel Cross among eight selected yellow maize. (zea mays L.) inbred lines was made in 2002. the resulted 28 single crosses in addition .10 two recommended commercial single crosses were evaluated in 2003 and 2004 seasons at the Experimental Farm of Egaseed Company. Minia Egypt. Four agronomic characters and grain yield and its components were recorded on ten competitive plants with each Plot for four replications for each year. Combined analysis of variance was calculated and the variation among sing1e crosses were partitioned into GCA and SCA wing Griffing's method 4 models I (fixed) while the year effect was assumed random The GCA effects were significant for all characters and the SCA effects also were significant. except for number of days tomid-silking. The interactions between GCA and years were significant for eight out of the ten characters under study while SCA x year interaction was significant only for six characters. Calculating the relative contribution of general and specific combining abilities and the environmental interaction with years showed that both interactions of GCA and SCA with years had a small source of variation among single crosses. Both the GCA and SCA were important components with the GCA as. a major Component and SCA as a minor component for the studied characters except for grain yield and number. Of kemels/row .where both types of combining ability were important. Six new single crosses were identified and they were recommended for extensive evaluation.

Summary in Arabic.

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