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Abstract 54 SUMMARY Six genetically different varieties of bar crossed in a diallel mating design, excluding ree F 1’s formed the experimental materials. Th randomized complete block design with fou materials were evaluated at Giza Research Stati Ten competitive plants were selected random! observation on days to heading, plant height, n weight, total biomass production per plant and gr The combining ability analysis for each tr the method proposed by Griffing (1956). Cor for combining ability ’and its interactions with en method described by Singh (1973). The obtained results can be summarized as f • The ordinary analysis of variance rev among genotypes for all studied characn General combining ability variances characters under both E I, E2 as well as Specific combining ability variances v under study except ofbiomass productior General and specific combining ability among parents and hybrids for the inves Some of the parental lines could progenitors for high expression of the l • • • • (Hordeum vulgare L.) were ’cals. The six parents and their xperiment was laid out with eplications, The experimental ARC under two sowing dates. om each plot for recording the f spikes per plant, 1000 kernel yield per plant. nent was carried out following led analysis over environments nments were conducted by the ws: d highly significant differences ere significant for all studied r environments. significant for all characters . plant under late planting date. ects were frequently significant ted characters. effectively used as promising acters under consideration and 55 that specific combinations with high ormance could be exploited in hybrid production program. • Evaluation of different parental line :Or general combining ability revealed that: • Athanians for earliness. Giza 123 for tallness, 1000 kern! production per plant. California Mariout for earliness, 1 biomass production per plant and m C.C. 89 for tallness, more spikes pe total biomass production per plant I Evaluation of specific combining abili investigated characters indicated tha ability effects for grain yield per plant, kernel weight were registered by the parent no. 6. The cross combinations characterized effects involved at least one paren therefore, could be useful for varietal ir The bahaviour of a parent in cross COl own performance, revealing the pot combiners on the basis of their own pel Varieties of Egyptian sources were fi and yield components. Giza 123, C.I be included in the national breeding pn • • • zeight and more total biomass e spikes per plant, more total grain yield. ant, heavy kernel weight, more grain yield per plant. effects of different hybrids for e greatest specific combining j biomass production and 1000 )SS between parent no. 4 and , high specific combining ability • good general combiner and, wement purpose. lations generally agreed with its lity of selecting good general mance. I to be good combiners for yield 9 and California Mariout should un to improve yield character |