Abstract
This investigation was carried out at Sakha Agricultural Research Station Farm, ARC, Egypt during the two growing summer seasons (2015 and 2016). Six parents namely; Line 4, Line 10, Line 16, Line 17, Line 63 and Giza 102, were crossed in half diallel mating design, giving a total of 15 crosses, which were evaluated under three water treatments; (T1) normal irrigation every 14 days, irrigation every 21 days (T2) and irrigation every 28 days (T3) and compared with a check variety namely; Sakha 53. Through this study, general and specific combining ability were estimated for earliness attributes, yield and its components, seed oil percent and oil yield. Data revealed that, most of the variance due toirrigation treatments (I), genotypes (G), G × I, crosses (Cr), (GCA), (SCA), Crosses × I, GCA × I and SCA × I, showed highly significant differences for most traits under the three irrigation treatments and their combined analysis. The parents; (Giza 102) and (Line 63) considered as good combiners for earliness under the three irrigation treatments and their combined analysis. The parents; (Line 4), (Line 10), (Giza 102) and (Line 63) considered as good combiners for yield and its components under the three water treatments and their combined analysis. These parents could be used in breeding program aiming to regenerate genotype (s) characterized by high seed and oil yields. Based on the estimates of (s^ij), it could be summarized that the best crosses were; (Line 10 x Giza 102) and (Line17 x Giza 102) for earliness under T1, T2 and T3 and their combined data. For yield and yield components, the crosses; (Line 4 x Line 63), (Line 17 x Line 63), (Line 16 x Line 17), (Line 10 x Giza 102) and (Line 4 x Giza 102) under T1, T2, T3 and their combined data are the best crosses. These parents and crosses could be used as a hybrid varieties in sunflower cultivation under water stress conditions to cover a part of oil production gap in Egypt.
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