Development and Evaluation of Sunflower Synthetic Varieties (Helianthus annuus L.)

The Journal of Environmental studies (JES) 
Vol.22: 28-39 (22), 12 pages
Author:Attia, M. A., Bakheit B. R., Abo-Elwafa A., 'and El-Shimy A. A.
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This study was carried out in the summer seasons of 2010, 2011, 2012 and 2013, respectively, at Shandaweel Agriculture Research Station, Agri. Res. Center. The main objectives of the present investigation are to improve population Giza102 of sunflower through development of synthetic varieties by S1 per se family, Half-sib and Top-crosses recurrent selection procedure. In 2013 season, the first cycle of selection (C1) per se, H.S and T.C selection methods were evaluated against the original population Giza102 and check variety Sakha53 at Shandaweel and Assiut Agric. Res. Sta. Randomized Complete Block Design (RCBD) with 3 replications were used in the two locations, to measure the actual gain from selection. Data were recorded on days to 50 % flowering, days to maturity, plant height, stalk diameter, head diameter, 100-achene weight, achene yield/plant, achene yield/plot and oil content. Highly significant differences between the two locations  were  detected for  the  studied  traits. The  combined  means over  two locations  of  oil content were 42.00, 43.37, 41.37, 39.91 and 39.98 (%), for S1-cycle. H.S, T.C, original pop. and check variety, respectively. The differences between the three methods selection were significant, except between S1 and T.C-cycle was not significant, but the differences between the first cycle selection, original pop. and check variety were significantly increased, except between the T.C-cycle and original pop. and check variety was not significantly increased. With respect to oil content, the observed gain from selection for S1 and H.S family selection methods (5.24% and 8.67%), respectively, were higher than those of T.C (3.66%) selection method. Finally, the S1 per se and H.S selection methods were more effective in improvement the population Giza102 of sunflower than the T.C method.




Sunflower, Helianthus annuus, S1 selection, Synthetic varieties, H.s selection, Top crosses selection.