Genetic behavior of grain yield and its components in barley crosses under water stress and non -stress conditions
Journal Title: Scientia Agriculturae - Year 2013, Vol 1, Issue 2
Abstract
Twenty one diallel crosses among seven Egyption barley cultivars showing clear differences in reaction to drought were made and evaluated under full and stress irrigation regimes at the Experimental Station, Faculty of Agriculture, Cairo University, Giza Governorate, Egypt during 2011/2012 and 2012/2013 seasons. The objective was to estimate the mode of gene action in the inheritance, combining ability effects and heterosis for studied traits. Water stress caused significant reductions in all studied traits; with number of spikes per plant of F1's showing maximum reduction (43.07%). Genotypic differences were found in all traits under both irrigation treatments. Giza 123, Giza 126 and F1 cross Giza 126 X Giza 2000 were early maturing as well as having high yielding ability. Giza 2000 X Giza 130 and Giza 129 X Giza 125 had the best yield under both irrigation regimes and the lowest reduction due to drought besides its intermediate earliness. Some crosses showed significant desirable heterobeltiosis for all studied traits under both irrigation regimes. It is interesting to mention that the high positive heterbeltiosis in grain yield/plant was associated with high positive heterobeltiosis in No. S/P and 100-KW for Giza 126 X Giza 2000 and Giza 130 X Giza 131 under stress and non-stress conditions, respectively. The crosses showing the best heterobeltiosis could be recommended to improve the respective traits. Both general (GCA) and specific (SCA) combining ability variances were significant for most studied traits under both irrigation regimes, indicating the importance of additive and non-additive genetic variances in determining the performance of these traits. The best general combiners were Giza 126 for 100-KW and GY/P and Giza 125 for PH, No. K/S. and GY/P under both irrigation regimes. The best F1 cross in SCA effect for 100-KW, No. K/S and GY/P was Giza 126 X Giza 2000 under both irrigation regimes.
Authors and Affiliations
F. F Saad, A. A Abd El-Mohsen, M. A Abd El-Shafi , I. H Al-Soudan
Keywords
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