Identification and Evaluation of Some New Hybrids of Rice Under Egyptian Conditions | ||||
| Journal of Agricultural Chemistry and Biotechnology | ||||
| Article 1, Volume 7, Issue 5, May 2016, Page 121-133 PDF (564.26 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jacb.2016.40795 | ||||
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| Author | ||||
| M. Awad-Allah | ||||
| Rice Res. Dept. Field Crops Res. Inst., ARC, Egypt. | ||||
| Abstract | ||||
| The present study was carried out at the Experimental Farm of Sakha Agricultural Research Station, Sakha, Kafr El-Sheikh, Egypt, during 2013 and 2014 rice growing seasons to identify the restoring ability and evaluation of some new rice hybrids, as well as extent combining ability, gene action and three types of heterosis for the yield and its components. The experiment comprised 22 cross progenies derived from two cytoplasmic male sterile lines namely; G46A and IR69625A as female parents with 11 lines as pollinated parents (testers) Giza178, Giza179, GZ5121, Millie, IR25571-31, TNAU6464, TNAU831358, TNAU831399, MTU-1010, IR62164-32-2-2-2-1 and CT6510-24-1-2, were evaluated in a Randomized Complete Block Design (RCBD) with three replications. The results showed that the analysis of variance for combining ability revealed significant and highly significant differences among parents, crosses and Line x Tester interaction for all the studied traits. The ratio of K2 GCA / K2 SCA was more than unity for all studied traits, indicated the preponderance of additive gene effects in the expression of these traits. The rice hybrids; G46A X TNAU831399, IR69625A X Giza178, IR69625A X Millie, G46A X Giza178 and IR69625A X TNAU831358 were the best specific combiner for grain yield and G46A X CT6510-24-1-2, IR69625A X TNAU831358, G46A X Millie and IR69625A X Giza179 for 1000–grain weight. Concerning grain yield, the eight rice hybrids showed values for standard heterosis more than 15% over the check variety. These hybrids were; IR69625A X Millie (47.1%), G46A X MTU-1010 (36.7%), G46A X Giza179 (30%), G46A X CT6510-24-1-2 (28.3%), IR69625A X CT6510-24-1-2 (22.8%), G46A X IR62164-32-2-2-2-1 (22.4%), G46A X Giza178 (22%), G46A X IR25571-31 (19.7%), IR69625A X MTU-1010 (19.2%) and IR69625A X IR62164-32-2-2-2-1 (16%) and could be utilized to develop hybrid rice varieties. | ||||
| Keywords | ||||
| Hybrid Rice; Grain yield; Heterosis; pollen and spikelet fertility; yield components; Oryza sativa L | ||||
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