GENETICAL ANALYSIS AND DETECTION FOR WIDE COMPATIBILITY TRAITS OF SOME RICE GENOTYPES UNDER EGYPTIAN CONDITIONS | ||||
| Journal of Sustainable Agricultural Sciences | ||||
| Article 7, Volume 42, Issue 1, March 2016, Page 99-125 PDF (207.16 K) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/jsas.2016.2774 | ||||
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| Abstract | ||||
| The present study was carried out at the Experimental Farm of Sakha Agricultural Research Station, Sakha, Kafr El-Sheikh, Egypt, during 2012 and 2013 rice growing seasons to study the genetical analysis and detection of wide compatibility traits in some lines as well as to extent combining ability, gene action and three types of heterosis i.e. heterosis over better-parent (BP), mid-parent heterosis (MP) and standard heterosis for traits : yield and its components in some lines to improveme and utilize for some lines in hybrid rice production. The experiment comprised twenty two cross progenies derived from two varieties/lines namely; Giza 177 (Japonica) and Giza 182 (Indica) as female parents with 11 lines as pollinated parents (testers) namely; Yabni M55, Giza 178, Improved Sabramati, Yen Geng 135, TNAU 6464, TNAU 831358, TNAU 831399, IR47686-18-6-1, Millie, 85040-TR 853-4-1 and Pecos, were evaluated in a randomized complete block design (RCBD) with three replications. The results showed that the analysis of variance of combining ability revealed significant differences among parents, crosses and line x tester interaction for all the traits. The ratio of K2 GCA / K2 SCA was more than unity for days to heading, plant height, number of panicles/plant, panicle length, number of spikelets/panicle, pollen fertility percentage, spikelet fertility percentage, number of filled grains/panicle, 1000 – grain weight and grain yield, indicated the preponderance of additive gene effects in the expression of these traits. The rice varieties; Yabni M55, Giza 178, TNAU 831358, IR47686-18-6-1, Millie and Pecos showed highly spikelet fertility (> 70%) when they were crossed with japonica and indica testers, indicated that these lines can be identified as wide compatible genotypes. Moreover, the crosses of Giza 177 X Giza 178 and Giza 177 X Pecos were the best specific combiner for grain yield and 1000–grain weight. The parental lines proved to be utilized in hybrid rice development and production. The F1 hybrid combinations showed highly significant and significant values in three types of heterosis for all traits studied except pollen and spikelet fertility percentage. | ||||
| Keywords | ||||
| F1 rice crosses; Grain yield; Heterosis; genetic parameters; yield components; wide compatibility; Oryza sativa | ||||
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