Development and Characterization of New Integrated Lines for Use in Two-Way Inbred and Hybrid Rice
[1]
Galal Bakr Anis, Rice Research Section, Field Crops Research Institute, Agriculture Research Center, Kafr Elsheikh, Egypt.
[2]
Hamada Mohamed Hassan, Rice Research Section, Field Crops Research Institute, Agriculture Research Center, Kafr Elsheikh, Egypt.
[3]
Tahany Mohamed Mazal, Rice Research Section, Field Crops Research Institute, Agriculture Research Center, Kafr Elsheikh, Egypt.
[4]
Walid Hassan Elgamal, Rice Research Section, Field Crops Research Institute, Agriculture Research Center, Kafr Elsheikh, Egypt.
Rice is one of the most important cereal crops and serves as the primary source of staple food for more than half of the global population. The main objectives of this study were to evaluate and compare 18 new promising lines with the check commercial variety Giza 178 and to identify which of these lines exhibits high yielding and can be used for hybrid rice breeding. Field experiments were conducted at Rice Research and Training Center, Sakha, Kafr Elsheikh, Egypt during five rice-growing seasons from 2012 to 2016. This study conceptualized to find out the best and adapted lines that can be exploited in inbred and hybrid program. Based on the findings of the study, the two promising lines; GZ9399-4-1-1-2-1-2 and GZ9399-4-1-1-3-2-2 among those lines had significant effects on most of studied traits in multi-locations trails during studying seasons. On an average, GZ 9399-4-1-1-3-2-2 showed the highest mean value (4.8 and 2.0 tons/fed.) under normal and salinity conditions for grain yield, respectively, while, the check variety Giza 178 gave the lowest yield values (4.6 and 1.5 tons/fed.) under both conditions. The yield reduction for the three genotypes with values 59.5% (GZ9399-4-1-1-2-1-2), 58.3% (GZ9399-4-1-1-3-2-2) and 67.4% (Giza 178) as a result of the effect of salinity. A high degree of variation was observed for all studied traits. The phenotypic coefficient of variation (PCV) was greater than genotypic coefficient of variation (GCV) in all included traits. High heritability coupled with high genetic advance as percent of mean was observed for plant height, filled grains panicle-1, panicle weight and sterility % indicating that the traits were controlled by additive gene action. The two promising lines identified as restorers for two CMS lines; IR69625A and Gang46A. Tester GZ9399-4-1-1-2-1-2 behaved as an effective and good restorer for CMS lines IR69625A and Gang46A with pollen and spikelet fertility values 95.0%, 91.1% and 96.0%, 93.4%, respectively. These indicating that we can use these two lines in inbred and hybrid rice breeding programmes.
Oryza Sativa, High Yield, Genetic Components, Inbred, Hybrid Rice
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