physical and Physicochemical Properties for Selected Hybrid Rice Combinations Derived from Three Line System

Ten hybrid rice genotypes were evaluated during 2015 and 2016 rice growing seasons at the Experimental Farm of the Rice Research and Training Center (RRTC), Sakha, Kafrelshiekh, Egypt. The experiments were assessed to study Physical and physicochemical properties of rice hybrids grain and heritability with genetic advance which is more helpful in predicting the quality under selection than heritability estimates alone. Combined analysis was performed for data over the two years. Most of studied characters were significantly greater in 2015 than in 2016 season except the duration, grain yield and appearance quality of rice. Highly significant differences were observed among the genotypes for all studied traits. G46A/WTR1 genotype followed by G46A/LH1 produced the highest grain yield. All the hybrid combinations have medium grain shape (< 3.0 ratio) except for G46A/IR04A132 (slender > 3.0 ratio). The hybrid IR69625A/WAB6-125 recorded higher milling yield (70.5%). The hybrid G46A/IR43 showed less broken rice (6.8 %) followed by G46A/HHZ5-Y3-Y1-DT1 (8.1%). All hybrid combinations were intermediate for gelatinization temperature except for IR69625A/CT19021-3-4 was high. Amylose content % of all genotypes ranged from 21.6 to 25.7%. The interaction between genotypes and years had a non-significant effect except for 1000-grain weight and head rice recovery. The estimates of heritability were high for all traits except for gelatinization temperature and ranged from 71.05% to 99.95%. The presence of high heritability values indicates the effectiveness of selection on the basis of phenotypic performance. Grain L/W ratio (95.52% and 26.57%), head rice recovery (99.84% and 21.03%) and elongation ratio (71.05% and 34.09%) recorded high heritability and high genetic advance, respectively. Significant positive phenotypic correlation was found between grain yield and days to maturing (0.635), number of panicles per plant (0.655) and grain width (0.712). The trait grain length showed highly significant and positive correlation with grain L/W ratio (r = 0.927) and significant negative with grain width (r = -0.700). The trait brown rice recovery showed significant and positive correlation with milled rice recovery (r = 0.760) and amylose content (r = 0.730).