Identification and selection of potential restorer lines for three-line hybrid development
2019
Meman, M.A.C. | Santiago, J. | Ablaza, M.S.F. | Rillon, J.P. | Bandonill, E.H. | Caguiat, J.D. | Gramaje, L.V. | Desamero, N.V. | Waing, F.B.
Development of restorer lines with good restoring ability coupled with other good agronomic factors have been one of the challenges for three-line system. This study aimed to evaluate performance of advanced breeding lines based on morpho-agronomic traits, grain quality and pest and disease resistance. Field performance, grain quality and reaction to major insect pest and diseases of 93 advanced breeding lines were evaluated. Based on marker genotyping, 65% of the lines have presence of at least one Rf gene (Rf3 and Rf4). Spikelet fertility ranged from 57.16 to 95.19%. Predicted grain yield based on BLUPs ranged from 5.51 to 7.23 t/ha with an average of 6.29 t/ha in DS, and 3.28 to 4.66 t/ha with an average of 3.90 t/ha in WS, as compared to the grain yield of the best performing checks NSIC Rc 402 with 7.02 t/ha in DS and NSIC Rc222 with 4.13 t/ha in WS. For the grain quality traits, the brown rice (%) ranged from 73.58 (poor) to 79.64 (fair), total milled rice (%) with 63.83 (Grade 2) to 72.26 (Premium) recovery, head rice (%) of 38.72 (Grade 3) to 64.98 (Premium), percent chalkiness of 2.05 (Premium) to 77.26 (aa), amylose content (AC) ranged from 13.57 (Low) to 26.22 (High) and gelatinization temperature ranged from 2.0 (High intermediate) to 7.0 (Low). In terms of disease resistance, majority of the lines have intermediate to resistant reaction to leaf blast, intermediate reaction to BLB (PXO79 race 3) and sheath blight. Finally, identified potential restorer lines will be nominated as pollen parent lines to the hybrid source nursery for the development of testcrosses.
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