Agronomic performance of a four-parent recombinant inbred rice population under aerobic condition
2015
Carampatana, J.E. | Patricio, K.T. | Pocsedio, A.E. | Millas, R.A. | Tapic, R.A. | Tabanao, D.A.
At about 1.5 t/ha as of 2012, the yield of rice cultivation in the upland environment can be increased through development of new higher-yielding genotypes. This study was conducted to determine the agronomic performance under aerobic conditions of double-cross derived recombinant inbred lines relative to performance of their parents, and identify superior genotype selections primarily based on grain yield. A recombinant inbred population composed of 204 lines at the F6 generation was evaluated against three parents for yield and yield components, in complete blocks using alpha-lattice design with two replications. For all parameters, data frequency distribution curves were almost symmetrical with very slight skewing, and highly significant differences were observed among genotype means. Range of values were six to 18 days after sowing (DAS) for 50% emergence, 74 to 100 DAS for partial heading, 105 to 131 DAS for maturity, 68.8 to 126.5 cm for plant height, 99 to 390 panicles per linear meter, 19.3 to 26.3 cm for panicle length, 58 to 132 filled grains per panicle, 17.1 to 26.1 g for 1000 grain weight and 1.1 to 5.6 t/ha for grain yield. Among all yield component parameters, only number of panicles per linear meter showed relatively high correlation with grain yield (r square=0.32). Top 40 RILS were identified with significantly higher grain yield than the three parents (ALPHA=0.05) ranging from 3.0 (A014-134) to 5.6 (A014-113). From among the top 10% selection, an entry was nominated to the National Cooperative Tests of rice for the upland environment, and 27 were used as hybrid.
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