Developing next generation submergence tolerant rice breeding lines from single cross PSB Rc10 x NSIC Rc194 (IR64-Sub1)
2018
Concepcion, J.S. | Ticman, H.T. | Bagarra, J.C. | Buluran, R.J.D. | Valida, G.D. | Balmeo, K.R.P. | Santiago, N.D. | Ramos, A.V. | Bandonill, E.H. | Desamero, N.V.
With the increasing threat in rice production due to climate change affecting flash flood-prone areas, there is a need to develop new submergence tolerant varieties with high grain yield, biotic stress tolerance, and good grain quality. A total of 160 F sub 1 plants were generated from PSB Rc10 and NSIC Rc194 single cross, wherein 1500 F sub 2 plants were established and subjected to submergence stress evaluation at seedling stage. Subsequent agronomic characterization, line selection, and uniformity evaluation from F sub 3-F sub 6 generations yielded 18 fixed recombinant inbred lines (RILs). Fixed RILs were subjected to comparative field performance under submergence stress at vegetative stage in 2017DS, and evaluated for grain quality and biotic stress resistance. RILs had comparable survival with NSIC Rc194 (98%) and FR13A (99%) ranging from 73% to 100% at 21 days after de-submergence. Yield potential under favorable condition ranged from 4.276 t/ha to 6.409 t/ha averaging to 5.631 t/ha wherein 4 (22%) RILs yielded higher by 12% to 83% compared with parental NSIC Rc194 (2.709 t/ha. A total of 17 (94%) RILs yielded higher 12% to 83% compared with parental NSIC Rc194 (2.709 t/ha). Seven (39%) RILs were identified to have resistance to Rice Blast, 13 (72%) with intermediate resistance to Bacterial Leaf Blight and 14 (78%) with resistance to Tungro under field condition. All RILs were scored as intermediate resistant to stem borer, brown plant hopper, and green leaf hopper. RILs had low to intermediate gelatinization temperature, wherein nine RILs (50%) had intermediate to low amylose content ranging from 16.9 to 21.2. A total of 8 elite RILs were selected based on survival, yield potential, biotic stress resistance, and grain quality and are possible nominees to National Cooperative Testing for submergence condition.
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