Comparative field performance of recombinant inbred rice lines with pyramided saline-submergence tolerance under flash-flooding condition
2019
Sumabat, R.M.A. | Concepcion, J.S. | Desamero, N.V.
Prevalence of typhoon and sea water intrusion posts a significant effect in rice production especially in coastal rainfed-lowland areas and grain yield under submergence stress and non-lines (RILs) were evaluated for field performance and grain yield under submergence stress and non-stress conditions, established in Randomized Complete Block Design (RCBD) with 2 replicates. Significant genotype by environment (GxE) interaction observed in plant height, flowering, and grain yield. Flowering of breeding lines ranged from 78 to 94 days after sowing (DAS), averaging to 87 DAS, which was significantly delayed by 4 21 days due to submergence stress. Nine RILs (29%) flowered earlier by 1 3 days compared to IR64-Sub1 (97 DAS) under submergence stress. Grain yield of RILs under favourable condition ranged from 5.949 t/ha to 8.338 t/ha averaging to 7.316 t/ha. All RILs yielded higher than IR64-Sub1 (5.785 t/ha), while 13 RILs (42%) yielded higher than IR64 (7.736 t/ha) by 1% - 16% under favourable condition. Under submergence stress, grain yield was reduced by 16% (1.230 t/ha) to as much as 81% (5.671 t/ha). Four RILs (13%) yielded higher by 8% (0.324 t/ha) to 47% (1.982 t/ha) compared to IR64-Sub1 (4.171 t/ha). Survival of RILs ranged from 26% to 81% averaging to 51% at 21 days after de-submergence. Nine RILs (29%) were identified and selected based on grain yield and agronomic performance. Selected lines are potential nominees to National Cooperative Testing for Submergence and Saline-Prone Ecosystems.
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