Phenotypic variability of wildrice (Oryza rufipogon Griff.) under drought stress
2019
Valleser, J.L. | Jamago, J.M.
Utilization of crop wild relatives is imperative in improving crop tolerance against Abiotic stresses. Phenotypic variability of O. rufipogon clones from Lakes Apo and Napalit, Bukidnon [Philippines] were assessed under different timing of drought stress imposition. This study was arranged in a 2X4 factorial experiment in RBCD with three replications. Only leaf area was influenced by the interaction of clones and timing of stress imposition after stress termination. Both clones subjected to drought stress at 6 weeks after transplanting (WAT) had comparable means with the well watered seedlings. Whereas, younger seedlings (2WAT) of both clones had smaller leaves. Nonetheless, Lake Napalit cloe (LNC) had recovered its leaf size faster than Lake Apo clone (LAC) after a week of recovery period. Regardless of drought stress imposition, LNC had higher shoot elongation and larger leaves than LAC. Further, variable responses of O. rufipogon clones under different timing of drought stress were notable. Drought impedes root and shoot growth at 2WAT but not at 4WAT and 6WAT. Tiller production was hindered at 2WAT and 4WAT of drought stress imposition but not a 6WAT. However, more dead tillers were recorded on seedlings stressed at 6WAT. Leaves of seedlings subjected to drought were fully rolled reducing transpiration rate to conserve water. Lastly, leaf area was strongly associated with tiller number (r=0.70) and leaf rolling (r=0.87) under drought stress.
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