Internode elongation pattern of Rayada variety, Kaladigha to typical deepwater rice and comparative phenotypes of Rayada after inundation. (a) internode elongation pattern Rayada and typical deepwater rice (Habigonj amam I-VIII after Hasanuzzaman (1974) (bar = SD), (b) number of internodes per plants, (c) phenotypic comparison of basal internodes (above soil) in Rayada in control and inundated condition (bar = 5 cm), (d) comparative phenotypes BRRI52, Kaladigha, and inundated Kaladigha (left to right, respectively) at plants maturity. Plants (4.5 months old) were grown in water tube with increasing water level keeping top leaves above water for 45 days reaching 2.5 meter. Then the plants were kept under around 2.5 meter inundation (water renewal fortnightly) for rest of months (around 7 months) till seed mature. Basal internodes/nodes (3–4) beneath the soil were excluded in estimation and comparison.