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Relative growth rate (RGR) (g g–1 d–1) (means ± s.e., n = 17) of dry mass (A) and leaf area ratio (LAR) (B) of Alternanthera philoxeroides plants with and without adventitious roots after 38 d complete submergence in darkness at 25 °C. Asterisk indicates significant differences between the two treatments (P < 0·05, unpaired t-test).
