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The effect of the 6-week flooding treatment on root development of pedunculate oak that started at the phenophase budswell. (A) A control tree with many maturing roots. (B) The root system of a tree that was flooded to a stem height of 50 cm; elongating or maturing roots are absent. (C) The root system of a tree of which only the roots were flooded; elongating or maturing white roots are absent but many hypertrophied lenticels have developed just below the water surface.
