The root ultrastructure of seedlings grown in anaerobic conditions was investigated in four neotropical species: Sesbania virgata, Erythrina speciosa, Sebastiania commersoniana (all present in waterlogged or flooded areas), and Schizolobium parahyba (that occupies mainly dry areas). Anaerobiosis
Some of the parameters that determine flooding resistance-and consequently habitat zonation-were investigated in four neotropical trees (Schizolobium parahyba, Sebastiania commersoniana, Erythrina speciosa and Sesbania virgata). The constitutive parameters of seeds (size, nature and amount of
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