Polarité dans la fronde de Schottera nicaeensis (Phyllophoracées)

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Abstract
Regenerating segments of the frond of Schottera nicaeensis show polarity in the origin and development of the adventitious shoots. Two types of shoots are produced by the opposite poles. Distal shoots, destined to grow into blades, appear before the proximal ones, which grow in a cylindrical shape. No shoots appear in the proximal pole if the shoots from the distal pole are cut off. If the shoots from the distal pole are cut off after the appearance of adventitious primordia on the proximal pole, the latter grow into blades whilst the shoots which grow out afterwards from the distal pole develop in a cylindrical shape. Therefore an inversion of morphological polarity was observed. These results indicate that, although shoots from both surfaces are potentially the same, the presence of flattened shoots in one pole influences the outgrowth and development of those growing on the opposite pole.

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