Von Knospen und Blüten – Teil I
Ist die vegetative Knospe die strukturelle Grundlage der Blüte?
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Abstract:
The first part of this work deals with the fundamental concepts and methods of morphology: with the classical basic organ concept and with the type concept of the leaf; alternative concepts are proposed. The importance of the shoot bud for understanding the structure of angiosperms has received little attention to date. Augustin de Candolle and Agnes Arber compared the shoot bud with the flower and regarded it as the basis of the flower. Few authors have commented on the relationship between the scale leaf and the foliage leaf. The work of Adriance S. Foster, Agnes Arber and Michel Guédès suggests that scale leaves and foliage leaves are equivalent organs, both of which can be understood as subtypes (organ classes) of the superordinate archetype «leaf», as are the flower organs. Their view is supported by Wolfgang Hagemann’s work on the organogenesis of the angiosperm leaf. This contradicts the widely accepted view of Thomas Goebel and Wilhelm Troll, who regard the scale leaf as a reduced leaf. The historical section shows how alternatives have been considered or developed by Goethe, de Candolle, Sachs, Foster, Arber, Guédès and Hagemann.
Keywords: flower bud, shoot bud, scale leaf, foliage leaf, homology, type, ontogenesis
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