Title: Cambium Formation in Wounded Solanaceous Stems
Abstract: When stems of certain Solanaceous species are wounded the internal phloem strands that lie near to the damaged surface become enlarged through cell division, and some of them develop a vascular cambium. This ‘internal cambium’ forms phloem inwards and xylem outwards; it is thus in inverted orientation. Such a structure does not occur in the normal stem of any Solanaceous plant. Further, during the regeneration of a cambial cylinder after wounding, the regenerating cambium may turn inward to meet wounded internal phloem strands. Where this happens, subsequent secondary thickening leads to the formation of thin tubes of cambium running radially through the xylem and forming a limited amount of enclosed phloem which connects the internal and external phloem systems of the stem. The jpositions in which these cambia arise are explicable by the ‘gradient induction’ hypothesis of cambial regeneration, but not by the ‘free surfacfe’ and ‘cambial ring’ theories.
Publication Year: 1961
Publication Date: 1961-04-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 9
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