Genetic Tumors: Physiological Aspects of Tumor Formation in Interspecies Hybrids
1982; Elsevier BV; Linguagem: Inglês
10.1016/b978-0-12-394380-4.50008-6
Autores Tópico(s)Plant Molecular Biology Research
ResumoThis chapter discusses the physiological aspects of tumor formation in interspecies hybrids. An interspecific incompatibility in some crosses of Bryophyllum and of Gossypium leads to tumorous growth of hybrid shoots. Neoplasia can affect practically all plant organs besides the roots and shoots. Genetic studies on these plants have shown that tumor expression is controlled in inheritance by a single dominant gene (Frs) from L. chilense, which is often deficient in transmission. Tissue culture studies have shown that genetically tumorous and nontumorous segregants of tomato can be distinguished by their growth patterns in various culture media supplemented with nutrients and phytohormones. Tumor formation in these hybrids usually occurs at a mature stage in plant development but can be accelerated or repressed by chemical treatment. The physiological and biochemical processes underlying tumorigenesis are reflected in the persistent activation of normally repressed biosynthetic systems. The enhanced activity of growth factors, enzymes, and cell metabolites in tumorous plants and tissues provides evidence for an increased biosynthetic capacity in neoplastic cells.
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