Abstract
Phytohormones are defined as substances produced in some tissues at certain developmental stages of a plant. They occupy a central position in the regulation of growth, and especially of differentiation of plants in general, as well as in cell and tissue culture systems. On the basis of such reactions, phytohormones are usually divided into five groups, i.e., auxins, gibberellins, cytokinins, some gaseous compounds like ethylene, and a group associated predominantly with growth retardation and senescence, such as abscisic acid (ABA), and based on more recent data, Jasmonic acid and Brassinosteroids, and also salicylic acid. The significance of growth regulators applied with the nutrient medium has been dealt here. Endogenous hormonal system of carrot cell cultures in the NL medium have been determined. Twenty-four hours after application of 14C-labeled IAA (side chain labeled), the isotope could be detected in several fractions of the tissue, as well as in the nutrient solution. Interaction of IAA and ethylene is discussed. Finally, some remarks on hormone autotrophic cultures have been made.
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Neumann, KH., Kumar, A., Imani, J. (2020). Phytohormones and Growth Regulators. In: Plant Cell and Tissue Culture – A Tool in Biotechnology. Springer, Cham. https://doi.org/10.1007/978-3-030-49098-0_11
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DOI: https://doi.org/10.1007/978-3-030-49098-0_11
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