Cytokinins are derivatives of
WebDec 25, 2024 · It was found that cytokinins are the result of the degradation of nucleic acids and therefore, could serve as an indicator of the rate of … WebCytokinins are adenine derivatives that carry an isoprene-derived or an aromatic side chain at the N6 position of the purine ( Fig. 3.1). In the 1950s, Folke Skoog and colleagues isolated the first cytokinesis-promoting factor, kinetin, from autoclaved herring sperm DNA (Miller et al., 1955a, 1955b ).
Cytokinins are derivatives of
Did you know?
WebCytokinins are adenine derivatives with an isoprenoid side chain and play an essential role in plant development. Plant isopentenyltransferases that catalyze the first and rate … Web摘要： The activity of cell-free preparations of dopamine-beta-hydroxylase from a mammalian source was inhibited by a number of N6-substituted adenine derivatives that are hormonally active as cytokinins in plant systems.
WebThese studies demonstrated that natural plant cytokinins are adenines which have substituted at the N 6 terminal either an isoprene-derived side chain (isoprenoid cytokinins), or an aromatic derivative side chain (aromatic cytokinins). Keywords Purine Nucleoside Phosphorylase Cytokinin Oxidase Cytokinin Biosynthesis
WebJun 1, 2024 · Cytokinins play two roles in this process: (1) promoting the growth of meristems to provide a source of stem cells as a prerequisite for leaf initiation and (2) affecting the establishment of the ... WebSince iso-pentenyl derivatives had little activity they may be very difficult to detect using the soybean callus bioassay. The effect of 28 natural and synthetic cytokinins, including …
WebFeb 14, 2011 · The 2-methylthio derivatives of cytokinins are often found in tRNA, where they are synthesized by the miaB gene (for a review, see Persson et al., 1994). The product of the gene, MiaB, is a bifunctional protein involved in both thiolation and methylation of isopentenyladenine in tRNA (Pierrel et al., 2004).
WebThey are derivatives of indole (auxins), terpenes (Gibberellins), adenine (Cytokinins), carotenoids (Abscisic acid), and gases (Ethylene). These hormones are produced in almost all parts of the plant and are transmitted to various parts of the plant. Hormones play an important role in the processes like vernalization, phototropism, seed ... imco membersWebTo determine the structure-activity relationships of natural aromatic cytokinins, the activity of 6-benzylaminopurine (BAP) and its hydroxylated derivatives was compared in three bioassays based on stimulation of tobacco callus growth, retention of chlorophyll in excised wheat leaves, and dark induction of betacyanin synthesis in Amaranthus … imcom form 4bWebCytokinins are plant hormones, derivatives of adenine with a side chain at the N6‑position. They are involved in many physiological processes. While the metabolism of trans‑zeatin and isopentenyladenine, which are considered to be highly active cytokinins, has been extensively studied, there are others with less obvious functions, such as ... list of kobe 9 shoesWebCytokinins are N6-substituted adenines and represent an important group of phytohormones with diverse biochemical functions in plants, stimulating cell division and plant growth. The main structural feature of cytokinin nucleosides is the presence of a hydrophobic hydrocarbon moiety at the N6-position of adenosine. list of known galaxies in universeWebFeb 27, 2024 · Naturally occurring cytokinins are adenine derivatives with isoprenoid side chains attached to the N 6 position of the adenine ring. Almost all organisms make cytokinins; for example, isopentenyl adenine derivatives are found adjacent to the anticodon loop of a subset of tRNAs in most eukaryotes and bacteria (Persson et al., … list of known planetsWebJul 11, 2024 · Cytokinins constitutes a vital group of plant hormones regulating several developmental processes, including growth and cell division, and have a strong influence on grain yield. Chemically, they are … imcom form 1-aWebThe meaning of CYTOKININ is any of various plant growth substances (such as kinetin) that are usually derivatives of adenine. any of various plant growth substances (such as … imcom form 1-b feb 2014