Despite its long history, the mechanism by which auxin inhibits the growth of … For example, if auxin transport inhibitors such as 2,3,5-triiodobenzoic acid (TIBA) are applied to stems, the suppression of outgrowth is abolished (Snyder, 1949; Panigrahi and Audus, 1966). Cytokinins counter the apical dominance induced by auxins; they in conjunction with ethylene promote abscission of leaves, flower parts, and fruits.
Origin of plant auxin biosynthesis Jipei Yue1,2, Xiangyang Hu1, and Jinling Huang2 1Key Laboratory for Plant Diversity and Biogeography ofEast Asia, Kunming Institute Botany, Chinese Academy Sciences, Kunming, 2 China Department of Biology, East Carolina University, Greenville, NC 27858, USA The recent finding of the tryptophan aminotransferase (TAA)/flavin monooxygenase (YUC) pathway as … Auxins are produced at the growing points of stems and roots, and promote growth by increasing the rate of cell elongation rather than that of cell division. Typically, low concentrations of auxin promote growth whereas high concentrations inhibit it. Planta 212:343–347. Biology Assignment Help, Auxins, Auxins The history of discovery of auxin is a fascinating chapter in plant physiology. Modelling of auxin-binding protein 1 suggests that its C-terminus and auxin could compete for a binding site that incorporates a metal ion and tryptophan residue 44. However, the major mechanism of conversion from tryptophan to IAA remained elusive until relatively recently.
auxin A hormone that promotes longitudinal growth in the cells of higher plants. The hormone auxin was discovered first, through some elegant experiments by Charles Darwin and his son Francis around 1880. Planta 212:343–347. They found that if a coleoptile of
Auxin was hypothesized to be derived from tryptophan as early as the 1930s (reviewed by Went and Thimann, 1937). Cytokinins and auxins often work together, and the ratios of these two groups of plant hormones affect most major growth periods during a plant's lifetime.
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