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He isolated and determined the structure of auxin, the first known plant hormone. He spent most of his early career (1935–1965) at Harvard University, and his later career (1965 - 1989) at the University of California, Santa Cruz. [1] He is credited with identifying indole-3-acetic acid as an auxin. [2] Thimann was born in Ashford, England.
The most important member of the auxin family is indole-3-acetic acid (IAA), [7] which generates the majority of auxin effects in intact plants, and is the most potent native auxin. And as native auxin, its equilibrium is controlled in many ways in plants, from synthesis, through possible conjugation to degradation of its molecules, always ...
Plant hormones (or phytohormones) are signal molecules, produced within plants, that occur in extremely low concentrations. Plant hormones control all aspects of plant growth and development, including embryogenesis , [ 1 ] the regulation of organ size, pathogen defense, [ 2 ] [ 3 ] stress tolerance [ 4 ] [ 5 ] and reproductive development. [ 6 ]
Phytohormones, particularly jasmonic acid (JA), ethylene, and auxin, are central regulators of the long-term developmental changes underpinning thigmomorphogenesis. Among these, JA is a primary mediator, modulating gene expression and enhancing stress tolerance in response to mechanical stimuli.
Indole-3-acetic acid (IAA, 3-IAA) is the most common naturally occurring plant hormone of the auxin class. It is the best known of the auxins, and has been the subject of extensive studies by plant physiologists. [1] IAA is a derivative of indole, containing a carboxymethyl substituent. It is a colorless solid that is soluble in polar organic ...
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Indole-3-butyric acid (1H-indole-3-butanoic acid, IBA) is a white to light-yellow crystalline solid, with the molecular formula C 12 H 13 NO 2. It melts at 125°C in atmospheric pressure and decomposes before boiling. IBA is a plant hormone in the auxin family and is an ingredient in many commercial horticultural plant rooting products.