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May 13, 2018 · Auxin Definition. An auxin is a plant hormone derived from the amino acid tryptophan. An auxin may be one of many molecules, but all auxin molecules are involved in some sort of cellular regulation. Auxin molecules are one of five major types of plant hormone. The other major groups are the gibberellins, cytokinins, ethylene, and abscisic acid.
Aug 10, 2016 · A conservative definition is that auxin is indole acetic acid (abbreviated IAA), a weak organic acid with a structure similar to the amino acid tryptophan. It possesses an indole ring and a carboxylic acid function. A broader definition of auxin(s) would be a class of compounds that impact plant development in the way IAA does.
- Sebastien Paque, Dolf Weijers
- 2016
Auxins are plant hormones that play a central role in controlling plant growth and development across different environmental conditions. Even at low concentrations, auxins can regulate gene expression through specific transcription factors and proteins that are modulated to environmental responses in the signalling cascade.
- G L B Gomes, K C Scortecci
- 2021
The importance of auxin for human sustenance is both vital and readily apparent: auxin is required for plant growth. Anthropogenic manipulation of auxin physiology has assisted plant propagation, and, through the blind pressure of artificial selection, the development of modern crop varieties (Multani et al., 2003; Salamini, 2003).
- Auxin. Auxins are a group of related molecules that are involved in almost every aspect of the plant’s life cycle. Auxins stimulate growth through cell elongation, which is integral to the plant’s responses to environmental changes.
- Cytokinins. Like auxins, cytokinins are a group of related molecules that regulate growth and development. However, the plant’s response to cytokinin is very different from the responses to auxin.
- Gibberellins. Gibberellins, or gibberellic acid (GA), are a group of over 100 molecules that are primary regulators of stem elongation and seed germination.
- Abscisic acid. While GA facilitates seed germination, abscisic acid (ABA) inhibits it. Abscisic acid is a single molecule that regulates germination and the response of a plant to reduced water availability during drought stress.
Apr 17, 2009 · As multicellular organisms, plants, like animals, use endogenous signaling molecules to coordinate their own physiology and development. To compensate for the absence of a cardiovascular system ...
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Phytohormones are chemical compounds present in very low concentrations in plants. They regulate plant development, growth, longevity and reproductive processes. Here, let’s look at the structure and functions of different phytohormones like auxins, gibberellins, cytokinins, ethylene and abscisic acid. Download Complete Chapter Notes of Plant ...
