Crossword clues for auxin
The Collaborative International Dictionary
auxin \aux"in\ n. 1. a substance which, in small concentrations, promotes root formation, bud growth, or certain other processes such as fruit ripening or leaf drop in plants.
Douglas Harper's Etymology Dictionary
plant growth hormone, 1934, from German (1931), from Greek auxein "to increase" (see augment) + chemical suffix -in (2).
Wiktionary
n. (context botany English) A class of plant growth substance (often called phytohormones or plant hormones) which play an essential role in coordination of many growth and behavioral processes in the plant life cycle.
WordNet
n. a plant hormone that promotes root formation and bud growth
Wikipedia
Auxins (plural of auxin ) are a class of plant hormones (or plant growth substances) with some morphogen-like characteristics. Auxins have a cardinal role in coordination of many growth and behavioral processes in the plant's life cycle and are essential for plant body development. Auxins and their role in plant growth were first described by the Dutch scientist Frits Warmolt Went. Kenneth V. Thimann isolated this phytohormone and determined its chemical structure as indole-3-acetic acid (IAA). Went and Thimann co-authored a book on plant hormones, Phytohormones, in 1937.
Usage examples of "auxin".
In the same way, auxins will concentrate on the lower side of a stem held horizontally, curving the tip upward.
One of the most powerful of the auxins was discovered through studies of a plant disease.
Geotropism seems also to be mediated by auxins, but how the distribution of auxins can be affected by gravity is not yet understood.
The best-known of these auxins is a compound called indolyl-^-acetic acid, commonly abbreviated 7AA.
Many of the movements of plants are governed by the distribution of these auxins.
One of the most powerful of the auxins was discovered through studies of a plant disease.
Many synthetic compounds have been shown to have auxin activity and are commercially available, such as napthaleneacetic acid (NAA), indolebutyric acid (IBA), and 2,4-dichlorophenoxyacetic acid (2,4 DPA), but only indoleacetic acid has been isolated from plants.
Natural plant growth substances such as auxins, cytokinins, and gibberellins are certainly responsible for the control of root initiation and the rate of root for- mation.
Starch levels drop, strengthening tissues and fibers begin to soften, cell wall thickness decreases, vascular tissue is diminished, auxin levels rise, and undifferentiated tissue begins to form.