Auxins Definition - An auxin is a plant hormone that is primarily involved in regulating plant growth. t. 1 1970) : L' auxine est normalement apportée dans l'ovule par le pollen et l'on pense que la pollinisation doit stimuler la production d' auxine par l'ovaire (Muir, 1942). Any opinions in the examples do not represent the opinion of the Cambridge Dictionary editors or of Cambridge … Hormone Definition. Substance jouant le rôle d'hormone de croissance et de développement chez les végétaux (cf. These examples are from the Cambridge English Corpus and from sources on the web. Auxins cause the cells below the shoot apex to expand or elongate, and this (rather than cell division) is what causes the plant to increase in height. They can be produced artificially in laboratories for such …

Synthetic auxins such as 2, 4-D and 2, 4, 5-T have been used as herbicides, broad-leaved weeds like dandelions are much more susceptible to auxins than narrow-leaved plants like grass and cereal crops.

Biol. auxin meaning: 1. a chemical substance that controls growth in plants 2. a chemical substance that controls growth…. Auxins inhibit the growth of lateral buds so that the plant grows upwards more than outwards.

In woody plants, auxins also stimulate cell division in the cambium, which produces vascular tissue. Learn more. A hormone is a biological compound used by multicellular organisms to organize, coordinate, and control the functions of their cells and tissues. Méd. Auxin definition is - any of various usually acidic organic substances that promote cell elongation in plant shoots and usually regulate other growth processes (such as root initiation): such as. Commercially, auxins are used to promote root growth, to promote uniform flowering, and to set fruit and prevent premature fruit drop. ‘Hormones such as auxins and gibberellins trigger fruit cells to expand.’ ‘New links to the plant hormone, auxin, were also uncovered.’ ‘Moreover, lateral root formation can be initiated by the application of the plant hormone auxin.’ These chemicals can control everything from metabolism to behavior, and are necessary for organisms to survive and reproduce.

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