auxin

American  

[awk-sin] / ˈɔk sɪn /

noun

Biochemistry.

1. a class of substances that in minute amounts regulate or modify the growth of plants, especially root formation, bud growth, and fruit and leaf drop.

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auxin British  

/ ˈɔːksɪn /

noun

1. any of various plant hormones, such as indoleacetic acid, that promote growth and control fruit and flower development. Synthetic auxins are widely used in agriculture and horticulture

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auxin Scientific  

/ ôk′sĭn /

1. Any of various hormones or similar substances that promote and regulate the growth and development of plants. Auxins are produced in the meristem of shoot tips and move down the plant, causing various effects. 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. In woody plants, auxins also stimulate cell division in the cambium, which produces vascular tissue. Auxins inhibit the growth of lateral buds so that the plant grows upwards more than outwards. They can be produced artificially in laboratories for such purposes as speeding plant growth and regulating how fast fruit will ripen.

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Other Word Forms

Derived Forms

• auxinic
  adjective

Etymology

Origin of auxin

First recorded in 1930–35; aux- + -in ²

Example Sentences

Auxin is a fuel for a kind of heartbeat that beats in each and every root tip of a plant.

From Science Daily • May 15, 2024

Mamun Rashid, the chief executive of Auxin Solar, said in a statement that the findings “largely validated and confirmed Auxin’s allegations of Chinese cheating.”

From New York Times • Dec. 2, 2022

The decision, released in Commerce Department documents, follows an eight month investigation that was requested by a U.S. solar panel maker, Auxin Solar.

From Reuters • Dec. 2, 2022

Auxin concentrations are higher near the root tip and decrease with distance from the tip.

From Textbooks • Jun. 9, 2022

Auxin: No success has been attained with indole-butyric acid crystals in a talc-based powder or with untreated cuttings.

From Northern Nut Growers Association Report of the Proceedings at the 44th Annual Meeting Rochester, N.Y. August 31 and September 1, 1953 by Northern Nut Growers Association