Definition

1. Noun:
   • A plant hormone that regulates growth: Auxin is a class of plant hormones primarily involved in coordinating growth and developmental processes, such as cell elongation, root formation, and bud development.

Usage Examples

• Noun:
  • The application of auxin to the stem cuttings stimulated root growth.
  • Auxin is responsible for the phenomenon of phototropism, where plants grow toward light.
  • Scientists study how auxin distribution affects plant shape.

Advanced Usage

• "Auxin transport": Refers to the directional movement of auxin within plant tissues, which is crucial for establishing growth patterns.
  • Polar auxin transport is a key mechanism in plant development.
• "Auxin response": Describes the cellular and genetic changes that occur when auxin binds to its receptors.
  • The study focused on the auxin response factors that control gene expression.

Variants and Related Words

• Auxinic (adj): Pertaining to or having the properties of an auxin.
  • The compound showed auxinic activity in the bioassay.
• Indole-3-acetic acid (IAA) (n): The most common and well-studied natural auxin in plants.
  • IAA is the primary endogenous auxin in most plant species.

Synonyms

• Plant growth regulator: A broader term for natural or synthetic substances that affect plant growth processes.
• Phytohormone: Another general term for a plant hormone.

Related Phrases

(Note: 'Auxin' is a technical noun and does not form phrasal verbs or idioms in common usage. The phrases below are common collocations in botanical science.) - Auxin signaling: The pathway by which auxin exerts its effects inside plant cells. - Understanding auxin signaling is fundamental to plant biology. - Auxin gradient: A difference in auxin concentration across a tissue, which directs growth. - The auxin gradient determines where new leaves will form.

Noun

1. a plant hormone that promotes root formation and bud growth