auxin etymology

Etymology:

  • The term "auxin" is derived from the Greek word "auxein," meaning "to grow" or "to increase."

Meaning:

Auxins are a class of phytohormones (plant hormones) that primarily regulate plant growth and development. They play crucial roles in various cellular processes, including cell elongation, root growth, apical dominance, and fruit development.

Origin:

The discovery of auxins can be traced back to the early 20th century:

  • 1909: Francis Darwin and Gordon Haycock conducted experiments involving grass seedlings, where they observed that the presence of light caused the stems to bend towards the light source.
  • 1918: Peter Boysen-Jensen repeated Darwin and Haycock's experiments and used a mica plate to block the transmission of an unknown substance from the tip of the stem to the rest of the plant. He found that the stems no longer exhibited the bending response.
  • 1926: Frits Went named the unknown substance "auxin." He isolated it from oat seedlings and demonstrated its ability to promote root growth.
  • 1934: Kenneth Thimann and Frederick Skoog identified indole-3-acetic acid (IAA) as the primary auxin responsible for growth promotion in plants.

Since then, extensive research has been conducted on auxins, leading to a better understanding of their structure, function, and role in plant physiology.

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