Skip to main content
ARS Home » Office of Communications » Images » Photos » Apr10 » k4197-7

Download a high-resolution (300dpi) digital image here

Image Number K4197-7

Photoperiodism (discovered in 1918) shows that flowering in plants is controlled by changes in day length. In the 1950s, BARC scientists discover phytochrome, a dual-form plant protein that determines when a plant will start, or put off, flowering. This serves as a core concept in plant physiology in labs all around the country today.


Photo by Scott Bauer.

640 pixels wide: (k4197-7.jpg)

Please visit our Image Gallery