Ultraweak, spontaneous photon emission in seedlings: toxicological and chronobiological applications

Luminescence. 2014 Dec;29(8):963-8. doi: 10.1002/bio.2658. Epub 2014 Mar 28.


The detection of ultraweak light emission in seedlings has been explored in toxicological and chronobiological studies. The main studies in this area are reviewed briefly, including a report on applied tests held in the last 7 years at LaFA--UNICAMP (Brazil). In general, results indicate that a linear relation for total light emission versus germination performance is found if only strong stress situations are considered, when external factors depress a seedling's development, even when considering a sequential series of tests. Light emitted by a single seedling was detected in a compact apparatus, and data are presented here for the first time showing pronounced circadian cycles are evident, with similar time and frequency profiles as those of the local gravimetric tide.

Keywords: biophoton; chronobiology; germination test; toxicology; ultraweak photon emission.

Publication types

  • Historical Article
  • Research Support, Non-U.S. Gov't
  • Review

MeSH terms

  • Chronobiology Discipline / history*
  • Chronobiology Phenomena
  • Germination*
  • History, 20th Century
  • Luminescence
  • Luminescent Measurements
  • Photons*
  • Seedlings / drug effects
  • Seedlings / growth & development
  • Seedlings / physiology*
  • Toxicology / methods