NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
Importance of 'blue' photon levels for lettuce seedlings grown under red-light-emitting diodesLight-emitting diodes (LEDs) with high-intensity output are being studied as a photosynthetic light source for plants. High-output LEDs have peak emission at approximately 660 nm concentrated in a waveband of +/- 30 nm. Lettuce (Lactuca sativa Grand Rapids') seedlings developed extended hypocotyls and elongated cotyledons when grown under these LEDs as a sole source of irradiance. This extension and elongation was prevented when the red LED radiation was supplemented with more than 15 micromoles m-2 s-1 of 400- to 500-nm photons from blue fluorescent lamps. Blue radiation effects were independent of the photon level of the red radiation.
Document ID
20040090389
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hoenecke, M. E.
(University of Wisconsin Madison 53706)
Bula, R. J.
Tibbitts, T. W.
Date Acquired
August 21, 2013
Publication Date
May 1, 1992
Publication Information
Publication: HortScience : a publication of the American Society for Horticultural Science
Volume: 27
Issue: 5
ISSN: 0018-5345
Subject Category
Man/System Technology And Life Support
Distribution Limits
Public
Copyright
Other
Keywords
NASA Program CELSS
NASA Discipline Life Support Systems
Non-NASA Center
NASA Discipline Number 61-10

Available Downloads

There are no available downloads for this record.
No Preview Available