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Evidence for yellow light suppression of lettuce growthResearchers studying plant growth under different lamp types often attribute differences in growth to a blue light response. Lettuce plants were grown in six blue light treatments comprising five blue light fractions (0, 2, 6% from high-pressure sodium [HPS] lamps and 6, 12, 26% from metal halide [MH] lamps). Lettuce chlorophyll concentration, dry mass, leaf area and specific leaf area under the HPS and MH 6% blue were significantly different, suggesting wavelengths other than blue and red affected plant growth. Results were reproducible in two replicate studies at each of two photosynthetic photon fluxes, 200 and 500 mumol m-2 s-1. We graphed the data against absolute blue light, phytochrome photoequilibrium, phototropic blue, UV, red:far red, blue:red, blue: far red and 'yellow' light fraction. Only the 'yellow' wavelength range (580-600 nm) explained the differences between the two lamp types.
Document ID
20040112509
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Dougher, T. A.
(Utah State University 4820 Old Main Hill, Logan, UT 84322-4820, United States)
Bugbee, B.
Date Acquired
August 21, 2013
Publication Date
February 1, 2001
Publication Information
Publication: Photochemistry and photobiology
Volume: 73
Issue: 2
ISSN: 0031-8655
Subject Category
Life Sciences (General)
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Discipline Life Support Systems

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