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Long-term Blue Light Effects on the Histology of Lettuce and Soybean Leaves and StemsBlue light (320 to 496 nm) alters hypocotyl and stem elongation and leaf expansion in short-term, cell-level experiments, but histological effects of blue light in long-term studies of whole plants have not been described. We measured cell size and number in stems of soybean (Glycine max L.) and leaves of soybean and lettuce (Lactuca sativa L.), at two blue light fractions. Short-term studies have shown that cell expansion in stems is rapidly inhibited when etiolated tissue is exposed to blue light. However, under long-term light exposure, an increase in the blue light fraction from less than 0.1% to 26% decreased internode length, specifically by inhibiting soybean cell division in stems. In contrast, an increase in blue light fraction from 6% to 26% reduced soybean leaf area by decreasing cell expansion. Surprisingly, lettuce leaf area increased with increasing blue light fraction (0% to 6%), which was attributed to a 3.1-fold increase in cell expansion and a 1.6-fold increase in cell division.
Document ID
20060026102
Acquisition Source
Johnson Space Center
Document Type
Reprint (Version printed in journal)
Authors
Dougher, Tracy A. O.
(Montana State Univ. Bozeman, MT, United States)
Bugbee, Bruce
(Utah State Univ. Logan, UT, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2004
Publication Information
Publication: Journal of American Soc. Hort. Sci.
Volume: 129
Issue: 4
Subject Category
Life Sciences (General)
Report/Patent Number
Paper-7357
Funding Number(s)
CONTRACT_GRANT: NAG9-1311
Distribution Limits
Public
Copyright
Other

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