Species-specific differences in synthesis of
flavonoids and phenolic acids were studied under lengthening
periods of enhanced blue light in a greenhouse experiment in Northern Finland in the autumn of 2012.
The aim was to compare red- and blue- weighted light spectra in relation to biosynthesis of the
compounds. The species studied were red leaf lettuce and basil. There were
five treatments for these
inter-lighting LED manipulations using traditional high pressure sodium lamps as background light
sources. Two treatments were exposed for the entire experimental period with (1) red- and (2) blueweighted
light for 48 days. The other three treatments were initiated with red- weighted light, but after
each subsequent 12 day sub-period, one red-weighted treatment was switched to blue, resulting in the
following treatments: 48, 36, 24, 12 and 0 days under enhanced blue light. Flavonoid and phenolic acid
biosynthesis in plants were found to be species dependent. The most abundant compound in red leaf
lettuce was cichoric acid (a dicaffeoyltartaric acid) while rosmaric acid (an ester of caffeic acid and 3,4-
dihydroxyphenyllactic acid) dominated in basil. Other compounds detected also varied between the
species. Red leaf lettuce was much more responsive to supplemental blue light. Based on these results, it
is suggested that both blue and red light may be needed to regulate the accumulation of phenolics in
basil. Some of the compounds detected accumulated continuously as a function of the spent time under
supplemental blue light in red leaf lettuce, but not in basil.
Species-specific differences in synthesis offlavonoids and phenolic acids were studied under lengtheningperiods of enhanced blue light in a greenhouse experiment in Northern Finland in the autumn of 2012.The aim was to compare red- and blue- weighted light spectra in relation to biosynthesis of thecompounds. The species studied were red leaf lettuce and basil. There werefive treatments for theseinter-lighting LED manipulations using traditional high pressure sodium lamps as background lightsources. Two treatments were exposed for the entire experimental period with (1) red- and (2) blueweightedlight for 48 days. The other three treatments were initiated with red- weighted light, but aftereach subsequent 12 day sub-period, one red-weighted treatment was switched to blue, resulting in thefollowing treatments: 48, 36, 24, 12 and 0 days under enhanced blue light. Flavonoid and phenolic acidbiosynthesis in plants were found to be species dependent. The most abundant compound in red leaflettuce was cichoric acid (a dicaffeoyltartaric acid) while rosmaric acid (an ester of caffeic acid and 3,4-dihydroxyphenyllactic acid) dominated in basil. Other compounds detected also varied between thespecies. Red leaf lettuce was much more responsive to supplemental blue light. Based on these results, itis suggested that both blue and red light may be needed to regulate the accumulation of phenolics inbasil. Some of the compounds detected accumulated continuously as a function of the spent time undersupplemental blue light in red leaf lettuce, but not in basil.
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