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- Author or Editor: Richard M. Klein x
In order to determine whether the concentration of floral petal anthocyanin pigments could be increased, ultraviolet radiations in the UV-A and UV-B wavelength bands were presented to a variety of flowering plants to partly restore those wavelengths filtered out by greenhouse glass. In no tested plant did the supplementary ultraviolet radiation enhance floral anthocyanin content. Supplementary UV radiation has no economic value in greenhouse production of flowering plants.
Tables are presented for converting foot-candle readings to absolute energy units and for determination of the radiant energy of discrete wavelength bands present in light from natural and artificial sources.
Continuous fluorescent light did not shorten the induction period for anthocyanin synthesis in detached, green-mature ‘McIntosh’ apples, but after induction there was a proportionality between flux and synthesis. The optimum wavelength for anthocyanin synthesis is 440 nm; red light was additive. Ability of apples previously stored in air to synthesize anthocyanin under lights decreased sigmoidally with storage time; apples from controlled atmosphere (CA) storage showed no time-dependent decrease in synthetic ability but, if transferred to regular storage, they exhibited the same decline as did apples from regular storage. Cultivars differed in amounts of anthocyanin produced when illuminated. A fluorescent lamp for anthocyanin production in skins of mature, detached apples should emit a high intensity of blue and a low intensity of red radiation.