Phototechnology and Biological Experimentation

Jagger, John

doi:10.1007/978-1-4615-8058-4_1

Cited by 7 publications

(1 citation statement)

References 8 publications

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“…After exposure, cells were immediately exposed to a source of photoreactivating light for 60 min. Two Westinghouse 15W F15T8 black-light-blue (BLB) fluorescent lamps were initially used as the photoreactivating light source since they emit 97% of their radiation at wavelengths between 300 and 400 nm, with a peak wavelength occurring at 366 nm (5). Wavelengths below 300 nm were eliminated by use of a 6.4-mm-thick piece of window glass.…”

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confidence: 99%

Deoxyribonucleic acid repair capacities of Neisseria gonorrhoeae: absence of photoreactivation

Campbell¹,

Yasbin²

1979

J Bacteriol

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mentioning

confidence: 99%

Deoxyribonucleic acid repair capacities of Neisseria gonorrhoeae: absence of photoreactivation

Campbell¹,

Yasbin²

1979

J Bacteriol

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Analysis of Starch Accumulation and Germination in Onoclea Spores

Towill

1980

American J of Botany

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Previous studies have shown that low fluences of light accelerate starch accumulation and enhance germination of Onoclea spores. Fluence response curves for induction of starch accumulation were compared with fluence response curves for enhancement of germination in order to determine if the two photoresponses in Onoclea spores have a common photoreceptor. Fluence response curves indicate that both responses were proportional to the log of the fluence and that the relative fluence efficiencies of the four wavelength regions tested were similar for induction of both germination and starch accumulation. Red (600–720 nm) irradiation was the most efficient, while green (500–600 nm), blue (400–520 nm), and far‐red (720–900 nm) irradiations showed a decreasing order of efficiency for induction of the responses. A correlation coefficient between the amount of starch accumulated as a result of red irradiation and the final percent germination was calculated to be 0.964. These results support the hypothesis that a common photoreceptor mediates both photoinduced germination and starch accumulation. 3‐(3,4‐dichlorophenyl)‐1,1‐dimethylurea (DCMU) inhibits photosynthesis by blocking the flow of electrons from Photosystem II to Photosystem I. At 0.1 mM DCMU failed to inhibit both photoinduced starch acumulation and germination. This result and the greater efficiency of red than blue light, the low fluence functional for induction, and the fluence dependency argue against the participation of photosynthesis in photoinduced starch accumulation. A similar conclusion has been previously drawn for photoenhancement of Onoclea spore germination. Additionally, the effects 0.01–1.0 mm cycloheximide and 100 μl/l ethylene on photoinduced starch accumulation were investigated. Neither agent inhibited starch accumulation, whereas both substances inhibited germination 70–90% when applied at a time coincidental with the period of rapid starch accumulation. These results indicate that the photoinduction of starch accumulation does not have an ethylene sensitive stage nor does it require protein synthesis as does photoenhancement of germination of Onoclea spores.

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